Subject:
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Re: 2 Motors -> 1 axle
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 7 Jan 2000 18:36:04 GMT
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Original-From:
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Issac Merkle <the_gaff@hotmail.STOPSPAMMERScom>
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Viewed:
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532 times
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> I first tried having the motors separately drive the same axle. That is,
> the motors weren't directly connected to each other at all, except
> through the axle. Each motor drove a 24t crown gear, and each crown gear
> drove a separate 24t gear on the axle.
SNIP
> Unfortunately, the motors were different enough that the gears actually
> skipped teeth occasionally.
I think there are two reasons why you are having this problem. First,
because the twenty-four tooth crown gears are prone to skipping unless
really well reinforced, and second, because of the inertia of your model.
I encountered both of these problems in a large 4WD/4WS/4WS chassis I'm
playing with. When it first started off or changed directions rapidly, it
would skip gears. I disassembled a major portion of it and built new
supports for the twenty-four tooth crown gears (which mesh with the front
and rear differentials' twenty-four tooth gears), giving them no place to go
and no room to deform. The problem disappeared after that.
I'm powering the drive train with two motors; their outputs are connected
directly. The motors are on opposite ends of the chassis, joined by two
twelve-length crossaxles. There is a single eight-tooth gear on this long
drive axle which meshes with the twenty-four tooth gear on the central
differential. I filled all "unused" space on this long drive axle with
spacers and bushings; this seems to eliminate both torsion and wiggle.
> Now if I could just figure out how to stiffen the axle torsionally. I
> need a wide base for stability, but the long axle means that the wheels
> aren't locked together very well, there's lots of springy torsional
> wiggle between them, which twists my bot around a lot when it's whipping
> the wheels back and forth.
I reccomend you go and do likewise: fill "unused" axle space with bushings.
Regards,
Issac.
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Message has 1 Reply:
 | | Re: 2 Motors -> 1 axle
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| (...) I agree. I just rebuilt the backend of a 8428 "2010 Buggy" which I bought to be a small robot chassis (big mistake!). The original used a 24t crown gear to drive a 16t idler (mounted on an offset axle in a 1x2 2-hole beam secured by 2x2 (...) (25 years ago, 7-Jan-00, to lugnet.robotics)
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