Subject:
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Re: Two more for the wish list
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 28 Jan 2001 20:27:44 GMT
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Viewed:
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852 times
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A few months ago I built a model of two synchronized metering pumps, one for
nitro-goo and one for glycerine-goo. The idea was to have both pumps
synchronized. I did it with a differential and a rotation sensor to mark
the difference and a controller to slow down the faster pump. So I could
watch the exact position of the differential body and watch the *zero* count
simultaneously (ranging from -1 to +1). I noticed the missed counts, where
the body would shift by 20 or so degrees while the 'count' centered at zero.
I attributed the missed counts to a control system like OnFwd(10) Wait(10),
that caused a lot of vibration. On the average, I got about 10 minutes of
ops between missed counts. OK for keeping a robot in a straight line but
not good enought to compound nitro-glycerine :-).
Regards, Jerry
In lugnet.robotics, sjbaker1@airmail.net writes:
> Jerry Kalpin wrote:
> >
> > Matthias, this is easy to do without a new part. You use a normal
> > differential, put one shaft in one side, the other shaft (but reversed) in
> > the other and connect the rotation sensor to the output. You get a positive
> > count if the right wheel is going faster and a negative count if slower.
> > However, a differential with a reverse feature on one input would be great.
>
> Yes - but if you've been following the discussions about dropped counts,
> you'll know that the standard rotation sensor is pretty inaccurate when
> you set it up like that. It likes nice *fast* rotation rates.
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Message is in Reply To:
 | | Re: Two more for the wish list
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| (...) Yes - but if you've been following the discussions about dropped counts, you'll know that the standard rotation sensor is pretty inaccurate when you set it up like that. It likes nice *fast* rotation rates. (24 years ago, 28-Jan-01, to lugnet.robotics)
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