Subject:
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Re: robotic rovers
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 2 Sep 1999 15:56:09 GMT
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Reply-To:
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nospam-dcchen@pacbell.net/StopSpam/-nospam
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Viewed:
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750 times
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I had written:
> > I had thought of one that could work, but haven't applied it yet. It
> > goes like this:
> >
> > Given an AB steering system (ie. each side controlled by a separate
> > motor).
> >
> > Wheel A <---- Motor A ----> Differential <(inverted)- Motor B ---->
> > Wheel B
> > ^
> > Clutch (that can lock up this Differential)
> > +-----Motor C
> >
> > 1) When going straight, the clutch is locked to the differential case
> > preventing it from rotating and effectively locking A in step with B.
> > 2) Before turning, dis-engage the Clutch with Motor C, now A and B turn
> > independently.
> > 3) Do your turn.
> > 4) Re-engage the clutch before going straight.
> > 5) Go straight. • to which alex wetmore wrote:
>
> It sounds like you guys are trying to re-invent the adder/subtractor system.
> Check out http://www.phred.org/~alex/lego for some designs using this.
Yeah, I suppose you are right. I think the only advantage to this
scheme is that you can use a micro motor to power the clutch mechanism
to that you don't tie up a full size motor. Also if you are running out
of motor outputs, you can use a sensor output and toggle the micro motor
on and off by setting the sensor mode from an active type (ie. light
sensor or angle sensor) to a passive type (switch, edge detection, temp,
etc). This allows you to preserve the port as a sensor input at the
same time as it is possible to multiplex both functions. See my
previous posts on the subject: Use a RCX as a Sensor port AND a Motor
Output!
(which actually should have read Use RCX sensor port as a Sensor Port
AND a Motor Output! oops :)
Dave
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Message is in Reply To:
 | | Re: robotic rovers
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| It sounds like you guys are trying to re-invent the adder/subtractor system. Check out (URL) for some designs using this. In an adder/subtractor you have two motors, A and B. The wheels are then run through a mechanical linkage such that one wheel (...) (25 years ago, 31-Aug-99, to lugnet.robotics)
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