Unit Cable Hoe
 

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/f...s/IMG_1433.jpg

http://i240.photobucket.com/albums/f...s/IMG_1429.jpg

http://i240.photobucket.com/albums/f...s/IMG_1432.jpg

http://i240.photobucket.com/albums/f...s/IMG_1430.jpg

http://i240.photobucket.com/albums/f...s/IMG_1431.jpg

1:1 for reference:

http://farm5.static.flickr.com/4096/...97d3159e_z.jpg

Re: Unit Cable Hoe
 

This is going to be a nice build. I going to watch this one

Re: Unit Cable Hoe
 

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

Re: Unit Cable Hoe
 

Great! Watching and waiting...

Re: Unit Cable Hoe
 

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

Re: Unit Cable Hoe
 

Thanks

Thanks Greg, that is a BIG help!

Thanks

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

Re: Unit Cable Hoe
 

You may need a dozer with a winch too for the really steep hills. It could pull you up as the pipe line advances.

Re: Unit Cable Hoe
 

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

Re: Unit Cable Hoe
 

That would be cool.

No, this Unit is another unit.:p

Re: Unit Cable Hoe
 

Hey Smallhaul
Great idea for a build.:)
Looking forward to seeing this build.

Re: Unit Cable Hoe
 

Very cool, always thinking outside the box.

Re: Unit Cable Hoe
 

Thanks Pumptech!

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/f...trackchain.jpg

http://i240.photobucket.com/albums/f...rackchain2.jpg

http://i240.photobucket.com/albums/f...rackchain3.jpg

Re: Unit Cable Hoe
 

The track chain looks great. Where did you order from?

Re: Unit Cable Hoe
 

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

Re: Unit Cable Hoe
 

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.:)

Re: Unit Cable Hoe
 

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.:)

Re: Unit Cable Hoe
 

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.

Re: Unit Cable Hoe
 

wow that looks awesome!! this one is gonna be a heck of a tracker!

Re: Unit Cable Hoe
 

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!

Re: Unit Cable Hoe
 

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.:)

Re: Unit Cable Hoe
 

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

Re: Unit Cable Hoe
 

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

Re: Unit Cable Hoe
 

Thank You very much Mike.

Thanks Lou.

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

Re: Unit Cable Hoe
 

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.

Re: Unit Cable Hoe
 

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.

Re: Unit Cable Hoe
 

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

Re: Unit Cable Hoe
 

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

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

Re: Unit Cable Hoe
 

That looks powerful enough Scott. You ought to put a ammeter in line to see how much current draw you have.

Re: Unit Cable Hoe
 

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.

Re: Unit Cable Hoe
 

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.

Re: Unit Cable Hoe
 

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.

Re: Unit Cable Hoe
 

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

Re: Unit Cable Hoe
 

11.70 each for 200oz servos!! **** man!!


also that video was awesome!!

Re: Unit Cable Hoe
 

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.

Re: Unit Cable Hoe
 

Dragline Wheelie:D:D:D:D:p

Re: Unit Cable Hoe
 

this is what im getting http://www.servodatabase.com/servo/springrc/sm-s4315r
http://www.servodatabase.com/images/...-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.

Re: Unit Cable Hoe
 

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/f...ucks/sides.jpg

http://i240.photobucket.com/albums/f.../sidessize.jpg

http://i240.photobucket.com/albums/f...dingbucket.jpg

http://i240.photobucket.com/albums/f...ingbucket2.jpg

http://i240.photobucket.com/albums/f...cketbottom.jpg

http://i240.photobucket.com/albums/f...bucketside.jpg

Re: Unit Cable Hoe
 

This pic shows a better size comparison to the dragline bucket.

http://i240.photobucket.com/albums/f...ks/buckets.jpg

Re: Unit Cable Hoe
 

Scott that looks real good for the first time. Ed

Re: Unit Cable Hoe
 

Thanks Ed. Now I need to make some long nasty looking teeth for the front of it like the real ones have. :D