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SmallHaul
01-26-2011, 05:27 PM
Well, since I have some pics to share it is time to start a thread for the Unit Hoe. All I have so far is the crane, drive chain & the drive gears. I ordered the chain for the tracks and the aluminum for the track pads. I also ordered some 200oz-inch metal gear servos that I am going to try to run the tracks. I still need to remove the cab from the frame.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/IMG_1433.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/IMG_1429.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/IMG_1432.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/IMG_1430.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/IMG_1431.jpg

1:1 for reference:

http://farm5.static.flickr.com/4096/4933244265_6397d3159e_z.jpg

tootall
01-26-2011, 06:38 PM
This is going to be a nice build. I going to watch this one

RCLogger
01-27-2011, 12:09 AM
Looks like a fun project, looking forward to watching this build. Servo city has the #25 sprockets that mount right on to servo's as well..

greg

Jared
01-27-2011, 01:09 AM
Great! Watching and waiting...

9W Monighan
01-27-2011, 10:27 AM
Are you making flat track pads or the "High Walker" version?

SmallHaul
01-27-2011, 11:09 AM
This is going to be a nice build. I going to watch this one

Thanks

Looks like a fun project, looking forward to watching this build. Servo city has the #25 sprockets that mount right on to servo's as well..

greg

Thanks Greg, that is a BIG help!

Great! Watching and waiting...

Thanks

Are you making flat track pads or the "High Walker" version?

Steve, I am going with the high walker version so that I can climb steep hills with it.

9W Monighan
01-27-2011, 12:26 PM
You may need a dozer with a winch too for the really steep hills. It could pull you up as the pipe line advances.

Stuff
01-28-2011, 11:55 AM
wow is this the same one or another Unit? LOL no pun in 10 did.

SmallHaul
01-28-2011, 12:21 PM
You may need a dozer with a winch too for the really steep hills. It could pull you up as the pipe line advances.

That would be cool.

wow is this the same one or another Unit? LOL no pun in 10 did.

No, this Unit is another unit.:p

pumptech
01-28-2011, 12:32 PM
Hey Smallhaul
Great idea for a build.:)
Looking forward to seeing this build.

Scalerlover
01-28-2011, 07:34 PM
Very cool, always thinking outside the box.

SmallHaul
01-28-2011, 08:03 PM
Hey Smallhaul
Great idea for a build.:)
Looking forward to seeing this build.

Thanks Pumptech!

Very cool, always thinking outside the box.

Thank You Scalerlover!

Well, I got the track chain today and I am very happy with the size & style. Still have lots of parts coming.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/hoetrackchain.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/hoetrackchain2.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/hoetrackchain3.jpg

tootall
01-28-2011, 08:10 PM
The track chain looks great. Where did you order from?

JAMMER
01-28-2011, 08:12 PM
Hello Scott I see things are really coming together for you glad to see it. You are moving along quite fast on it before long you will be digging ditches. Keep up the good work. Ed

SmallHaul
01-28-2011, 08:18 PM
The track chain looks great. Where did you order from?

Thanks, I got it from a local supplier but, just search for chain suppliers near you and then call them and ask for size 35 chain with K1 links every other link. They can order it for you because many places manufacture it.

Thanks Greg (RCLogger) for all the info on the chain!:D Greg, you have helped me so much on this build, I think you should name the Hoe.:)

SmallHaul
01-28-2011, 08:33 PM
Hello Scott I see things are really coming together for you glad to see it. You are moving along quite fast on it before long you will be digging ditches. Keep up the good work. Ed

Thanks Ed! It'll be quite a while before its digging. The more stuff I build, the more I realize that half the fun is building it and building it well. So, I'll take my time.:)

9W Monighan
01-28-2011, 09:15 PM
I was just thinking Scott, The new boom section on the drag; You should put some cold gun bluing on it rather than painting it black.
Those washers lined up on the tracks reminds me of an old Thew shovel or the BIG Bucyrus Shovels.

Stuff
01-28-2011, 11:10 PM
wow that looks awesome!! this one is gonna be a heck of a tracker!

Espeefan
01-29-2011, 03:15 AM
Hi Scott. I'm really looking forward to seeing this come together! It should be a really neat model, when done. I'm also looking forward to hearing your thoughts on the servo and chain drive. I've seen those goodies for sale online, and it's really easy to dream up all kinds of drives and uses for a continous rotation servo and the sprockets that fit them. It's pretty amazing. Stuff like that never used to be so readily available!

SmallHaul
01-29-2011, 08:15 AM
Thanks for the interest Nathan! I am really looking forward to building this to. I like the complexity of it. It will have gears, pulleys, sprockets, chains, cables, tracks & drums.:)

Dreamweaver
01-29-2011, 11:25 AM
Scott I think it's cool how you breath new life into the beloved toys we used to play with.

Who would have ever thought when we were on are knees making motor sounds with our mouths, that years later when we are to old and cramped up to get down on our knees, that we would still play with the same old toys in a whole new way.

Great work on all your "Restorations"

-Mike

tracksntreadslou
01-29-2011, 10:08 PM
Mike I think you sumed it up pretty good ...It also gives us a good excuse to play with our old toys and not look too foolish lol

SmallHaul
01-30-2011, 10:46 AM
Thank You very much Mike.

Thanks Lou.

I really enjoy converting them and never get tired of running them. :)

modelman
01-30-2011, 03:26 PM
SmallHaul-I will enjoy watching this build! These old machines are my main interest. Do you have any worries over the hi amp draw you will be putting on the servos for track drives? I didn't think servos would handle much continous load.

SmallHaul
01-30-2011, 03:42 PM
SmallHaul-I will enjoy watching this build! These old machines are my main interest. Do you have any worries over the hi amp draw you will be putting on the servos for track drives? I didn't think servos would handle much continous load.

Well, here is what I am thinking... The crowd drum on my doepke dragline has enough power to fairly easily pull the entire crane up hill on (free wheeling on its wheels) and that is one 200oz inch servo. So, I figure if I have one 200oz inch servo on each track that should be more than enough power to propel the entire crane up a steep hill. Worst case scenario is the 200oz inch servos are not strong enough and then I'll just have to swap them for Hitec 7955tg servos (well over 300oz inches of torque @ 6volts) that cost $100 a piece. I have one of these servos in my Mack dump truck running the dump mechanism and the servo has so much power that even if you overload the bed with dirt the servo doesn't even sound like it is working hard to lift & dump it.

Dreamweaver
01-30-2011, 03:58 PM
Well, here is what I am thinking... The crowd drum on my doepke dragline has enough power to fairly easily pull the entire crane up hill on (free wheeling on its wheels) and that is one 200oz inch servo. So, I figure if I have one 200oz inch servo on each track that should be more than enough power to propel the entire crane up a steep hill. Worst case scenario is the 200oz inch servos are not strong enough and then I'll just have to swap them for Hitec 7955tg servos (well over 300oz inches of torque @ 6volts) that cost $100 a piece. I have one of these servos in my Mack dump truck running the dump mechanism and the servo has so much power that even if you overload the bed with dirt the servo doesn't even sound like it is working hard to lift & dump it.


WOW... Scott speaks Greek:D:D:D Or at least that's what I am hearing.

SmallHaul
01-30-2011, 04:46 PM
WOW... Scott speaks Greek:D:D:D Or at least that's what I am hearing.

HA! Here is how much power one 200 oz inch servo has.:D

http://www.youtube.com/watch?v=RDJwvo3claI

9W Monighan
01-30-2011, 05:27 PM
That looks powerful enough Scott. You ought to put a ammeter in line to see how much current draw you have.

SmallHaul
01-30-2011, 07:50 PM
Do you have any worries over the hi amp draw you will be putting on the servos for track drives? I didn't think servos would handle much continous load.

Oops..sorry Modelman. the whole time I am thinking power not continuous load.:o

Thanks for the heads up Steve.:o

I'll check the current and post it up. But, I really don't think it will be enough to overheat the servo.

9W Monighan
01-30-2011, 08:15 PM
It's not like you'll be traveling any great distance. So the duty cycle would be down. Do a test on a junk one and try to kill it.

SmallHaul
01-30-2011, 08:25 PM
Well, metering the current under full load dragging the crane up the hill it is drawing .85 amps (850 milliamps). I was surprised, I thought it would have been a little over an amp. I then had the crane drag itself up and down the ramp about 20 times to see if the servo would get hot and it didn't. It barely got warm to the touch. So, the servos might be fine running the tracks but, only time will tell.

