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 20:03:42 GMT
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Original-From:
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Russell Nelson <nelson@crynwr.=stopspam=com>
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Viewed:
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959 times
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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, it also has
> the undesirable side effect of directly fighting the friction between the ground
> and the tires. Keeping the wheels off-centered makes it so that the friction
> between the ground and the tires would cause the tires to spin, which does all
> the work necessary to compensate for the friction, thereby increasing the
> longevity of the tire treads, and reducing the amount of work necessary to change
> the tires' direction.
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.
--
-russ nelson <rn-sig@crynwr.com> http://crynwr.com/~nelson
Crynwr supports Open Source(tm) Software| PGPok | There is good evidence
521 Pleasant Valley Rd. | +1 315 268 1925 voice | that freedom is the
Potsdam, NY 13676-3213 | +1 315 268 9201 FAX | cause of world peace.
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 2 Replies:
 | | Re: Three-wheel Synchro Drive
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| (...) 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 (...) (26 years ago, 3-Mar-99, to lugnet.robotics)
| | | Re: Three-wheel Synchro Drive
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| Russell Nelson writes: > 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 (...) (26 years ago, 3-Mar-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Three-wheel Synchro Drive
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| (...) 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, it also has the (...) (26 years ago, 3-Mar-99, to lugnet.robotics)
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