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#1
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Re: Pneumatic Confusion
Lots of options for 3-position, closed-center valves. The hardest part is finding them in 12 VDC. Try Grainger Stock # 2G449, an ARO A312SD-012-D valve, about $114 in my older catalog. Or # 4TR82, about $100.
I didn't see anything in McMaster-Carr, but just did a quick look. You don't have to use SMC - if they are backordered, go to another vendor (this is just like real engineering life; things you need are always unobtainable). These valves are great additions to the legal parts - energize one solenoid to extend, energize the other to retract, and de-energize both to hold position. |
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Re: Pneumatic Confusion
Alrighty, thank you very much people for your help, I had what I needed to make the presentation. Thanx!
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#3
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Re: Pneumatic Confusion
cyberguy: i would recommend considering a lead screw for your design. the system would probably be heavier than a piston, but the functionality is very similar. the torque on the arm, or the force of the screw, would be close to if not more than that of a piston. it allows you have any position within its boundaries, and it can easily be encoded with a potentiometer. my team is planing to use one for the lower stage of our arm.
for those with experience with multi-position pistons: how firmly is the piston held at intermediate positions? the only way a normal piston stay rigid is by applying excessive force in one direction, mechanically locking it in place. if the piston is held midway between the extremes, wouldnt it act much like a pneumatic spring, or shock for that matter? |
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