SmallHaul
01-30-2011, 08:33 PM
It's not like you'll be traveling any great distance. So the duty cycle would be down. Do a test on a junk one and try to kill it.

The servos I ordered for the drive are only $11.70 free shipping.
So, if they fail no biggie... They have all metal gears and over 200 oz of torque. From what I read the MG996R's hold up very well to abuse.

http://www.hobbypartz.com/servo-mg996r.html

Stuff
01-30-2011, 09:18 PM
11.70 each for 200oz servos!! **** man!!


also that video was awesome!!

SmallHaul
01-30-2011, 11:25 PM
11.70 each for 200oz servos!! **** man!!


also that video was awesome!!

Thanks Dean.

Also, every gear in that servo is metal and it is a digital servo as well. I will disassemble one when I get them and see how well they are made.

doodlebug
01-31-2011, 12:14 AM
Dragline Wheelie:D:D:D:D:p

Stuff
01-31-2011, 10:00 AM
this is what im getting http://www.servodatabase.com/servo/springrc/sm-s4315r
http://www.servodatabase.com/images/servos/springrc-sm-s4315r.jpg



Torque:
4.8V: 201.4 oz-in (14.50 kg-cm)
6.0V: 213.9 oz-in (15.40 kg-cm)

and are factory 360 robotic servos with J-channel connector. gotta watch some are a square 4 pin connector that i haven't seen before.

SmallHaul
01-31-2011, 05:57 PM
The bucket is made. It is not perfect but, it is the first time I ever brazed aluminum. I used the aluminum weld sticks from harbor freight. I sure learned a lot using it and will be able to do a much neater job the next time I use it. The ears at the back of the bucket will have holes drilled in them for mounting the rear pivot arm. I am surprised how heavy it is now that it is all welded together. I'll probably eventually make a another one out of thinner aluminum and make it neater.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/sides.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/sidessize.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/bendingbucket.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/bendingbucket2.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/bucketbottom.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/bucketside.jpg

SmallHaul
01-31-2011, 06:03 PM
This pic shows a better size comparison to the dragline bucket.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/buckets.jpg

JAMMER
01-31-2011, 06:40 PM
Scott that looks real good for the first time. Ed

SmallHaul
01-31-2011, 06:46 PM
Thanks Ed. Now I need to make some long nasty looking teeth for the front of it like the real ones have. :D

Stuff
02-01-2011, 12:26 AM
that turned out pretty good!

Dreamweaver
02-01-2011, 03:37 AM
Well hey Scott don't keep these aluminum brazing tricks to your self now...:eek::eek:

What sticks, any flux needed, ect, ect, ect.....

-Mike

SmallHaul
02-01-2011, 09:26 AM
that turned out pretty good!

Thanks Dean

Well hey Scott don't keep these aluminum brazing tricks to your self now...:eek::eek:

What sticks, any flux needed, ect, ect, ect.....

-Mike

I bought the rods at harbor freight and they are called Alumarod. Clean the aluminum with a wire brush and heat the aluminum up to over 750 degress and touch the rod to the hot aluminum and it flows on just like solder on a brass.

There are a couple of negatives though that I experienced when soldering aluminum. The Alumarod flows almost to thin and it flows down hill easily and pools. Also if you are brazing a very small item and you need to attach multiple pieces, every single piece must be secured to the main object until the heat dissipates from the entire object or it will fall apart. If I want to solder teeth on the front of the the bucket now I have to clamp the whole assembly so it doesn't fall apart or shift while heating it up. Now that I know this I would use metal pins to assemble the entire bucket and just solder the whole thing in one shot.
It was funny...the first time I used the rod I had the bucket clamped perfectly and had all of the joints soldered very cleanly and I went to flip the whole thing over to solder the bottom and when I picked it up the whole thing fell completely apart! DOH!!!! now I have a big mess! I had to clean up all the contact areas again and start over. So, the next time I soldered everything from the top and let it cool down and then flipped it over and heated it back up again to solder the bottom.

I was impressed with how well it works though. I would like to have a rectangular stick (the long beam the bucket attaches to) on the hoe and I might use the Alumarod to solder two U channel pieces together to make it.

Dreamweaver
02-01-2011, 10:16 AM
Thanks Dean



I bought the rods at harbor freight and they are called Alumarod. Clean the aluminum with a wire brush and heat the aluminum up to over 750 degress and touch the rod to the hot aluminum and it flows on just like solder on a brass.

There are a couple of negatives though that I experienced when soldering aluminum. The Alumarod flows almost to thin and it flows down hill easily and pools. Also if you are brazing a very small item and you need to attach multiple pieces, every single piece must be secured to the main object until the heat dissipates from the entire object or it will fall apart. If I want to solder teeth on the front of the the bucket now I have to clamp the whole assembly so it doesn't fall apart or shift while heating it up. Now that I know this I would use metal pins to assemble the entire bucket and just solder the whole thing in one shot.
It was funny...the first time I used the rod I had the bucket clamped perfectly and had all of the joints soldered very cleanly and I went to flip the whole thing over to solder the bottom and when I picked it up the whole thing fell completely apart! DOH!!!! now I have a big mess! I had to clean up all the contact areas again and start over. So, the next time I soldered everything from the top and let it cool down and then flipped it over and heated it back up again to solder the bottom.

I was impressed with how well it works though. I would like to have a rectangular stick (the long beam the bucket attaches to) on the hoe and I might use the Alumarod to solder two U channel pieces together to make it.


Cool thanks Scott.

Stuff
02-01-2011, 11:06 AM
wow that does sound tricky! what did you use for the heat? propane torch or go to oxy/acc torch?

RCTech9
02-01-2011, 12:51 PM
Bucket looks good.

SmallHaul
02-01-2011, 02:35 PM
wow that does sound tricky! what did you use for the heat? propane torch or go to oxy/acc torch?

A little map gas bottle with a hose & torch head.

Bucket looks good.

Thanks.

I used some scrap aluminum that I had laying around to jury rig a stick & boom to figure out the best length and pivot locations. Next I need to add the pulley at the top of the stick and the pulley down by the bucket because pulley the cable 1/1 is a little too fast and having twice the power will be nice. I have the servo rate turned down so that it doesn't move too fast setup directly... I'll probably use these dimensions on the final boom. It digs ok with this sloppy setup so, with teeth on the bucket and a bigger mouth opening (the stick is in the way on the jury rigged setup) it should dig very well.

http://www.youtube.com/watch?v=JXdtQ9FA-Xs

Stuff
02-01-2011, 02:57 PM
it looked to be doing okay as it was in the video lol. This is gonna be a heck of a project of yours!

the boom line, is it just one piece from the lower boom to the servo then back to the top of the boom?

RCTech9
02-01-2011, 03:04 PM
Nice video!!! Looking good!!!

JAMMER
02-01-2011, 03:42 PM
Scott you got it working real good and when you get the teeth on it will be working better because the dirt will stay in the bucket a lot longer and you will reach the truck before any dirt comes out. Ed:)

D8R
02-01-2011, 04:20 PM
Impressed! nice using servos for power and they are cheap, 11.70.
Did buy servos 2 weeks ago, thought they where cheap, Hitec HS-225MG at $32 each (at least cheap here in Sweden). Got to try to make a small servo powered model some day!
Saw that your servo source had servos with continuos rotation at 14 bucks, anyone tested those?
Dan

SmallHaul
02-01-2011, 04:36 PM
it looked to be doing okay as it was in the video lol. This is gonna be a heck of a project of yours!


the boom line, is it just one piece from the lower boom to the servo then back to the top of the boom?


It works ok but, it still needs some tweaking.

No, there are two drums (servo driven) one for the top line (called a hoist line) and one for the bottom line (called a crowd line) to the bucket.

Nice video!!! Looking good!!!

Thanks!

Scott you got it working real good and when you get the teeth on it will be working better because the dirt will stay in the bucket a lot longer and you will reach the truck before any dirt comes out. Ed:)

Thanks Ed! Agreed..:)

Impressed! nice using servos for power and they are cheap, 11.70.
Did buy servos 2 weeks ago, thought they where cheap, Hitec HS-225MG at $32 each (at least cheap here in Sweden). Got to try to make a small servo powered model some day!
Saw that your servo source had servos with continuos rotation at 14 bucks, anyone tested those?
Dan

Thanks Dan. The servos that are in this crane are HD-9150MG's that were about $40 a piece but, the ones I am using for the final version of the cable hoe have the same specs.

