pneumatic question
pneumatic question
(OP)
Hello All, I'm making a little pneumatic press, I want to limit the speed of the ram so I put an adjustable restrictor in the line to the cylinder. I have set it to the speed I want, but my question is have I also decreased the amount of power the ram can do because I've decreased the speed? Thanks.





RE: pneumatic question
A little ditty that might make sense in your application. "When in doubt meter out" If you are trying to control the speed you want to put the restriction (flow control, metering device, etc.) on the exhaust side. The line pressure acting upon the cylinder piston will be whatever it is when it stops no matter if it's restricted or not. Are you trying to use speed + pressure to do the job? You may need to increase the size of the cylinder. Maybe tell us a little more about your application.
Dennis
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RE: pneumatic question
However, if you really meant to ask about force, then no, you haven't changed the force because force is a function of pressure and you haven't changed the final pressure.
RE: pneumatic question
As far as the force available it will be the same once the piston has stopped and the pressure has built up to line pressure. While the piston is moving in either case there will be a pressure drop. How much pressure drop will depend on speed of the piston, flow controls and line loss.
Barry1961
RE: pneumatic question
My question about power was because my colleague kept saying that power will not change if we change the speed of the ram, but I told him he was confusing that with force. Argument basically, just need to confirm. (P=Force*Velocity)
When in doubt meter out! Cool. Thanks
RE: pneumatic question
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RE: pneumatic question
RE: pneumatic question
Don't bother with flow controllers, just change the orifice ( needle valve)by trial and error, and once set, it will be very consistant.
RE: pneumatic question