Subject:
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Re: The Differential and One-Motor Turning
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 20 Jan 2000 14:57:25 GMT
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Original-From:
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kennep <kennep@mail.alum.[Spamcake]rpi.edu>
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Reply-To:
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<kennep@mail.alum{Spamless}.rpi.edu>
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Viewed:
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889 times
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I did some reading... I think the "adder-subtractor" name must come from the fact that the output to the two wheels is (A+B) and (A-B). This is a pretty cool assembly...
Another cool one I read about that involves differentials went something like this: Ratchet each of the axels coming out of the differential in opposite directions, so that when the motor runs forward one axel turns, and when it runs in reverse the other one turns. This way you can "split" a motor to do two separate tasks. Of course, only one can go at a time... But with the 3-motor restriction, this might be a trick worth having in your bag.
-kennep
---------- Original Message ----------------------------------
From: "Philip Ogston" <ogstonpj@worldnet.att.net>
Date: Thu, 20 Jan 2000 05:06:07 GMT
> Differentials are spiffy, huh? Even better, with two differentials you can
> make a device known as an "adder-subtractor" which allows one motor to drive
> two wheels at the same speed, in the same direction, and another motor can
> drive the wheels in opposite directions.
[...]
> -Phil
> ogstonpj@worldnet.att.net
>
> P.S. "Adder Subtractor, what's that got to do with it?" I hear you ask...
> Apparently this device was originally used in mechanical computers and adding
> machines. You see, if you put motors on the wheel axles and wheels where the
> motors were, one wheel spins at a rate which is the sum of the motor speeds and
> the other spins at a rate which is the difference. So now you can be a
> mechanical engineer _and_ a computer scientist.
>
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