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Originally Posted by andy
I do not think that you have enough compressor "umph" to efficiently implement a venturi vacuum generator. I also would quicly discount centrifigal vac pumps (there heavy- upwards 100 lbs) and turbo molecular vacs (expensive-upwards $15000).
I would try to drive a pnumatic cylinder with a cam on a motor with one way valves that seems like the easiest, lightest, most cost effective solution.
good luck!
-Andy
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But since one way valves arn't really legal either, you can use a double solenoid in place of one, as long as you know when the cylinder is extending and retracting. Rather that use a cam, why not put two cylinders parallel to each other and link them together, driving one, while using the other to generate a vacuum. As far as the practicality of generating a vacuum on a FIRST robot or the usefulness of doing so: impractical and useless, but its still interestign to discuss.