Subject:
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Re: rotation sensors and input limitations
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 12 Feb 1999 22:24:07 GMT
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Original-From:
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John A. Tamplin <jat@Traveller.COM&spamless&>
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Viewed:
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1917 times
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On Fri, 12 Feb 1999, Bryan Beatty wrote:
> ...Basically, you take advantage of the slipping belt so that every time
> you need to switch axle positions, you "re-zero" the axle position
> against the physical limiter at A. Thus, any errors of motor position
> do not accumulate; the only error is whatever builds up in rotating from
> A to B or C, once. The tolerances on the motor and on the positioning
> of B and C are probably good enough for this to work.
Another possible error is slippage of the belt (aside from when you want
it to slip at end-of-travel). I haven't played with belts & pulleys much
because when I did at first I found slippage to be a problem. Am I missing
something or are you saying it is a reasonable tradeoff for not using a
sensor input?
For my particular application, this won't work since your approach
requires the shifting mechanism to turn both directions and I only have
"half" a motor available for shifting. However, if the belt slippage
isn't a problem (or what you are moving doesn't have much of a load) I can
see other applications where the sensor input is more important than half
a motor output.
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 has 1 Reply:
 | | Re: rotation sensors and input limitations
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| (...) Well, it does have the limitation that you can't have a lot of torque on the "switcher" shaft, but for some applications that may not be a big problem. It all depends: 1. how much torque do you need to rotate the switcher shaft, and 2. how (...) (26 years ago, 13-Feb-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: rotation sensors and input limitations
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| (...) You've come up with an admirable solution to the problem! Here's another idea, one that works on a general class of problems and doesn't require any sensor input for controlling motor positioning: The general problem class is one where you're (...) (26 years ago, 12-Feb-99, to lugnet.robotics)
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