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02-23-2010 03:49 AM  10 years ago
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fire_boy92

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houston TX

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Custom R/C tank help
I want to build a custom R/C tank. I have been kicking the idea around the last year. Here is the inspiration

Here is a quick cad drawing i did

I have made a few changes to what im thinking but here's the basics. 2 X traxxas rustler vxl trannys with locked diff going to each drive wheel. Dual brushless motors, esc's, and lipos. Im thinking of using an elevon mix in my radio to run the thing. I will build it out of aluminum and steel brake line. I made a custom tuber crawler one time with brake line and it turned out good.

The thing thats holding me back is the tracks. I think I have the tracks themselves figured out but im going to need some custom sprockets machined. Im thinking out of like a cutting board plastic material or aluminum.... The question I have is:

Anyone have a setup that could cut the gears for me? How much would you charge?? If I have to go to a local machine shop will the price blow me away? I need 8 of them but would probably get 16 just so I have an extra set. Any help is appreciated
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02-23-2010 04:11 AM  10 years ago
JasonJ

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North Idaho

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Most large scale RC tank tracks I have seen were built from wood blocks and rubber strips to form the assembly, with wood drive sprockets, support rollers and road wheels. There are websites dedicated to the hobby. Pretty cool stuff out there. We are talking serious size though, a few hundred pounds...
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02-23-2010 12:49 PM  10 years ago
fire_boy92

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houston TX

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Yeah I dont want to go big and slow, I want to go medium sized and fast lol. For each track Im thinking 1/4" almuinum flatbar. I will make a jig and drill 3/16" hols through the center long ways. Then I will fut a 3/16" steel/aluminum rod long enough to hang out each side and secure it with a set screw. I will have to make tons of these small links... they will attach to some sort of conveyor belt material and the contact surface will have replaceable rubber shoes on them.

I thought about wood sprockets but with steel or aluminum lugs i think it will eat it up too quick. I need something thats cut pretty precisely too.
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02-23-2010 02:42 PM  10 years ago
fla heli boy

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cape coral, florida

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nothing better than making something from scratch. Good luck and post whatever you do, I'll be watching!!!
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02-23-2010 08:31 PM  10 years ago
EKIM

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Long Island New York

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Maybe you can get some tips from this vid:

http://www.youtube.com/watch?v=CVNW...feature=related
*******Mike********
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02-24-2010 12:35 AM  10 years ago
fire_boy92

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houston TX

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NOOOOOOO!!!!! Someone beat me to it. I need to research that one a little more and see if I can get some better info. That is very similar to what I want, just about 3X as fast and not quite as tall, more long and sleek. We will see. I will post pics When I get around to actually putting something together. Its all drawing and thinking right now.
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02-24-2010 12:55 AM  10 years ago
Saint728

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Honolulu, Hawaii

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You can buy a scale tank and use some of the drive train for your tank? I know you can buy all the gearing, gears and metal tank tracks as well. Here is the link I go to get some things. http://www.tankzone.co.uk/cart/tam_t1.htm

Take Care,
Cheers, Patrick
Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo
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02-24-2010 01:00 AM  10 years ago
Gearhead

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Vt

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in a word or 2,, "Stock Drive Parts"

http://www.sdp-si.com/

I would go Gasoline, 26cc Zenoah
Jim
Buzz Buzz Buzz
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02-24-2010 01:21 AM  10 years ago
Brokenlink

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Oakdale

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Try looking here for parts and such
http://www.wedico.de/eng/ or here http://www.gardentrucking.com/
Jamie Griffith
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02-24-2010 01:25 AM  10 years ago
fire_boy92

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houston TX

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Hey thanks for the links guys. I want to do an electric first, then do a larger gas R/C, then an even larger on that I can fit 2 or three people in. Figure I can figure some things out building r/c before i build a full scale. Plus it will be a while till I can budget for the real deal so this will give me something to do.
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02-24-2010 04:17 AM  10 years ago
Brokenlink

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Oakdale

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Hey start looking for snowmobiles and parts,they should be pretty cheap in your area It should give you a few ideas.Jamie Griffith
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02-24-2010 04:31 PM  10 years ago
fire_boy92

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houston TX

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Whats a snowmobile?? haha ... It actually snowed here last night!
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02-27-2010 03:35 AM  10 years ago
fire_boy92

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houston TX

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the latest drawing. The upper body is just a rough sketch. Everything else I have done to scale.

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03-08-2010 08:16 PM  10 years ago
fire_boy92

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houston TX

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Been doing a lot more drawing on this thing. I broke down and bought a drill press today too so hopefully I can start to put something together soon. I scored some free 1/4" thick aluminum bar that I can make some of my pieces with, Once I get the larger plate for the main chassis I can really get rolling. I plan on making jigs for most of the parts so I can easily build others if it turns out well. I plan on making at leas 2 sets of everything the first go around. When I get anything picture worthy I will post them up ---- Chris
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03-10-2010 12:07 AM  10 years ago
fire_boy92

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houston TX

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I found a local cnc machine shop that will charge me $60 hr to cut the parts. The job for the tank will be less than one hr since I have all the design done myself. I could probably get 3 or 4 sets done in the 1st hour.

Does this rate seem fair? I have never priced this stuff before but it doesnt sound bad.
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03-10-2010 03:13 PM  10 years ago
BeltFedBrowning

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Kansas City

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My brother does CNC for a living and the shop where he works wouldn't let you in the door for $60. I say go for it and keep the pics coming!
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03-11-2010 05:13 PM  10 years ago
fire_boy92

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houston TX

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I got another quote back and it said for 13 pieces it would be $51.30 each..... Hmmmm is that $666.90 (13x51.30)??? or for each set of 13 it would be $51.30?

at the $51 I would probably get three done the first time. If I were to build these and they worked well would there be any interest in other people to buy them??? It would be cool to sell a few and recoup some of my costs.
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03-11-2010 05:52 PM  10 years ago
mmc205

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PA - USA

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thats $51 each i'm pretty sure. Most machine shops charge between $25-$75 dollars an hour dependent on the size, precision, cost of metal, and type of machine necessary (often this ties in with the requested precision)

Even a simple part on a CNC takes a few hours to get the blanks cut, load them, program it and then let it rip, which may be a few more hours of cutting.

You may want to think of fabbing your tank in two versions, one out of plywood/wood and then once the kinks are worked out, have a real version fabbed out of metal. Otherwise you may find you made a design error and $600 worth of parts are useless.
***Logo 600 vbar***Henseleit TDR vbar***
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03-11-2010 10:50 PM  10 years ago
fire_boy92

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houston TX

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Yes it was $666!! but i dont think the guy giving me the quote was on the same page as me. I think he quoted me 13 of the large main chassis parts and he included the price of materials. I was planning on doing a wood mock up first. I need a good milling vise for my drill press and it shouldnt be too hard.
.
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03-11-2010 11:16 PM  10 years ago
EKIM

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Long Island New York

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What about brazing it using brake line? Its nothing more than a tube chassis designed for tracks.If you know how to braze its a fairly simple design.*******Mike********
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