New member. Building D8

[Fired up]

Good day to everyone. Just intruduced to rc construction. I have been involved in rc racing and airplanes for the past 25 years. Seen li giants you tube page and brought back thoughts and dreams of when I was a kid. Thought it would be very net to have working rc construction equipment. I think we all love construction equipment when we were kids.
I chose the user name fired up because I and very fired up to build a project and have decided to build a d8. Now gathering parts and pieces. Thanks to some of the threads here for info. I will post some pics as I build. Thanks for the inspiration and great builds
Patrick.

[bigTdozer]

Welcome aboard will your build be a high track or old style? can't wait to see some build pics and good.luck if you go to page 3 in the construction forum there is a terex and D 7

[Fired up]

Had a chance to get some parts started today 5 out of 18 giude wheels done

[Fired up]

Some parts in but weather bad here in New Brunswick so will have to wait to get them maybe first of next week. Going to try to get to shop today and turn more guide wheels. To answer your question on which type i am building its going to be a hight track one. this is the picture from the D8 brochure that i used to inlarge to work by. Hope it turns out. I am using alot of ideas that RCLogger used in his build. thanks for the great ideas.

[modelman]

What scale are you building?

[Fired up]

I am building it around 1/14. Hope to get my parts that I ordered tomorrow. Start turning the wheels for tracks.

[doodlebug]

Welcome Aboard!

[RCLogger]

Welcome Patrick
Looking forward to watch your progress..

Greg

[Fired up]

Thanks everyone for the welcome. I have picked up my parts. Won't get to shop till Friday now. This work thing gets in the way sometimes. Lol

[RCP57]

Thanks everyone for the welcome. I have picked up my parts. Won't get to shop till Friday now. This work thing gets in the way sometimes. Lol

Hey, It's Friday... Whatcha buildin?:p

Reg

[Fired up]

Fridays here and gone. Got tied up in local volunteer fire deptment business. Never got in the shop. I have lots of parts. Got motors from servo city attach ment chain ordered lots of round stock on hand just need to get at the lath. Has any one used grease to tighten the track. That's what my plan is right now using 5/8 round stock going into 1 3/4. With 2 1/2 wheels at each end. Would like feed back on the grease idea. Thanks.

[td9clyde]

Grease is messy I use springs and 1/4 inch bolts in a piece of pipe, I can show you a diagram.

[FabOne]

Glad to have you join us Patrick! Looking forward for all the updates on your build!

-Terry

[Fired up]

Had time in the shop last couple days. Finished the rollers for the under carriage. Started to turn the bigger wheels for each end of the tracks. Very slow with my small lath. The pieces that I'm using are 2 3/4 and all most to big for my lath. But fit. I am turning them down to 2 3/8 same size as the sprockets that I have. Hope to get more done this week.

[Fired up]

It's been awhile but I am back at this build. I using a 3/4 steel plate for my base to add a low center of gravity. I thought about using grease but chose to use a spring to tension the track. Here are a few picks of what I have done

[Fired up]

As u can see this build is taking ideas from many of the same builds on this forum.

[Fired up]

More pics.

[Fired up]

Here's how I am making the track adjuster.

[Fired up]

One spring might not be enough

[Fired up]

Shaft installed

[Fired up]

Ready to install wheel.

[Fired up]

Shaping up.

[Fired up]

Comparing against plan

[Fired up]

Coming together.

[dirtpusher9]

Looking good. Just watch that Cat drawing, they are not totally to scale. I think this is done on purpose. Just a heads up.

[Fired up]

Thanks for the heads up. I am cross referencing measurements also. Has any one ever used the hyd pump from rc4x4? I will post more pic of my progress soon

[Animal]

Welcome to the forum:) Great start, looking forward to seeing the progress.

[Fired up]

Here's a mock up of cab. Still not sure if am using electric actuators or hydraulics. How do u hook up two speed controllers to one receiver ?

[Lil Giants]

Sabertooth dual motor controller (http://www.dimensionengineering.com/products/sabertooth2x25)

I vote for hydraulics, much faster, more realistic movements than electric actuators.

[Fired up]

Had more time to work. A cnc would be nice. Lol table saw and jig saw is slow.

