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Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: ShowNoMercy » Sun Jun 10, 2007 8:24 am

I was wondering what kind of force would be placed on a sear holding a 1 inch piston back from say 80 psi? I know I should know how to figure this out but I am drawing a blank here. So any help would be appreciated.
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 10, 2007 8:43 am

surface area of piston x pressure = (0.5" x 0.5" x 22/7) x 80 = 62.84 lb
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Unread postAuthor: ShowNoMercy » Sun Jun 10, 2007 8:54 am

Thanks a lot, regular cold rolled steel should have no problem with that riight?
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 10, 2007 8:56 am

it should be ok, if in doubt you could always hang 62.84lb of weights from it to simulate the strain caused by the pressure.
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Unread postAuthor: ShowNoMercy » Sun Jun 10, 2007 8:58 am

I think I should be good, Im planning on making something similar to the HEAR valve.
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Unread postAuthor: Hawkeye » Sun Jun 10, 2007 9:32 am

You can always anneal a section of a metal file and shape the sear from it and then re-temper it. Very easy to do and you don't have to get it perfect. It will wear better as well.
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Unread postAuthor: VH_man » Sun Jun 10, 2007 9:51 am

shouldnt the equation for the force be

(Pi X Diamter of the piston) X pressure of the cylinder?

that would be 3.14in2 X 100 PSI, wich would mean : approximately 314 pounds of force.

314 is alot of force, but ive seen pneumatic cylinders with a 1 inch bore that have bent 1/4 inch steel.......
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 10, 2007 9:59 am

VH_man wrote:shouldnt the equation for the force be

(Pi X Diamter of the piston) X pressure of the cylinder?


No.

Force = area of piston x pressure acting on piston = pi x radius squared x pressure
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Unread postAuthor: VH_man » Sun Jun 10, 2007 6:14 pm

ah. that makes sense now......

that helps me alot... wow now i have to re-examine the actual strentgh of my robotics project.

pneumatic rams are powerufl, but apparently ive overestimated their strenght.... dang nabit......
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