SmallHaul
02-01-2011, 06:42 PM
The pulleys are now added and they made a big difference in how the boom rises while digging. Now I need to figure out the second tower by the cab and how that is setup because I think that will help a lot when you reach the bucket all the way out and down.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/pulleysetup.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/pulleysetup2.jpg

9W Monighan
02-01-2011, 07:53 PM
Scott, I'll get you some images from a B-E book so you can get the geometry correct. That thing is working nice. Looks like the bucket will have to be cured more seeing the dirt falling out too soon. I have some of the small machines: 10,15,20,22,25B parts books to look at.

SmallHaul
02-01-2011, 08:09 PM
Scott, I'll get you some images from a B-E book so you can get the geometry correct. That thing is working nice. Looks like the bucket will have to be cured more seeing the dirt falling out too soon. I have some of the small machines: 10,15,20,22,25B parts books to look at.

Steve, I think the straight angle will be fine after the teeth are on there. Do you have any good pics or documentation of the pulley tower by the cab on a 22B Hoe? That is the part I can't figure out how that is set up. It is just a single loop of steel with pulleys on top so, the cable setup must keep the tower in position?:confused:

SmallHaul
02-01-2011, 08:12 PM
Here it is loading the Mack with the new pulley setup. It lifts the load much better with the pulleys setup like the 1:1 unit.


http://www.youtube.com/watch?v=syd2XaANbuU

RCTech9
02-01-2011, 09:27 PM
Yet another nice video!!! I think you should just paint the Boom/stick and call that part done L0L.

steamer
02-01-2011, 09:38 PM
Your a pro at these conversions. I tried Albert's Cat skid steer on the weekend and it is a thing of beauty. What next, do you have up your sleeve.
Rob

SmallHaul
02-01-2011, 09:49 PM
Yet another nice video!!! I think you should just paint the Boom/stick and call that part done L0L.

Thanks! I gotta make a nicer boom and stick though.:D

Your a pro at these conversions. I tried Albert's Cat skid steer on the weekend and it is a thing of beauty. What next, do you have up your sleeve.
Rob

Thank you very much Rob. I am happy to hear you enjoyed the delta loader! I actually don't have any future projects in the works.

Jared
02-01-2011, 11:28 PM
It is just a single loop of steel with pulleys on top so, the cable setup must keep the tower in position?:confused:

That's called the jack boom. The boom hoist holds it from flopping forward and the weight of the boom/stick keeps it from flopping backward. The boom hoist has about a four-part line. Then when you're digging deeper you lean it forward a little and when you're digging shallower you lean it back a little as needed. i think there are usually three or four sheaves on it. Two on the outside for the boom hoist and one in the middle between the uprights if using a two part line to the top of the stick or two in the middle if using a three-part line. I would recommend finding an old copy of "Moving the Earth". Among other things, there are good explanations of revolving shovels and the various attachments.

http://cgi.ebay.com/MOVING-EARTH-WORKBOOK-EXCAVATION-Nichols-1955-/390245592518?pt=US_Nonfiction_Book&hash=item5adc732dc6
This is close to the one my dad has, which I think is a '60's vintage. I don't know if the later editions have as much cable machine stuff. It ain't cheap but it's worth it! Every kind of earthmoving machine is covered.

Looking good!. I know this is more of a proof-of-concept thing so maybe you've already considered this, but splitting the end of the stick into a "Y" and attaching each leg of the Y to the bucket would help the bucket fill rather than dirt piling up against the end of the stick.

Jared
02-02-2011, 12:21 AM
Here's a reeving diagram that's not very good. It may raise more questions than it answers.

http://www.tpub.com/content/constructioncranes/TM-5-3810-201-12/TM-5-3810-201-120049.htm

http://www.tpub.com/content/constructioncranes/TM-5-3810-201-12/TM-5-3810-201-120050.htm

Actually the picture of the 1:1 in the very first post isn't too bad for showing how it's done- if you know what you're looking at :D

Lil Giants
02-02-2011, 03:40 AM
Very fluent motion & smooth operating skill makes it exciting to watch Scott. Well done!

And great tutorial on aluminum welding. Is mapp gas hotter or colder than acetylene? Is it better to use mapp gas or is it just more convenient?

SmallHaul
02-02-2011, 09:49 AM
Jared, Thank You so much far all the info! I think I understand all of the cabling now after looking at the first diagram.

http://www.tpub.com/content/constructioncranes/TM-5-3810-201-12/TM-5-3810-201-120049im.jpg

The only problem is the routing of the cables are compounded 2 times which would reduce the drum speed twice and that would slow everything down too much. In my second video loading the Mack truck with the pulleys added the cables are compounded once (cutting the speed in half) and the digging speed is just right. So, I'll just have to setup the jack boom a little differently on the model.

Joe, thank you very much.

Map gas burns a lot hotter than butane or propane and when brazing aluminum it sucks the heat up real bad as you can imagine. Even using Map gas it took a while to heat the hoe bucket up enough to flow the alumarod.

9W Monighan
02-02-2011, 10:28 AM
Scott I'll be sending you an email with several pages from a 22RB operator book. And several photos from a 10B 14B 15B parts books. I need your email.

SmallHaul
02-02-2011, 11:28 AM
Steve, that would be great. PM sent.

SmallHaul
02-02-2011, 01:11 PM
Steve, the pics you sent me look great. Thank You.

I was going to start making a nice looking boom & stick next but, I am going to make up the Jack/Auxiliary boom first and get that working properly. The more I look at all the info I can see why the hoist drum cable is compounded 3 times...it is because the pulley at the top of the stick is so close to the pivot point you need 3 times the power to pull it up and it will rise 3 times as fast because it is so close to the pivot point. But....when I tried moving the pulley attachment closer to the pivot point it made it much harder for the stick to extend all the way? It could be the fact that I am running it without a Jack boom (hoist cable too low of an angle) that is causing the extension problem. I'll keep experimenting.

9W Monighan
02-02-2011, 02:33 PM
more pictures on the way Scott

Stuff
02-02-2011, 03:28 PM
wow now thats going to a whole new level Scott!

for the reduced speed in the pictures there the left hand aux gantry sheave to right hand aux gantry sheave could be hooked up omitting the bottom left hand gantry sheave and that should give you more speed?

SmallHaul
02-02-2011, 05:26 PM
wow now thats going to a whole new level Scott!

for the reduced speed in the pictures there the left hand aux gantry sheave to right hand aux gantry sheave could be hooked up omitting the bottom left hand gantry sheave and that should give you more speed?

If you look at the 1:1 Unit Hoe in the first post it looks like it only loops back on itself once so, I'll probably do that.

I have the Jack boom setup and it works nice. It is not exactly like the Unit Hoe setup but, its close. After I Get the pics from Neil (Doodlebug) I can make it right.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/cables.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/Jackboomsetup.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/jackboomsetup2.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/jackboomsetup3.jpg

Finster
02-02-2011, 06:14 PM
After watching the video I think you test of the boom was a big success. I think it works great! Well done! Since people are sending you BE info I thought that this video might help as well.

http://www.youtube.com/watch?v=1rlBuDefgog

SmallHaul
02-02-2011, 06:44 PM
Thanks Finster, that is a good video of an old Hoe.

Here is a quick video of the Jack Boom moving:

http://www.youtube.com/watch?v=ZHwxtKFnJD8

And loading a truck on flat ground:

http://www.youtube.com/watch?v=Ovh1vyhqPBk

9W Monighan
02-02-2011, 06:58 PM
Looks like you have it. I wish the freakin youtube vids would download faster! There must be something wrong because It takes way too long to buffer. I even have a fiber optic line to my shop for internet and takes way longer than the actual video run time.
Sorry to change the subject Scott.

Jared
02-02-2011, 08:25 PM
Looks like you pretty much nailed it on the jack boom, Scott. After seeing that last video I'm turning green with envy.

Once you get that thing perfected you can move on to this: :D
http://www.constructionequipment.com/article/koerhings-answer-wheel-loaders

W900snowman
02-02-2011, 08:52 PM
Awesome addition to your fleet can't wait to see the finished product. Everyone on here is a very bad influence for me I with all these impressive models. Very nice Scott I'm really looking forward to seeing the undercarriage on this one.

Two Thumbs Up!!

SmallHaul
02-02-2011, 09:29 PM
Looks like you have it.

Thanks Steve for all the pics and documentation.

