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 21:14:06 GMT
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Original-From:
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John A. Tamplin <JAT@TRAVELLERspamcake.COM>
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Viewed:
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1176 times
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On 3 Mar 1999, Russell Nelson wrote:
> 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
That's why I mentioned the gearing ratio, if you change the gearing from the
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 those particular tires other than another RIS?) closer
to the center of rotation than the radius of the tire.
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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| 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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