[Fired up]

Body work.

[Fired up]

Small parts.

[Fired up]

Riveting it together.

[Fired up]

Once everything fitted will take apart and cut my windows. Looking for sujestions on plastic for windows.

[Fired up]

Has any ordered from premcon. Also wondering what duty would be like from Germany to Canada ?

[Lil Giants]

There's no duty. You'll pay 5% GST & whatever your provincial sales tax is when you receive the parcel.

Payment is usually done with a bank wire, but you could ask if they have paypal or other.

[Fired up]

Great thanks for info. I have decided to go hydro. Ordering from premacon pump fittings,hose extra. Here's what I've done today.

[Cooper]

I'm curious to know what motors you went with, and controllers? I'm building a d11 and haven't decided what setup to go with. So I'm always trying to figure out what others do.

[Fired up]

I am using the same motors as rclogger. Watched his videos and they seem to work very well. I am using the sabourtooth 2/25 Controller. I have had it hooked up and seems to work really good. I weighed my d8 with out electics hydraulics and no blade and it was 36lbs. I figure when done be around 50lbs. Hydraulics are ordered hope to see them in a couple weeks. I have most of the building done. Time to tare it apart to get some paint on it.

[DADSGARAGE]

Nice job on the dozer build..keep up the good work!!

[Fired up]

Thanks far cry from some of the detailed builds on this forum hope it works as good as some that I have seen here.

[Espeefan]

Nice work, Fired up. What sort of metal working equipment do you have at your disposal? Even if you don't think your dozer is quite as detailed as some others, I think it looks great. Just shows that sometimes you don't necessarily need a lot of fancy CNC equipment to make a nice functional model.

For window glass, you could always go with some clear, thinner acrylic plate, or maybe some polycarbonate / lexan sheet, cut to size. Maybe make some gaskets out of sheet styrene to hold the 'glass' in place (sandwiched between the cab walls) on both sides, or maybe an aluminum window frame on the inside of the cab wall, slightly smaller then the window opening itself, so that the glass can be glued into that resulting window pocket with a clear drying canopy glue for models.

[tracksntreadslou]

Wow you Build fast and awsome work ..I have been watching from the start and now lookinf forward to some dirt pushing vids ..awsome ..keep up the great work
I was at my local liquidation world and found some very cheap smoked clear totes ..less than an 3/32 thick ..Should work for my grader windowws

[Fired up]

Thanks for your encouraging words. All I have far as metal working equipment is a small metal lath. Every thing else I have is for woodworking. Far as glass I picked up some lexan. At a glass shop. May not be pushing much dirt for a while we got 17 inch of snow last week and calling for more this weekend.

[Fired up]

Here's the new addition. To my small fleet. I needed something to Haul my dozer. Now to build a deft trailer and a dump trailer. After dozer gets finished.

[Fired up]

Well I do not have a lot of time this time of year my shop turns into santas work shop as I usually have some kind of Christmas gift to build. This year it's a fire place. But I did get a half hour and put together my interior I primed it and it's waiting for finish paint. I hope to see my hydraulics the end of this month. Thanks for looking. And merry Xmas to all.

[DADSGARAGE]

Thanks for your encouraging words. All I have far as metal working equipment is a small metal lath. Every thing else I have is for woodworking. Far as glass I picked up some lexan. At a glass shop. May not be pushing much dirt for a while we got 17 inch of snow last week and calling for more this weekend.

17" of snow...so you're saying you just got a little bit snow??!! Yikes!! With that much snow you may wish the dozer was 1/4 scale..LOL

How wide is the blade on your dozer?? And how big is your driveway....

Looking forward to seeing more pics as you build !!!

[Fired up]

Blade is 13''. And drive way to big lol. But would stop me from trying if I had the hydraulics working

[Fired up]

Still waiting Hydr parts. Hope to see them soon. I did receive a sound modular for it to day and some wheels for my low boy. Not sure about starting the paint until l get the hydraulics in and working just in case something needs tweaked. Hard to find time in shop lately with all this snow. I have at lest 3 feet of snow here.