Looks like you pretty much nailed it on the jack boom, Scott. After seeing that last video I'm turning green with envy.

Once you get that thing perfected you can move on to this: :D
http://www.constructionequipment.com/article/koerhings-answer-wheel-loaders

Thanks Jared. Hmm...must stay focused...:D

Awesome addition to your fleet can't wait to see the finished product. Everyone on here is a very bad influence for me I with all these impressive models. Very nice Scott I'm really looking forward to seeing the undercarriage on this one.

Two Thumbs Up!!

Thank You very much. I am looking forward to building it when more parts arrive.:)

doodlebug
02-02-2011, 11:22 PM
Now I'm gonna scare you! I know where one is sitting! (Koehring skooper).
It's up by Rio Tinto's Kennecott Copper Mine in Utah. Yah Mike, possible road trip!
Later, Neil#2 aka doodlebug.

Papy
02-03-2011, 01:30 AM
Another solution : the jack boom is attached rigid to the A-frame.

http://i78.servimg.com/u/f78/12/58/20/29/p1000210.jpg (http://www.servimg.com/image_preview.php?i=76&u=12582029)

SmallHaul
02-03-2011, 08:25 AM
Now I'm gonna scare you! I know where one is sitting! (Koehring skooper).
It's up by Rio Tinto's Kennecott Copper Mine in Utah. Yah Mike, possible road trip!
Later, Neil#2 aka doodlebug.

It would be cool to see pics of it someday.:)

Another solution : the jack boom is attached rigid to the A-frame.

http://i78.servimg.com/u/f78/12/58/20/29/p1000210.jpg (http://www.servimg.com/image_preview.php?i=76&u=12582029)

Very unique looking machine.

Stuff
02-03-2011, 09:59 AM
man you have been busy!

that is just a maze of cables to me now lol

Papy
02-03-2011, 10:13 AM
......Very unique looking machine.

Not easy to load with this central sprocket design, but there's not a lot of these left, so it was worth saving it ;)

By the way, it was fun to carry it back home....

http://i78.servimg.com/u/f78/12/58/20/29/p1000211.jpg (http://www.servimg.com/image_preview.php?i=77&u=12582029)

Stuff
02-03-2011, 10:43 AM
why is it i see that rig and then the radio starts playing deep purple - highway star? lol

good to see you saved some old iron!

modelman
02-03-2011, 11:30 AM
SmallHaul-looking very good!! And also, you work really fast!!

SmallHaul
02-03-2011, 11:56 AM
man you have been busy!

that is just a maze of cables to me now lol

It is not too bad if you just route one line at a time.:)

Not easy to load with this central sprocket design, but there's not a lot of these left, so it was worth saving it ;)

By the way, it was fun to carry it back home....

http://i78.servimg.com/u/f78/12/58/20/29/p1000211.jpg (http://www.servimg.com/image_preview.php?i=77&u=12582029)

Papy, can you make a thread for this in the 1:1 equipment forum and post some detailed pics when you get a chance? Cool machine.

SmallHaul-looking very good!! And also, you work really fast!!

Thanks! Now I can start on the final stick & boom.

td9clyde
02-03-2011, 12:44 PM
nice job so keep up the awsome work that thing is a cute lil bugger lol be neat to watch it work

dirtpusher9
02-04-2011, 07:49 AM
Scott, you do a great job on these. Looks like it's got plenty of power too.

SmallHaul
02-04-2011, 09:11 AM
nice job so keep up the awsome work that thing is a cute lil bugger lol be neat to watch it work

Thanks Henry!

Scott, you do a great job on these. Looks like it's got plenty of power too.

Thanks Joe!

I got the drive sprockets yesterday so, now I'll start building the undercarriage.

SmallHaul
02-04-2011, 09:16 AM
Oops.. forgot to add a link to a vid of it loading two trucks.

http://www.youtube.com/watch?v=bLbSpTaTekY

Dreamweaver
02-04-2011, 05:35 PM
Scott this is working better every day..

Where do you find all these old toys?

-MIke

SmallHaul
02-04-2011, 05:45 PM
Scott this is working better every day..

Where do you find all these old toys?

-MIke

Thanks Mike, I buy most of them from ebay.

I got the drive sprockets so, I made the drive axles today.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/driveaxlesprockets.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/driveaxles2.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/driveaxles1.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/drivechain.jpg

Stuff
02-04-2011, 09:14 PM
ooooooooooooohhhhhhooooooooooooooooo looks purdy!

doodlebug
02-06-2011, 01:01 AM
Hey Scott, send me a pm, I have a bunch of picture's to send with measurement's. Can't scan the borrowed literature until I replace my computer, gone senile! .NetFramework is eating my lunch.
Later, Neil#2 aka doodlebug.

SmallHaul
02-06-2011, 01:38 AM
ooooooooooooohhhhhhooooooooooooooooo looks purdy!

:D

Hey Scott, send me a pm, I have a bunch of picture's to send with measurement's. Can't scan the borrowed literature until I replace my computer, gone senile! .NetFramework is eating my lunch.
Later, Neil#2 aka doodlebug.

PM sent. Thanks Neil!

SmallHaul
02-06-2011, 10:43 AM
Neil, thank you so much the pictures are great!

One thing that bothered me about my model is that I couldn't extend the bucket all the way out if i wanted to and all full scale cable backhoes seem to be able to? And now after seeing your pic I realize what is wrong...the top pulley arm mount pivots just like the bucket pulley arm, I have mine solid mounted... Doh! :)

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/unit3.jpg

The other thing that I didn't like about my model was that the top (hoist) cable lifts out of the pulley when you raise the boom too high and after looking at your picture I see that the full scale Unit has a small drum on top of the auxiliary boom that keeps the cable from raising up! :cool:

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/unit13.jpg

Thanks Neil! Two thumbs up! :D

Stuff
02-06-2011, 12:43 PM
nice pictures! this is gonna be an extra circular project now? lol

doodlebug
02-06-2011, 08:39 PM
Hey Scott glad to help, let me know if you need different angle's or better lighting, LOL!
Ordered a new computer today, hope to have the lit. scanned later next week.
Later, Neil#2 aka doodlebug.

Stuff
02-07-2011, 12:21 PM
found some pictures and videos. might have seen them already. one video is kinda scary...

Scary video of guy unloading a Unit Crane tracked
http://www.youtube.com/watch?v=83tSiHyAQ5A

Clam shell in action
http://www.youtube.com/watch?v=CZUR9iPPTgc

Unit crane model on a truck
http://www.doepketoy.com/?tag=doepke-unit-crane

Several configurations, from crane to bucket to excavator
http://www.doepketoy.com/?tag=unit-crane

More links
http://www.constructioncollector.com/editorial-Unit.html
http://www.ccmodels.com/closed-cranes-unit-CableHoe.html
http://www.gerhartmachinery.com/equipment/draglines-cranes/unit/unit-wagon-crane-model-617-sn65186/
http://www.bigoldiron.com/cranes.html

also some classic toy parts
http://store.classictintoy.com/mm5/merchant.mvc?Screen=SFNT&Store_Code=CTTC
http://thomastoysantiquetoyparts.com/

td9clyde
02-07-2011, 02:03 PM
i like this build going to be interesting can't wait to see it all together and working........................i thought i was into the old stuff like 1960's but SmallHaul , you got me beat lol on the old style equipment models

D8R
02-07-2011, 03:56 PM
Nice with those chains, got to remember that if I build a suitable model.
Papy, nice truck, is it from France?
Dan

Papy
02-07-2011, 05:04 PM
...Papy, nice truck, is it from France?
Dan

Switzerland.....but you were not so far, because it's based just in the neighborhood of the french border.

As SmallHaul suggested, I opened a dedicated thread, so you get more of the story here (http://173.201.47.108/showthread.php?t=1382)

SmallHaul
02-07-2011, 05:27 PM
i like this build going to be interesting can't wait to see it all together and working........................i thought i was into the old stuff like 1960's but SmallHaul , you got me beat lol on the old style equipment models

Thanks Henry, I really like how complex these old machines are. The more I learn about them the more I realize how much engineering goes into one.

Hey Scott glad to help, let me know if you need different angle's or better lighting, LOL!
Ordered a new computer today, hope to have the lit. scanned later next week.
Later, Neil#2 aka doodlebug.

