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New 1/4 scale build ROCK CRAWLER!

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Old 01-04-2012, 02:42 PM
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306kid
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Default New 1/4 scale build ROCK CRAWLER!

Hi, im new on here but not to this hobby. Ive always had rc cars since a young boy, mainly tamiya electric. Later I owned a few traxxas nitro buggys an trucks an lastest was a team losi 8 buggy. Fed up of small cars with tempermental engines an over the top prices for designes I could always find problems with, I decided to look into making my own. After a lot of research, ive decided on a 1/4 scale rock crawler/off roader combo. 50cc 2stroke motor, 4 wheel drive, hydraulic disc brakes at each wheel, single speed forward only (to start with) and all topped off with a kids ride on toy (jeep) as the shell. Ive got a pair of bevel gears, engine, 4 ride on lawn mower wheels an the jeep shell. Working on the diffs to start with and will then work on the frame, bit backwards but I can see benifits to this. Ill upload pics of the parts as I make them.
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Old 01-04-2012, 05:01 PM
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Default RE: New 1/4 scale build ROCK CRAWLER!

The only problem I see with using that as a rock crawler is the transfer of power to the wheels. It could possibly work using a 6 channel Tx so you could apply brakes and throttle simultaniously, but it certainly wont be a smooth transition. Would be cool as hell to see a giant scale gasser crawler though!!!
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Old 01-05-2012, 02:09 AM
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Default RE: New 1/4 scale build ROCK CRAWLER!

Well the plan for the braking system was to have it set on an adjustable scale controlled by an additional servo. Rather than a normal set up which has brake 0 throttle, this would be adjustable from transmitted via cams etc so that at 0 throttle, the brakes are either off so that it can freewheel or at a set rate of braking to hold it in position. Will get some plans up further down the line. This is going to be a long project, leading into 2013 easily.
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Old 01-05-2012, 06:32 AM
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Default RE: New 1/4 scale build ROCK CRAWLER!

Yeah that was why I mentioned using a 6 channel radio. One servo for throttle, one for brake, one for steering (or two if you plan on doing 4 wheel steering)That way you can hold some brake pressure while slowly applyingpower.I would also use a high stall cutch spring to make it smoother. Do post up pics as you go!!!
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Old 01-05-2012, 11:46 AM
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Default RE: New 1/4 scale build ROCK CRAWLER!

Plan is to make the axels the same to allow 4wheel steer if wanted an 2wheel steer without much work. As for the clutch, I plan to use an adjustable clutch. Will allow to adjust biting point to suit. Due to the fact I have limited/no access to welding equipment, most of this build will be done with mechanic fastening methods.
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Old 01-05-2012, 05:29 PM
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Default RE: New 1/4 scale build ROCK CRAWLER!

Check out www.durafix.com All you need is a propane torch to use this stuff!!!
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Old 01-06-2012, 12:17 PM
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Default RE: New 1/4 scale build ROCK CRAWLER!


Quote:
ORIGINAL: Johnnysplits

Check out www.durafix.com All you need is a propane torch to use this stuff!!!
That stuff isnt as easy to use as they make it look,you have to have alot of heat i mean alot,and thge parts must be super clean and roughed up inorder for that stuff to stick
and then sometimes it still will not stick,atleast when i used it on aluminom.
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Old 01-06-2012, 12:24 PM
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Default RE: New 1/4 scale build ROCK CRAWLER!


Quote:
ORIGINAL: whittron


Quote:
ORIGINAL: Johnnysplits

Check out www.durafix.com All you need is a propane torch to use this stuff!!!
That stuff isnt as easy to use as they make it look,you have to have alot of heat i mean alot,and thge parts must be super clean and roughed up inorder for that stuff to stick
and then sometimes it still will not stick,atleast when i used it on aluminom.
Ditto. I tried the stuff on a cracked boat transom... just couldn't get it to stick. It was like trying to solder batteries without flux. Eventually I gave up and just used a friends tig welder.
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Old 01-06-2012, 01:36 PM
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Default RE: New 1/4 scale build ROCK CRAWLER!



Dont think I will be using the above mentioned methods, I can get welding done. Its just a pain as I will have to pay, so will get all the parts ready and then get it all welded in one go. Made a start on one of the diff casings today. 95mm OD (or 3 3/4ish inch) started with mild steel, but thinking this could get very heavy very quickly. So will order some aluminimum next week and try this. Will upload some pics of the build when I can.

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Old 01-06-2012, 04:21 PM
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Default RE: New 1/4 scale build ROCK CRAWLER!

Wow I thought that durafix would work good. I was just about to buy a pound of rods too. Guess i'll pass on it.
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Old 01-09-2012, 11:11 AM
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Default RE: New 1/4 scale build ROCK CRAWLER!

Couple of pics of the practice diff. Quickly knocked up out of mild steel. 4" alu turned up today, will start on machining later this week. 



This pic for size comparasion only
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Old 01-09-2012, 02:44 PM
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Default RE: New 1/4 scale build ROCK CRAWLER!

sweet!!
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Old 06-14-2012, 06:27 AM
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Default RE: New 1/4 scale build ROCK CRAWLER!

Hi buddy,

have you made these up yet? Are you able to sell one at all? Looking for something just like this at the moment. Iam in the UK.

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Old 06-21-2013, 10:03 AM
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Default RE: New 1/4 scale build ROCK CRAWLER!

if u dont mind me asking what size is the ring gear and were did u get itlookslike smething that would work for my dragsterdoug
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Old 06-21-2013, 06:24 PM
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Default RE: New 1/4 scale build ROCK CRAWLER!

Lol Doug, don't mean to bust on ya, but you did see the OP hasn't posted in this thread in over a year and a half, right?
Great way to bring back a dead thread!!
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