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Unread 04-08-2010, 21:28
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Re: Drive train questions

Quote:
Originally Posted by Al Skierkiewicz View Post
B,
There is nothing that prevents you from using two cylinders in series to obtain a three position mechanism. Apply air to one for the middle position and both for the fully extended.
If you make these cylinders of two different lengths, you would have four positions - both rectracted, short one extended, long one extended, both extended.

Stopping a cylinder in mid-stroke is fairly straightforward by using a 3-position solenoid valve. Center position is all ports blocked, so the cylinder is pseudo-locked in position, although with some spongyness. With the right position feedback, programming, and flow controls, you could move to any variable position.
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