Neil, I just got a 1950's Unit repair manual that has great photos and documentation but, there are no measurements at all... so, all the measurements you took were very helpful. I calculated all of your numbers to 1/16 scale and my prototype boom & stick are a little over sized but, not by much. When you get the cab roof to floor measurement We'll see how close the Doepke toy actually is to 1/16.

found some pictures and videos. might have seen them already. one video is kinda scary...

Thanks for the links Dean.:)

Nice with those chains, got to remember that if I build a suitable model.
Dan

Thanks Dan, I decided to make the rotate chain drive too, using #25 chain. It will be easy to setup and it should be very reliable. I just ordered the sprockets for the rotate setup today.

doodlebug
02-07-2011, 08:47 PM
Hey Scott, bottom of "house" to top of cab is 6' 11 1/4" high, or 9' 10'' from the ground. Track's are 2' 4 1/4'' high,
not the version you're building. Ground to bottom of house 2' 10 1/4'' Track length 10' 1'' or 10' 10'' high flotation version. Track shoe width, 16'', 20'', or 22'' long track version-flotation. Width of track's outside, 8' 0'', 8' 8'', 9' 0''. House is 8' 0'' wide.
Hope this help's. Later, Neil#2 aka doodlebug.

SmallHaul
02-07-2011, 09:03 PM
Neil,

The Doepke Cab is 5 inches tall so, times 16 it would be 80" and Your measurement is 83 1/4". The width of the body is 6 inches and times 16 is 96" perfect to your 8 feet wide. So, it is accurate to 1/16 scale. Now I'll make the prototype boom match your numbers and make sure I am happy with how it digs.

Thanks Neil!

doodlebug
02-07-2011, 09:07 PM
Hey Scott, do you need the "arch on the boom"? Let me know!
Later, Neil#2 aka doodlebug

SmallHaul
02-07-2011, 09:16 PM
Hey Scott, do you need the "arch on the boom"? Let me know!
Later, Neil#2 aka doodlebug

Yes, if you can that would be great! I ordered 1/2 inch square tube for the boom and stick because after looking at the boom in the Unit 357 maintenance manual it looks to be about right. Did you measure the width and length (not counting the teeth) of the bucket? I wonder how far off mine is.

ihbuilder
02-07-2011, 10:02 PM
Scott , you OK for the boom now ? My guy didn't get back to me yet :mad: ( typical :rolleyes: ) I think I'll be going elsewhere in the future . your doing a good job .

IHSteve

SmallHaul
02-07-2011, 10:59 PM
Scott , you OK for the boom now ? My guy didn't get back to me yet :mad: ( typical :rolleyes: ) I think I'll be going elsewhere in the future . your doing a good job .

IHSteve

Steve, I think the 1/2" square tube is gonna be fine. Thanks for trying.:)

doodlebug
02-08-2011, 01:48 AM
Hey Scott, I'll go by tomorrow LOL. Just got off night shift, the contractor forgot to cancel dump truck's tonight. Got 2 hour's for showing up!
Later, Neil#2 aka doodlebug

doodlebug
02-08-2011, 08:20 PM
Hey Scott, the bucket is 24'', 3 teeth. The dipper end of the boom, to the center of "arch'' is approx 10' 1'' from the pin (dipper arm) the the fork/drag pulley area (picture #1)
The boom is 21 1/2" wide, 10" tall, the gap in the forked end is 11 1/8''.
The arch in the boom is 22'-23' degree's.

Later, Neil#2 aka doodlebug

SmallHaul
02-08-2011, 08:43 PM
Wow, the bucket is only 24" wide? That is only 1 1/2 inches in 1/16 scale. The bucket I made is 2 inches wide and looks about right.

Thanks for the measurements Neil, I went through all of your numbers today and set the hoe up with your measurements. It works and digs great set to scale size. I packed some dirt hard and added water to make it thick & heavy, loaded one of the Tonkas and it did very well. It should really dig well when I get teeth on the bucket.

doodlebug
02-09-2011, 11:52 AM
Hey Scott, now you know why the bucket has side board's on it.
Later, Neil#2 aka doodlebug

Stuff
02-09-2011, 07:39 PM
lol. cant go wider, then go higher! :D

RCTech9
02-20-2011, 04:46 PM
Any updates Scott?

SmallHaul
02-20-2011, 06:08 PM
Any updates Scott?

Not much new really. Ordering & quality of parts is causing delays. I ordered the servo city sprockets that have the servo splines built in and they don't work at all because they are made wrong...when the chain wraps around the sprocket it grabs the chain and won't let go. They were supposed to send me "better" replacement sprockets a week ago and they never showed. I'll call Monday and talk to management there...:mad: So, I took 9 tooth metal sprockets and modified it to work on a servo. They run very smoothly and don't grab the sprocket at all. I'll probably make some progress on it this week though.

9W Monighan
02-20-2011, 06:59 PM
Maybe the small diameter is causing the grabbing. Anything smaller than 12t is not recommended at certain speeds but for your intermittent use you should be ok. Did you grind the teeth open some?

SmallHaul
02-20-2011, 07:28 PM
Maybe the small diameter is causing the grabbing. Anything smaller than 12t is not recommended at certain speeds but for your intermittent use you should be ok. Did you grind the teeth open some?

The servo city sprockets are 10 tooth and the metal sprockets that I modified are 9 tooth and work great. The metal 9 tooth sprockets work so smoothly that I can drape an 8 inch loop of chain over it and run it just hanging there and it runs the chain fine, never grabs at all... The servo city sprockets have tall square teeth and I think that is the problem.

http://www.servocity.com/assets/images/Hitec_250_Servo_Sprocket.jpg

SmallHaul
02-20-2011, 08:17 PM
I made a quick vid of the chain drive working. I'll have to make a jig for drilling the track pads because the few that I made aren't consistent enough for my liking.

http://www.youtube.com/watch?v=8Lj4c_IDNAI

fhhhstix
02-20-2011, 08:55 PM
Looks like you have made some good progress Scott keep up the great work.

Travis

doodlebug
02-21-2011, 12:38 AM
Hey Scott, Jig's are alway's nice to have for repetition. Sure helped when I was running an iron worker 25 year's ago. Later, Neil#2 aka doodlebug.

SmallHaul
02-21-2011, 11:18 AM
Thanks Travis!

Agreed Neil.:)

Well, I called Servo City and they were very helpful. Turns out the #25 chain I am using has a smaller roller diameter (.120) than they use (.127) which would explain why my chain binds up when you wrap it around more than 100 degrees or so. They are sending me some of there #25 chain to rectify this. That is really good customer service! Even most good companies would say just send the parts back for a refund but, these guys want people to get there projects running.:)

modelman
02-21-2011, 12:42 PM
SmallHaul-I used the servo city sprockets on my shovel and they worked great but I did also use their chain so I guess that explains the problem you had. Their servo sprockets were the only ones I could find that were small enough to get the ratio correct. Enjoying watching this build.

D8R
02-21-2011, 01:17 PM
Nice solutions on the drive. Wish I built smaller so servo could be used. Maybee some day....
Servo city, is that a supplier??
Dan

SmallHaul
02-21-2011, 06:24 PM
SmallHaul-I used the servo city sprockets on my shovel and they worked great but I did also use their chain so I guess that explains the problem you had. Their servo sprockets were the only ones I could find that were small enough to get the ratio correct. Enjoying watching this build.

Thanks Modelman, I believe there chain will fix it.

Nice solutions on the drive. Wish I built smaller so servo could be used. Maybee some day....
Servo city, is that a supplier??
Dan

I only used the servos because the hoe is small & light (probably less than 6 lbs when complete). If I had the room and needed more power I would use a 200:1 geared motor on each track and esc's. But, I am making the undercarriage all one rc unit...meaning there will be a (4 cell 500mah) battery pack and a separate receiver just to run the drive. That way there is no electrical connection between the crane/house and the undercarriage.

Yes, Servo City has some nice unique servo related items that you can't get/find anywhere else. Adapters, sprockets, reduction units, aluminum arms...

RCLogger
02-23-2011, 12:17 AM
Looks very good Scott, you will have more than enough power there. Do you need a speed control , as the servo has it already ?

greg

SmallHaul
02-23-2011, 07:12 AM
Thanks Greg.

You are correct there are no esc's needed, all of the servos just plug into the receiver. The undercarriage electronics will consist of 2 servos, one receiver and a battery. The cranes main electronics will consist of 4 servos, one receiver and a battery.

