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Unread 23-01-2005, 06:36
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Re: How to use multi-positioning?

Quote:
Originally Posted by Matt Fultz
Chris Fultz and I sat down last year with a proposed idea on these Forums for multi-positioning, and made it work. There is a white paper here:

http://www.chiefdelphi.com/forums/papers.php?&categoryid=2&action=display&perpage=10 &sort=date&direction=DESC&page=3
7th down on the page

If you have it figured out, this may not help much, but it really worked for us.
That powerpoint depicts it rather well, although the second solenoid blocking off the outputs can be eliminated, thus simplifying the system. You can do this by using dual solenoid (three positon) valves in which the center position is blocked, then you can cut off the exhaust air from coming out by not enabling either valve. We did this successfully last year for two of our cylinders, our boom to hang and a caster that picked up one end of our robot to help us turn.

Quote:
Originally Posted by russell
So has anyone mad much luck using the magnetic switch things to make the cylinder stop somewhere along the length? Like we are looking at using such a system for autonomous stuff, and I would like to have two pre programmed stop points along the cylinder so we would essentially have four different positions we could put it in.
I have not tested using magnetic reed switches combined with multi-positioning, although it is possible - just expect a rather large margin of error. The reed switch would only sense it briefly before it passed by, so you would half to plan for this in programming. Also expect that it will be a little ways past (possibly even a couple inches) depending on your cylinder, pressure, and if you use flow controls.

If the cylinder wern't using flow controls and was moving too quickly then you might have issues with the reed switches never seeing the piston go by, but as long as you had it at a reasonable speed this shouldn't be a problem.

I wouldn't try and use reed switches combined with multi-positioning in order to operate something during autonomous because it wouldn't be all that accurate or dependable, instead I would say you would want to use actual three position cylinders.
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