Subject:
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Re: Three-wheel Synchro Drive
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 3 Mar 1999 20:56:26 GMT
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Original-From:
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John A. Tamplin <jat@[Spamcake]traveller.com>
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Viewed:
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1104 times
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On 3 Mar 1999, Russell Nelson wrote:
> Hey, that's the key -- actually *rotate* the wheels as you turn their
> direction. Then, the wheels will inscribe a small arc, but the
> platform won't move. And if you want to be *really* clever about it,
> you could use a differential to add the wheel turning to the wheel
> rotation so it automagically happens.
Actually, you don't need the differential -- if you put the power axle
down the center of rotation for the wheel assembly, turning the wheel
assembly induces a rotation of the power axle (relative to the wheel
assembly). With the proper gearing and location of the tire, this results
in precisely the motion required for the tire to turn with the wheel
assembly with no scrubbing.
This was the point I missed from the original design -- I had been trying to
locate the tire along the axis of rotation and use a differential to
subtract out the induced rotation of the power axle, but kept running
into problems matching gearing ratios. The original design was quite clever
in this respect.
John A. Tamplin Traveller Information Services
jat@Traveller.COM 2104 West Ferry Way
256/705-7007 - FAX 256/705-7100 Huntsville, AL 35801
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: Three-wheel Synchro Drive
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| Mark Tarrabain writes: > I do not believe trying to center the wheels on their axis of vertical rotation > is a good idea. Although doing so would drop the amount of motion in the > platform to virtually zero when the wheels are changing directions, (...) (26 years ago, 3-Mar-99, to lugnet.robotics)
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