SmallHaul
02-23-2011, 04:17 PM
Well, since I am waiting for parts to build the undercarriage I made a large bucket so that I could load trucks faster at the meets when we use ground up rubber.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/HoeBuckets.jpg

Its really too big for actual dirt but, I had to load the Mack up a couple of times just for the fun of it.

http://www.youtube.com/watch?v=xtjl5kGhRhc

modelman
02-23-2011, 07:38 PM
SmallHaul-looks to my like it handles that bigger bucket pretty good!

Roadmasters
02-23-2011, 10:31 PM
I like the quick change system on the backet. Cant wait for more!

Stuff
02-23-2011, 11:28 PM
hehe one for show and one for GO GO GO! lol

SmallHaul
02-24-2011, 09:19 AM
SmallHaul-looks to my like it handles that bigger bucket pretty good!

It is fun to use the large bucket because it forces you to operate it more efficiently. If you just reach out over the pile and drag the bucket all the way back and lift it out of the dirt the crane really stresses to lift the bucket but, if you smoothly lift the bucket just as it is filling up, the crane lifts it well.

I like the quick change system on the backet. Cant wait for more!

Thanks.

hehe one for show and one for GO GO GO! lol

:) Yep, it seems like we can never load all the dump trucks fast enough at the meets.

ihbuilder
02-24-2011, 12:18 PM
It is fun to use the large bucket because it forces you to operate it more efficiently. If you just reach out over the pile and drag the bucket all the way back and lift it out of the dirt the crane really stresses to lift the bucket but, if you smoothly lift the bucket just as it is filling up, the crane lifts it well.



Thanks.



:) Yep, it seems like we can never load all the dump trucks fast enough at the meets.

Well you will take awhile to load the 1 I'm building now :p:) It'll take Steve's drag to load it :rolleyes: With the big bucket :D

the hoe works nice Scott :cool:

IHSteve

SmallHaul
05-04-2011, 05:54 PM
Well, I pulled this project back out and started working on it again. I am hoping to make the National Pike show and would like to have this finished for it (May 21st). The chain drive works nice and has plenty of power. It is going to be cool to get the chain rotate setup, it should work smoothly.

Here is a video of it working:

http://www.youtube.com/watch?v=ft1fAnn2sIA

steamer
05-04-2011, 07:44 PM
Scott. The car body works very nice. When the upper is on there and you have cleats you should be able to go anywhere. I'm surprised at the power the servos have.
Rob

SmallHaul
05-04-2011, 08:11 PM
Scott. The car body works very nice. When the upper is on there and you have cleats you should be able to go anywhere. I'm surprised at the power the servos have.
Rob

Thanks Rob, I am a little surprised my self at how much power it has. I also dragged a 10 pound steel weight with it and it pulled it just fine.

9W Monighan
05-05-2011, 11:40 AM
That's a cool little robot in it's self:eek:. That won't have any trouble traveling up a pile of dirt. Definitely the "High Walker" version. You'll be able to do pipeline up mountains!

JensR
05-06-2011, 01:35 PM
What a neat project!
ServoCity are great, I use their adapters, too.
Haven't had a chance to check their chain - good idea.
I assume this is the plastic chain here:
http://www.servocity.com/html/chain.html

SmallHaul
05-06-2011, 05:43 PM
What a neat project!
ServoCity are great, I use their adapters, too.
Haven't had a chance to check their chain - good idea.
I assume this is the plastic chain here:
http://www.servocity.com/html/chain.html

Thanks. Yes, that is the chain but, it is not plastic it is steel. The entire drive train is metal except the servo cases.

I couldn't get their servo splined sprockets to work though. They were very helpful trying to help me (GREAT customer support) but, every sprocket they sent me grabbed the chain badly. The only way there sprockets would work smoothly is if the chain only wraps around a small portion of the sprocket. I said to them "simply wrap the chain around the sprocket and you will see that it is STUCK on there" and they just ignore the comment... the standard $3 sprockets I ordered from a discount chain work fine.:rolleyes:

JensR
05-06-2011, 06:12 PM
Ah, sorry, I was confused! Need to learn to read :D
Their plastic chain has a spacing of 0.1227, so I thought you meant this.

""""
Turns out the #25 chain I am using has a smaller roller diameter (.120) than they use (.127) which would explain why my chain binds up when you wrap it around more than 100 degrees or so. They are sending me some of there #25 chain to rectify this.
""""

But what you wrote is that it's the diameter of the rollers that is different. Never heard that before.
However, using a chain with smaller roller diameter on a sprocket designed for a larger diameter should work, I would guess. (Never tried it, though.)

Thanks for the heads-up, will have to remember this...

SmallHaul
05-11-2011, 09:56 PM
Got a little more done. The chain drive for the rotates is finished. I maybe over engineered it but, I wanted it to be strong so that I could push dirt sideways with the bucket on occasion and not worry about anything breaking.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/bearingschain.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/IMG_1972.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/IMG_1978.jpg

SmallHaul
05-11-2011, 10:39 PM
Short vid of it in action:

http://www.youtube.com/watch?v=2tYFjqwk45g

TheMachinist
05-11-2011, 11:39 PM
This may be a silly question but what are the black wire leads going into the track frames? Are the drive batteries between the rails?
It sure works well on rotation and looks to have a good speed on the tracks:cool:

doodlebug
05-12-2011, 06:36 AM
Hey Scott, run's great! Any luck on the new cable exc. boom?
Later, Neil#2 aka doodlebug.

SmallHaul
05-12-2011, 09:27 AM
This may be a silly question but what are the black wire leads going into the track frames? Are the drive batteries between the rails?
It sure works well on rotation and looks to have a good speed on the tracks:cool:

Thanks, Yes you are correct the black wires are for the batteries. There are 4 AAA 650mah NiMH batteries powering the drive, 2 on each side of the track body.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/IMG_1980.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/IMG_1981.jpg



Hey Scott, run's great! Any luck on the new cable exc. boom?
Later, Neil#2 aka doodlebug.

Thanks Neil, haven't worked on a new boom yet. It will probably be a while until I get to it. Once the weather turns nice I don't spend much time working in the basement.

9W Monighan
05-12-2011, 09:29 AM
Nice work Scott. I see you went to chain drive on the slewing ring. How come you didn't go with a gear like your dragline?

SmallHaul
05-12-2011, 09:39 AM
Nice work Scott. I see you went to chain drive on the slewing ring. How come you didn't go with a gear like your dragline?

Thanks Steve. When running the cable hoe you can run the side of the bucket into a truck or dirt pile and put a lot of stress on the rotate mechanism so, I wanted it to be very strong and reliable. The setup on the dragline works great but, it only has to move the boom back and forth and never gets struck or jolted hard.

kerst
05-12-2011, 10:02 AM
Nice project!

kerst

steamer
05-12-2011, 10:20 AM
Hey Scott. I thought that maybe those wires were for track heaters, so you could work in the snow.
Rob

SmallHaul
05-12-2011, 02:41 PM
Nice project!

kerst

Thank You!

Hey Scott. I thought that maybe those wires were for track heaters, so you could work in the snow.
Rob

HA! Boy that would drain the batteries quick Rob!:D

ihbuilder
05-12-2011, 04:06 PM
Hey Scott. I thought that maybe those wires were for track heaters, so you could work in the snow.
Rob

thats a good 1 rob , I like it :D

:cool: looks great Scott , you can bring it up here when your ready to test it :D I got plenty of obstacles :p

SmallHaul
05-12-2011, 09:23 PM
thats a good 1 rob , I like it :D

:cool: looks great Scott , you can bring it up here when your ready to test it :D I got plenty of obstacles :p

Thanks Steve, I hope to have it finished soon.

SmallHaul
05-13-2011, 06:08 PM
The track pads are done. It runs nice and has a lot of traction with the pads on. I ran it around my basement for about 30 minutes and the tracks batteries (4 cell NiMH AAA pack) still had over 5 volts in it so, the batteries should last all day on one charge because the tracks aren't used much.

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/Cleats2.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/Cleats4.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/Tonka%20Dump%20trucks/Cleats5.jpg

russisloud
05-13-2011, 09:11 PM
hey scott, where do you find the chain your using for your track? i've been looking for some, but i'm really not sure what to look for.

SmallHaul
05-13-2011, 09:32 PM
hey scott, where do you find the chain your using for your track? i've been looking for some, but i'm really not sure what to look for.

Russ, I got the chain from a local bearing & chain supplier. It is #35 chain with K1 links on every other link. The (smaller) drive chain is #25 chain that is the same size that is used on a lot of the rc motorcycles.

trucker n
05-13-2011, 10:42 PM
i have a question where did you get the aluminum for the track pads

Stuff
05-14-2011, 12:05 AM
looking good man!! my replacement servos arrived the other day so i hope to get mine going now to lol.

