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 21:07:15 GMT
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Original-From:
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Russell Nelson <nelson@crynwr.AVOIDSPAMcom>
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Viewed:
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1125 times
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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 differential to add the wheel turning to the wheel
> rotation so it automagically happens.
Even easier (as Paul Speed pointed out afterwards), use a pair of
bevel gears, and put the wheel at the same distance from the shaft as
its diameter. I modelled one of them, and it works great! Only thing
I don't like is that the wheel is offset from the mounting shaft so
the bogey has a torque exerted on it.
Pictures: http://www.crynwr.com/lego-robotics/bogey.jpg and
http://www.crynwr.com/lego-robotics/bogey1.jpg
--
-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 1 Reply:
 | | Re: Three-wheel Synchro Drive
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| (...) power shaft to the tire, you can move the tire closer than that. I used a 24t crown gear to make the 90 degree transition, then a 24t to 40t gear reduction so I could put the large tires that come with RIS (anybody know a source for more of (...) (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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| 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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