Subject:
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Re: Working around the 3 output limitation
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 7 Jan 1999 06:35:11 GMT
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Reply-To:
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BRETT@SR.HPstopspammers.COM
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Viewed:
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1076 times
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John A. Tamplin wrote:
> You can also use one motor (or "half motor") to change gears to > redirect the output of another motor to numerous other things,
> but only one at a time. ... You need some way of telling
> where that shifter is, so you probably need one or more touch sensors
> (from what I have seen relying on timing will eventually get you in
> trouble, the motors just aren't that precise) ...
I've got an working design that SEEMS to get around the problem of
cumulative error. I use a gear plate that sits atop a regular gear.
Since it's held in place by gravity, when it hits the limit of travel it
simply slips. This allows me to "reset" it's position by running it one
way long enough to be sure it's slipped a few times. I can then run it
a known distance to engage the selected drive train. As long as I
"reset" it for each change it stays pretty accurate.
--
Brett Carver
brett@sr.hp.com
(707) 577-4344
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Working around the 3 output limitation
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| (...) Another option is to use "half motors" -- ie, if you are using 360 degree 4-wheel steering and driving all four wheels, those drive wheels never need to go in reverse. You can use a differential and two ratchets to separate the forward motion (...) (25 years ago, 6-Jan-99, to lugnet.robotics)
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