SmallHaul
05-14-2011, 08:18 AM
i have a question where did you get the aluminum for the track pads

This is the web site http://www.eaglemouldingsinc.com/ and these are the choices http://eaglemouldingsinc.com/BarFaceNosing.aspx

looking good man!! my replacement servos arrived the other day so i hope to get mine going now to lol.

Thanks:)

JAMMER
05-14-2011, 04:42 PM
Scott very nice job on the tracks but I still think they are to short but it's yours and if your happy that all that counts. Ed

SmallHaul
05-14-2011, 05:28 PM
Scott very nice job on the tracks but I still think they are to short but it's yours and if your happy that all that counts. Ed

Thanks Ed. The tracks length (where it actually touches the ground) is about the same as the width (7 inches) so, if it is too short it is also too narrow... which I don't believe it is. We'll know soon enough though when I dig with the oversized bucket.

SmallHaul
05-23-2011, 04:57 PM
Due to all the rain we have been having I didn't make the National pike show but, I got a lot of work done on the Cable Hoe. Here are a couple of videos of it running.

http://www.youtube.com/watch?v=FDNg-lWYWdA

http://www.youtube.com/watch?v=eO1HTfixDI4

9W Monighan
05-23-2011, 05:23 PM
That turned out really nice Scott. Are you going to add some rollers on the bottom of the track frames too?

What rain? I put about 14hrs total on the 9W this weekend. 8hrs almost nonstop Saturday. I even dug at night for an hour Saturday evening.
Sunday morning it rained for an hour or so but I had it tarped down and dug as soon as the sun came out again I dug for about 5hrs more.

SmallHaul
05-23-2011, 05:33 PM
That turned out really nice Scott. Are you going to add some rollers on the bottom of the track frames too?

What rain? I put about 14hrs total on the 9W this weekend. 8hrs almost nonstop Saturday. I even dug at night for an hour Saturday evening.
Sunday morning it rained for an hour or so but I had it tarped down and dug as soon as the sun came out again I dug for about 5hrs more.

Thanks Steve. Yes, I still have to add rollers/slides on the top and bottom. I am keeping my eyes out for some black delrin to make them out of. Because of the roller style chain they need to be slides that I will make look like rollers.

That is great that the weather turned out ok for the show. I am looking forward to the August show.

doodlebug
05-23-2011, 05:47 PM
:DHey Scott, You've done it again:D Mc Master Carr has some plastic U shaped channel, I'm planning on using some for my dozer undercarrige.
Later, Neil#2 aka doodlebug.
http://www.mcmaster.com/#plastic-u-channels/=cfnjik See page 1023 for chain guide's.

SmallHaul
05-23-2011, 06:30 PM
:DHey Scott, You've done it again:D Mc Master Carr has some plastic U shaped channel, I'm planning on using some for my dozer undercarrige.
Later, Neil#2 aka doodlebug.
http://www.mcmaster.com/#plastic-u-channels/=cfnjik See page 1023 for chain guide's.

Thanks Niel:) Thanks for the link, I'll probably use small narrow delrin pieces that won't be visible from the outside.

Jared
05-23-2011, 09:15 PM
Man, that looks and works great! I like!

td9clyde
05-23-2011, 10:21 PM
lookin great

modelman
05-25-2011, 11:30 AM
SmallHaul-that machine looks like it works great!! I really like the cable shovels. In the 2nd video I can hear something that sounds like a servo glitching. Yes-No? If yes I don't see an antenna. Maybe a short antenna would stop this. Great job on the conversion!

SmallHaul
05-25-2011, 05:59 PM
SmallHaul-that machine looks like it works great!! I really like the cable shovels. In the 2nd video I can hear something that sounds like a servo glitching. Yes-No? If yes I don't see an antenna. Maybe a short antenna would stop this. Great job on the conversion!

Thank You very much Modelman. No, there is no glitching...maybe you hear the slack in the rotate chain when I change directions to fast.

SmallHaul
05-27-2011, 02:20 PM
Man, that looks and works great! I like!

Thank You!

lookin great

Thanks

Here is a cool video of a full scale one running, along with some other cable excavators.

http://www.youtube.com/watch?v=hpr3k_siJE4&feature=related

pumptech
05-27-2011, 10:06 PM
Cool video Smallhaul,enjoyed watching,:D
I'll bet the 1.1's are fun to operate.

SmallHaul
07-31-2011, 12:58 PM
Cool video Smallhaul,enjoyed watching,:D
I'll bet the 1.1's are fun to operate.

I think you are right. I would like to run a 1:1 one.:)

Well, I got some paint on it now. Some clean pics before I get it dirty again.

http://i240.photobucket.com/albums/ff66/scottmaxxin/cableexc3.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/cableexc4.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/CableExc1.jpg

http://i240.photobucket.com/albums/ff66/scottmaxxin/cableexc2.jpg

td9clyde
07-31-2011, 04:13 PM
very cool cable hoe very old old school couldn't imagine putting in strorm drains with one of those lol

Bsorenson79
07-31-2011, 04:44 PM
Not easy to load with this central sprocket design, but there's not a lot of these left, so it was worth saving it ;)

By the way, it was fun to carry it back home....

http://i78.servimg.com/u/f78/12/58/20/29/p1000211.jpg (http://www.servimg.com/image_preview.php?i=77&u=12582029)

No not get off point, but look at those wheels on the back end of that low boy.

SmallHaul
07-31-2011, 07:47 PM
Here is a video of it driving around. The ground is too hard for it to dig so, I just moved a rock to show some bucket movement.

http://www.youtube.com/watch?v=bOa0HdqCqdI

9W Monighan
08-01-2011, 07:31 AM
Works very nice Scott

Straywolf
08-01-2011, 11:27 AM
Man you really are pimping that hoe(pun intended):D I know don't give up my day job.....wait i'm retired;)

But seriously excellent work on the Cable Hoe.:D

SmallHaul
08-01-2011, 06:45 PM
very cool cable hoe very old old school couldn't imagine putting in strorm drains with one of those lol

Thanks, I guess you would just use lots of fuel and patients.:D

Works very nice Scott

Thanks!

Man you really are pimping that hoe(pun intended):D I know don't give up my day job.....wait i'm retired;)

HA!

But seriously excellent work on the Cable Hoe.:D

Thank You.

dirtpusher9
08-01-2011, 08:20 PM
Smooth operator!! Nice working unit, Scott.

SmallHaul
08-01-2011, 09:22 PM
Thank You Joe.:)

ihbuilder
08-01-2011, 09:38 PM
looks real nice Scott , bring it up at the end off the week to help clean the chip pans :D:p:p:p

SmallHaul
08-15-2011, 08:11 PM
looks real nice Scott , bring it up at the end off the week to help clean the chip pans :D:p:p:p

Thanks Steve.:D

Steve (9W Monighan) made a nice HD video of it crawling & digging, Thanks Steve.

http://www.youtube.com/watch?v=X4FZzVHOslw&feature=mfu_in_order&list=UL

SmallHaul
08-16-2011, 07:52 PM
Sound system added:

http://www.youtube.com/watch?v=-AxG5JXUpvI

doodlebug
08-17-2011, 12:21 AM
Hey Scott, Yer over the top, LOL! Keep it up! Any progress on the new boom yet?
Thank's for sharing! Later, Neil#2 aka doodlebug.

SmallHaul
08-17-2011, 06:32 AM
Hey Scott, Yer over the top, LOL! Keep it up! Any progress on the new boom yet?
Thank's for sharing! Later, Neil#2 aka doodlebug.

Thanks Neil.:D

I am still getting ideas on the new boom. If I made it out of brass the extra weight would help it dig even better. I met a guy at the show that has a full scale Unit Hoe and he ran mine for about 20 minutes and commented that the stick is too long so, I'll have to go back over the numbers and see where I need to shorten it.

Papy
08-17-2011, 11:16 AM
...I'll have to go back over the numbers and see where I need to shorten it.

I can give you some measurements of a real machine, probably close to your's (see this thread (http://www.rctruckandconstruction.com/showthread.php?t=1382))...this could help to calculate right proportions :)

SmallHaul
08-25-2011, 11:28 AM
I can give you some measurements of a real machine, probably close to your's (see this thread (http://www.rctruckandconstruction.com/showthread.php?t=1382))...this could help to calculate right proportions :)

Thanks but, Neil gave me all the numbers I just need to check them.