[Fired up]

Well as I am waiting let's start a low boy trailer to haul dozer. Pic of mock up. 3 axels or 2. I think 3. Can anyone tell me how well or not well the stock king hauler pulls. Dozer will be around 50lbs and trailer weight witch could be 15-20 lbs. any suggestions.

[Fired up]

Had a couple hours here's a start for lowboy. Clean it up some later.

[Lil Giants]

A bare stock will pull it ok, but at least 3:1 additional gear reduction would be better control. Lock the rearmost axle.

[Fired up]

How do you lock the rear axle the gear reduction is that from rc4x4 ?

[Fired up]

I am building this project as cheap as I can here's the first axle. Using threaded rod with long nut on each end passing through 1/2 by 1/2 square tubing

[Fired up]

Here's anther view of axel. Like I said building this as cheap as I can I am make the wheels out of hockey pucks turning them on my lath. Still thinking of how to build the goose neck.

[Lil Giants]

Take the axle off the trk, split the plastic case, take the diff apart & there you will see the 3 small bevel gears on the cross. Slide one spider gear off the cross & drop it between the other 2. Reassemble the axle.

Locking the rearmost axle doesn't seem to hamper the steering too much, but does help immensely in pulling in the dirt. Of course 6wd is even better yet & adding Shoe Goo to front 2 diffs is the best for limited slip & great steering control.

[Fired up]

Great thanks will look in to it. Here is a few pics of axles installed

[Fired up]

Pic of axle pieces.

[Fired up]

I am going to put a new duel speed control in my king haule and was wondering if I could use a 12amp in it or should I go with the 25amp. Any suggestion
Thanks

[RCP57]

12amp should be fine. I use a Sabertooth 2x12 in my 850 Kenworth and it only overloads it while in high gear towing a load. The truck is around 100 pounds at that point.

[JAMMER]

Very nice work it's coming a long nicely. Ed

[Fired up]

Ooh look what came today.

[Fired up]

Any suggestions on how to hook everything up. Do I need an air relief on tank?

[Fired up]

Looking for a hand in hooking my hydraulics. First question is my valve bank has holes on each end straight through. One is for return to tank and other from pump. Do I put both lines on one end and plug the other end or do I put line from pump on one end and return on other end on opposite sides? Any help would be great thanks Patrick

[Fired up]

I had some time to play today. I started to get my hydraulics put together when I tried it I blow a line. I came to the conclusion that I may need a relief valve. I am not able to run motor steady with out it blowing a line. I assume it because of no relief valve.

[RCP57]

Yes you will need a relief valve for sure.

[Fired up]

Ok that's what I thought. With the relief valve pump will be able to run continuously? Thanks for the help.

[Lil Giants]

Here's Fumotec's PDF of his track hoe, scroll down to pg17 for the hyd system installation. It's the same system that Premacon assembles to sell as a kit.

http://www.fumotec.de/downloads/komatsu-anleitung-klein.pdf

Your pressure line on one side of the valve & the pressure relief valve on the direct opposite side. The other two ports should be plumbed back to the oil tank with inline filters. The one returning oil line will be Y'd to the prv.

Fumotec uses fuel tanks from helicopters (he is afterall an employee of Vario Helicopters) for oil reservoirs. Your dozer wouldn't need a tank capacity of any more than 250ml or so.

That Jung pump is capable of putting out 100bar (1400psi), so when you deadend the cyl stroke & the oil has no where else to go, the pressure line will explode in an instant! I hope you're wearing eye protection when you're messing this stuff?! ;)

[Lil Giants]

Here's a couple of pics of my Norwegian friend Ole Iverson Vario hoe.

http://img.photobucket.com/albums/v226/Vforce/RC/HitachiZaxis870014-3.jpg


You can see in this pic at the left that the straight fitting is connected to the yellow return line, and the right angle fitting goes to the bottom of the prv. Then the side of the prv has a yellow return line Y'd with the above mentioned return line.
http://img.photobucket.com/albums/v226/Vforce/RC/HitachiZaxis870015-3.jpg

[Fired up]

Ok that helps a lot. Thank you very much. The pump I ordered was supposed to have a prv included but it's not with it. I emailed them yesterday but haven't heard anything back yet. It looks in the pics that there using rubber fuel line? In the PDF it looks like a line from one of the valve is returning with a filter on it. Not from the end of valve but from side.hope you know what I mean.

