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Old 05-11-2007, 12:29 PM   #1
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Default Scratch built crawler

Hi All!
Saw these motors online a few weeks ago, thought i might be able to make a crawler out of them. They're from solarbotics.com and produce 50oz in of torque at 6v.

My first design was to use bits from another car and attach the motors to dogbones in place of a differential.

I then simplified the idea by using bearings between the motor and the frame, glued together and held with molded plastic.

http://picasaweb.google.com/jimboinue/RcStuff

the two axles will be held together with an aluminum rod glued into a bearing which is pressed into the cuttingboard piece.

Last edited by jimbo_style; 05-12-2007 at 02:17 PM.
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Old 05-11-2007, 12:31 PM   #2
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picis no worky!
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Old 05-11-2007, 12:46 PM   #3
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sorry bout that...they do now
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Old 05-11-2007, 12:59 PM   #4
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Links still don't work for me...
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Old 05-11-2007, 01:05 PM   #5
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Make your pics public rather than unlisted.
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Old 05-11-2007, 01:15 PM   #6
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they work when i click on them...
here's my picasa with all the pics
http://picasaweb.google.com/jimboinue/RcStuff


if anyone could tell me how to make the pics show up in the post, that'd be great.
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Old 05-11-2007, 01:18 PM   #7
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Default yea they

work
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Old 05-11-2007, 01:19 PM   #8
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thats very diff.
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Old 05-11-2007, 02:03 PM   #9
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Now that, is cool. Nice work.

Might want to rethink your steering setup, that ziptie around a motor looks like it has a lot of play.
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Old 05-11-2007, 02:59 PM   #10
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hmm...good suggestion, but if i was going with this setup i'd epoxy the zipties to the motors. I was wondering whether to go ahead like this, or to make two rear axles and then uses switches to make it "tank steer." The rear's a lot stronger than the front and will be able to put up with a lot more abuse...Waiting for the bearings to arrive before I can do anything at the moment though.
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Old 05-11-2007, 03:24 PM   #11
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yea man it looks pretty inventive, maybe alittle to inventive for my taste but great job!
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Old 05-12-2007, 02:04 PM   #12
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since the steering setup's proving to not be all that strong, i made a drawing of a different, hopefully more sturdy setup

http://picasaweb.google.com/jimboinu...53922173980418

Last edited by jimbo_style; 05-12-2007 at 02:13 PM.
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Old 05-12-2007, 02:31 PM   #13
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it may be sturdier, but it will require an enourmous servo to swing it. The further away fom the tire center line the steering centerline is, the larger the lever arm is, and the effort that is required is greatly increased.

could you mount the motor on a pivot plate at the output end instead of on the back of the motor?

got a link to the motors?
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Old 05-12-2007, 04:09 PM   #14
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not sure if i'd be able to do that....i have limited space on the wheel side of the motors as it is...

motors:solarbotics.com, they're the GM3s
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Old 05-12-2007, 08:34 PM   #15
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Quote:
Originally Posted by jimbo_style View Post
Hi All!
Saw these motors online a few weeks ago, thought i might be able to make a crawler out of them. They're from solarbotics.com and produce 50oz in of torque at 6v.
Would 50 oz. be enough to even turn the tires over.......while hanging in mid air?
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Old 05-12-2007, 10:02 PM   #16
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um, yes...its actually quite a lot, I took them apart and disabled the slipper, and there's tons of torque...hopefully you'll see soon once its done and I get a vid up
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Old 05-12-2007, 10:27 PM   #17
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Quote:
Originally Posted by jimbo_style View Post
Hi All!
Saw these motors online a few weeks ago, thought i might be able to make a crawler out of them. They're from solarbotics.com and produce 50oz in of torque at 6v.

Quote:
Originally Posted by jimbo_style View Post
um, yes...its actually quite a lot, I took them apart and disabled the slipper, and there's tons of torque...hopefully you'll see soon once its done and I get a vid up

Anything less that 1 full horsepower ain't worth having:-P :-P 2 horsepower is more like it though
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Old 05-13-2007, 05:03 PM   #18
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oh, good...lol

i was thinking of making this a torsion type design, i'd have the aluminum rod on a bearing holding the two halves together, then I'd use a flexible ruler attached near it to control flex!
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