9W Monighan
12-02-2011, 01:52 PM
Have you ever seen this machine Scott? It was at the 2008 Brownsville show with the HCEA convention.
http://i268.photobucket.com/albums/jj26/Lashlander/2219.jpg

SmallHaul
12-02-2011, 04:20 PM
No Steve I haven't. Good picture of a nice machine. Thanks.

Reminds me that I need to shorten the stick on mine so that it looks better.

pumptech
12-02-2011, 05:57 PM
Wow! Thats a really nice looking cable hoe,thanks for sharing that pic 9W:)
Luv your cablehoe Smallhaul ,very cool build!!!:)

Stuff
12-02-2011, 10:41 PM
wow! dang near "done"

UnitCrane514
06-22-2012, 09:24 AM
Where do you guys find the sprockets for this stuff at????

SmallHaul
06-22-2012, 03:07 PM
Where do you guys find the sprockets for this stuff at????

http://www.surpluscenter.com/sort.asp?PAGELEN=20&PageNo=2

Great prices and good inventory.

kcusumano
03-19-2013, 04:51 PM
wow lookin great

Rvjimd
05-06-2013, 07:41 AM
Scott,

Where are you finding your donor units? I've been telling myself I need to get to some yard sales this spring to see if I can find anything to convert.

Looked at the local antique stores but didn't really see anything.

Also, do you have any pictures of the electrical connections for the hoe pivot? Did you use an audio jack?

Thanks

Jim

SmallHaul
05-06-2013, 08:26 AM
Jim,

i bought both of my Units off ebay years ago. Now they ask crazy prices for them.

i run a JR 9503 in the cable Hoe and with JR & Spektrum you can bind multiple rx's to one radio at the same time. So, i have a separate battery, rx and power switch in the undercarriage.

i use these $6 rx's from hobby king:

http://www.hobbyking.com/hobbyking/store/__28554__OrangeRx_R615_Spektrum_JR_DSM2_Compatible _6Ch_2_4Ghz_Receiver.html

Rvjimd
05-06-2013, 08:28 AM
Scott,

I sort of thought, "that would be cool if you could do the two RX thing!" I wonder if you can do that with the DX6i?


I guess I need to look for some garage sales and see if I get lucky!

Jim

Rvjimd
05-29-2013, 10:17 AM
Scott,

Another question. Where are you getting the brass pulleys, like on the stick?

Thanks

Jim

PS I tried binding two RX to my DX6i and that does work.

SmallHaul
05-29-2013, 12:00 PM
Scott,

Another question. Where are you getting the brass pulleys, like on the stick?

Thanks

Jim

PS I tried binding two RX to my DX6i and that does work.

Jim.

The pulleys are meccano pulleys and can be found on ebay UK.

The are from vintage mechanical toy sets.

Lil Giants
05-29-2013, 02:31 PM
Jim

PS I tried binding two RX to my DX6i and that does work.

With Spektrum, the rx's won't work simutaneously, a model change in the menu is necessary. Is the JR or Hobby King rx's any different.

pigeonfarmboy
05-29-2013, 02:34 PM
Helps to be a Spektrum/JR DSMX receiver and radio to bind multiple receivers to one radio.

Rvjimd
05-29-2013, 02:36 PM
Has to be a Spektrum/JR DSMX receiver and radio to bind multiple receivers to one radio.

It worked for me, I did read that BOTH RX that you use must be the same bit rate. Dsmx or dsm2. They can not be one of each.

Jim

SmallHaul
05-29-2013, 05:16 PM
Helps to be a Spektrum/JR DSMX receiver and radio to bind multiple receivers to one radio.

I am using a JR9503 (non-X) and two hobby king clone $9 rx's both bound to my JR9503 at the same time and it works fine.

SmallHaul
05-29-2013, 05:23 PM
With Spektrum, the rx's won't work simutaneously, a model change in the menu is necessary. Is the JR or Hobby King rx's any different.

The way i understand it, as long as the rx's are the same, you can bind an infinite number of them to a radio at one time.

In other words for example: you can take 10 ar6110e rx's put them all in bind mode and then hold the bind button on your tx and turn it on and it will bind to all of them and control of them at the same time.

SmallHaul
11-03-2013, 08:49 PM
i received a private message with a couple of questions...

The track chain is #35 chain with k-1 links on every other link.

The track pads are made out of aluminum nosing that is used for counter tops.

Folks, don't be afraid to ask questions in the thread you have questions about. Most people enjoy talking about their builds and don't mind sharing information.:)

Have fun!

dman10
11-03-2013, 09:16 PM
Thanks, also, how do they size the chain?

SmallHaul
11-03-2013, 09:42 PM
This explains #35 chain:

http://www.ehow.com/info_8079990_difference-35-chain-40-chain.html

The smaller chain that drives off of the servo is #25 chain and is actually very strong too.

i can't remember the place where i got the #35 chain with K-1 links from but, any place that sells bearings and drives should be able to order it for you.

Rvjimd
09-11-2014, 11:05 PM
Scott,

I just went thru this entire thread again, lots of good info, thanks!

Jim

SmallHaul
09-12-2014, 08:02 AM
Thanks Jim.

It is nice to have detailed build information to get more people to build equipment in this hobby.

Old Mechanic
11-09-2014, 07:22 PM
Hi smallhaul,

I have been looking at some of your different videos and wanted to know if one take up spool runs free when another is moving the arm, or do you control each one at the same time with stick movement? In other words when one is taking in cable is the other spool running out under power or free wheeling? Hope you can figure out what I am asking about. If you do this with stick movement I would like to see a video showing the stick movements and the bucket & arms at the same time. It must keep you busy.

I have an old Unit Crane that was given to me for Christmas when I was 11 years old..... I am now 76. Did you make or buy the extension boom section on your drag line version? I would like to try a drag line version but feel the boom should be longer to get proper reach.

I really enjoy all of the info in your posts and am learning a lot. The are very good at explaining folks questions and what you have done to get the finished results.

Thanks a lot. Keep up the good work!

SmallHaul
11-09-2014, 08:12 PM
Hi smallhaul,

I have been looking at some of your different videos and wanted to know if one take up spool runs free when another is moving the arm, or do you control each one at the same time with stick movement? In other words when one is taking in cable is the other spool running out under power or free wheeling? Hope you can figure out what I am asking about. If you do this with stick movement I would like to see a video showing the stick movements and the bucket & arms at the same time. It must keep you busy.

I have an old Unit Crane that was given to me for Christmas when I was 11 years old..... I am now 76. Did you make or buy the extension boom section on your drag line version? I would like to try a drag line version but feel the boom should be longer to get proper reach.

I really enjoy all of the info in your posts and am learning a lot. The are very good at explaining folks questions and what you have done to get the finished results.

Thanks a lot. Keep up the good work!

Hello Old Mechanic, Both cable lines are tight most of the time working together to control the stick/bucket... I have both the Unit cable shovel and the Unit dragline setup the same way. Here is a video from my old youtube channel showing the radio functions on the Unit drag line.

https://www.youtube.com/watch?v=1sm6hullRWI&list=UUh8Hp_o3QbBWIWHuSZKOPBw

Cable machines have a hoist cable (cable that goes to the top of the boom to lift up) and a crowd cable (cable that goes towards the machine to pull in).

So to dig with a cable shovel you would lift with the hoist cable and keep the crowd line tight to raise the boom/stick/bucket assembly and then rotate over where you want to dig..then let the crowd cable out to extend the bucket out and then let hoist cable out to lay the fully extended arm down on the ground..then start pulling in on the hoist cable and as you pull in if you don't let some hoist cable out the whole assembly will rise so, depending on how deep you are digging you might have to give more slack to the hoist cable. It is hard to get used to on a model and even harder on a full scale machine. The first time i ran a full scale drag line i couldn't believe how hard it is to run and a cable shovel is slightly harder imho.

You really do need to keep both cables tight all of the time so that they don't get messed up on the drum. With the small models it is no big deal if you let the cables go slack on occasion but, on a full scale machine letting the cables go slack for even a few seconds can cause problems and or damage.

I have the info for the guy that i got my boom extensions from if you would like to pm me for it. I don't want to post his number up.

You should convert your Unit drag line to rc though it will give you hours and hours of enjoyment.

Claus
04-03-2016, 01:20 AM
One of the great classic builds! Scott builds excitement.