Just to be clear.
1-I will have a line from my tank to my pump
2 from pump to valve
3- from valve to tank with filter on one side of valve
4- directly accross from inlet from pump to valve I will put pressure relief valve with pressure gage then back to tank.
Why is prv y into return line from valve bank. Does that not back feed?

From control vales two lines to cylinders.

Sorry for being stupid trying to get it all straight.
Thanks again for your help. I am glade I went hydrulic works good. So once I get everything right it should work nicely.

[Lil Giants]

The CAD drawing is a little misleading, that return line is from the end of valve.

tank - pump - tee in pressure gauge - valve - prv - tank
the other port on each end are returning to the tank & each line has an inline filter.

The prv is Y'd to other returning line b/c where's the oil gonna go when it enters the prv? There's an in port & an out port on the prv. You understand how a prv works, right? A steel ball covers the inlet port, a heavy coil spring applies pressure to steel ball & an adjustable screw tensions up the spring so it takes a certain amount of oil pressure to compress the spring & allow oil past the steel ball. The oil entering the prv goes out a different free flow port.

[Fired up]

Yes I understand how the prv works just not clear on piping it. I really appreciate your help you are very knowledgeable. Now to get Prv that I didn't receive. I haven't received a reply yet. This forum rocks.
Thanks again.

[Fired up]

Now that I am back waiting for a prv I did some painting

[Fired up]

Ready for primer and paint

[Fired up]

Cab painted.

[Fired up]

Looking yellow. Can't wait to get it done and back together.

[Fired up]

Well I have a prv coming. But I picked one up at princes auto to try and works well a little big but works.heres a link to a video. Hope it works. Test #1. http://youtu.be/hmpVjNM-6w0

[Fired up]

Took a little time set hydraulics in dozer and hooked Blade up. Still need to adjust mixing channels. I have the prv set at 20 bar as suggested by Joe. I think he's right that is lots of pressure. Still need to tidy up hoses but it's all coming back out for paint. Here's a vid of working hydraulics in dozer. http://youtu.be/kyJywyNDNdg
Thanks for looking. Patrick.

[Lil Giants]

Pretty good speed up/down, higher pressure might increase it somewhat, but it looks to be close for acting quick enough while pushing. Good work! :cool:

Is that a 3s or 4s lipo in the 1st vid? What's the brand name?

[Fired up]

This is what I was running pump with I bought it to run track motors I might use the same for pump. Or go to an 18v like Greg uses in his. The speed was good and that was with pump not running at full speed. At around 20 bar like you suggested. I need to look at sizes of 18 v battery as it's very tight for space. Is it ok to run pump at slower speeds? Or should it run at faster speeds when pump is working.

I have striped the dozer down and started to paint it. I have a few things that I need to make for it like the track bed. Windows and some other small details.
But it's coming along nicely.
Thks for looking and all the help.
Patrick

[Lil Giants]

I guess you look online to see what the rated voltage is for the track & pump motors you're powering & don't exceed that.
The Jung pump in my Vario is running about 4000rpm (4s 16,8v @600kv, motor is 10,800rpm with a 2,5:1 belt reduction), and I only rev it to the max (or near it) on boom lift. Stick, bucket & boom down is 1/2 to 2/3's of that :confused:
Other guys are running their Vario hoes with 3s... that's a bit slow for me.

Thanx for the pic... what's the LxWxH, plz?

[Fired up]

Here's the specs.

[Lil Giants]

Cool! Canadian based company too, bonus! Thx for the info.

[Fired up]

I was working on my hydraulics to day setting them up and I notice that the motor/pump was arcing to my tank. Has anyone had this problem And how did you correct it.
Thanks Patrick.

[Lil Giants]

I've never heard of such a thing... got a picture to show placement of everything?

[Lmackattack]

Is it properly grounded...need to see a pic of what you got going on...

[carp]

Do you mean electrical arcing? i had something wierd happen once when my receiver antenna touched the pump housing it sparked and fried the aerial a bit, only ever happened once though and never found out why.

