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Perhaps TLG should be meeting companies that produce valves of the same
quality as those mentioned. It also sounds like the timing belt used for
the test bed could be replaced or reinforced even more.
--
Cheers ...
Geoffrey Hyde
"Xanthra47" <jmantor@nycap.rr.com> wrote in message
news:GAqEyB.63x@lugnet.com...
> Yep, and if you combine those high-speed, high-precision pressure
> regulators with low stiction cylinders and a fast PID controller you can • get
> even better accuracy and repeatability. When I was working for an encoder
> company, I scavenged some parts from another project and played with them • to
> see just how accurate I could get and I used their laser test bed (for
> characterizing micron-resolution linear optical encoders) to measure my
> errors. I found that pressurizing both sides of a double acting cylinder
> with seperate regulators and using an embedded 386 to control the system
> worked very well... better than .1 mm. In fact it was easier to move
> quickly and hit a target location with the pneumatics than it was with the
> timing belt drive system the test bed currently employs. The timing belt
> stretches considerably under high accelerations even though it's • reinforced
> with a steel cable
>
>
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