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 21:24:11 GMT
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Viewed:
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752 times
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In lugnet.robotics, Issac Merkle writes:
> > 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 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 plates!) to drive the differential. Originally if you stalled the wheels
and turned the driveshaft the idler axle would pop off. Tf that didn't happen
(drive the other side of the diff so there's no offset), the 1x6 beam holding
the drive shaft at the crown gear would pop off. If *that* didn't happen
(mount it with a an axle rather than a beam) then the 24t crown gear would
skip! So I found some of the new mega bevel gears from the DDK and used
those. They are a far superior means of turning 90 degrees. As much of an
improvement over the 24t crown as the new 12t bevel is over the old 14t bevel!
Plus they appear to mesh at any angle AND they come in two sizes.
> I encountered both of these problems in a large 4WD/4WS/4WS chassis I'm
> playing with.
I bet these would be ideal for suspended, powered, turning wheels. The
question is where to get them in bulk! I wish I could trade in my giant pile
of 24t crown gears! LEGO, it's time for a new service pack!
--Ben
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Message is in Reply To:
 | | Re: 2 Motors -> 1 axle
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| (...) SNIP (...) 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 (...) (25 years ago, 7-Jan-00, to lugnet.robotics)
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