[Fired up]

Here's a pic of hydraulics in tractor. Now it doesn't seen to arc when it's installed only when I have it out side tractor.

I have a new problem. Hmmm. Anyone getting annoyed with me yet. For some resin one of my valves is only working for one direction. When I first hooked it up it worked but after using it a little bit it stopped. I first though that a line may have been plugged or the piston I have taken everything apart and there is no plugs. I even took valve all apart to check it and it's not plugged. I thought that I might have valve together wrong and it's not the case. I am stumped. Could a crack in the valve cause something like this. Has anyone had issues like this? Help please.

Thanks patrick

[Lil Giants]

Did you make sure to center each valve before installing the servos?

What's the servo doing? Is it making the full rotation either way? Does the problem happen with the mix on... something in your programming is limiting the servo from turning the valve?

If you do decide it's a problem with the valve, send it back to Premacon for them to look at & determine the cause.

I've never experienced such a problem with a failing valve.

[titandigs]

Here's a pic of hydraulics in tractor. Now it doesn't seen to arc when it's installed only when I have it out side tractor.

I have a new problem. Hmmm. Anyone getting annoyed with me yet. For some resin one of my valves is only working for one direction. When I first hooked it up it worked but after using it a little bit it stopped. I first though that a line may have been plugged or the piston I have taken everything apart and there is no plugs. I even took valve all apart to check it and it's not plugged. I thought that I might have valve together wrong and it's not the case. I am stumped. Could a crack in the valve cause something like this. Has anyone had issues like this? Help please.

Thanks patrick
I would also have a look at the servo as I have had new servos fail, the gear would strip in one spot for no reason. I put another servo in and all was fine.

[Fired up]

Well after a lot of frustration. I looked at it again and the servo was not working right. Thanks for the help I needed to step back and your suggestions were right on.
Thanks Patrick. Video coming soon.

[Fired up]

heres off it pushing dirt for the first time

https://www.youtube.com/watch?feature=player_detailpage&v=py-rT9rvgTQ

[Cooper]

That's cool!!! I wish I was that far along!!! I don't know much about the hydraulics, are you using two valves for the blade tilt? And how is your mix if u are? And I'm getting ready to put some wood floors in my house, I bet the wife would love for me to have a pile of fresh dry dirt in the living room!!! That would be my ultimate playpen!! (Uh and maybe the cats too,, would need excavator to deal with them!!). :)

[Lil Giants]

You've got some more fab work to do yet, eh ;)... like fill in the gap between the idlers to spread the weight over the entire track for better traction. :)

http://www.rctruckandconstruction.com/showthread.php?t=71&page=3

RCLogger used strip of hard plastic, maybe puck board, along the bottom length between idlers & just simulated rollers by cutting out the C channel. This dozer is 6yrs old & as far as I know he's never changed the plastic strips... but of course this is a smaller lighter dozer than what you have built.

Are your tracks spring tensioned at all?

You might want to fab up some track guards too to keep the dirt/rocks out of your links.

[Fired up]

I am using two valves at the moment I am having trouble with equal speed between pistons. I am planing on only using one for front blade as I want to add a ripper to back. Far as mixing yes but still learning. I maybe farther along then you but your detail is awesome. I am limited on equipment. At lest that's what I will use for excuse. Lol. I had a bucket of traction sand so I dumped it out in my shop. Not house lol wife wouldn't of liked that.

Yes I still have some fabricating to do. I made some small ideler wheels but not sure if I have room to use them. I was thinking of using nylon i didn't realize that's how Greg did it. I am waiting to get to my father he has some thick nylon hope to get there to see him soon. You have a good eye for detail. I just couldn't wait to try it. I haven't had a lot of time to work on it latly. Hope to have more time in the near future.
Thanks for the great comments. Patrick.

[DADSGARAGE]

Great job so far...nice to see it pushing some dirt!!!

I agree with Lil Giants comment on using a plastic slider idea to ride on the track chain... I used it on my dozer and so far it works great !!

( If you are interested watch the build vid I posted on the tube...may help give you some ideas...http://www.youtube.com/watch?v=AV596tHo0_o )

Keep up the good work!! Like how the hydaulics work!!