Making a pneumatic cylinder?

Gallery, Projects and General > How do I??

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David Jupp:
Following on from John's comments above - maybe you could buy (or scrounge) an existing cylinder, then shorten tube, tie rods and piston rod...

krv3000:
HI well you may be in luck as i have sum smoal pneumatic cilenders i will dig them out and if ther any good for you you can have them at the cost of postige

loply:
Hi folks,

Thanks for all the excellent input, particularly from Lew, that document was excellent.

krv3000, I'd be interested in seeing dimensions etc for sure. Let me know.

Lew_Merrick_PE:
lopy,

I was a member of the team that wrote the o-ring section for the 1976 edition of the SAE Handbook. The material was removed from the next edition -- supposedly at the behest of Parker-Hannifen. Most of the material was kept available in the American O-Ring catalog for a number of years. When that finally disappeared, I put that document together as one area in which I regularly work is pyrotechnic actuators. Being "almost right" when sizing seals that see 65,000 psi pressure impulses is just not good enough. You have to find texts that have been out of print since the 1960's to find some of that information.

And no, such information would not have saved the Challenger. It was flexure of the Solid Rocket Booster (attach) Beams (SRB Beams) that tore the tanks and caused the LH2 and LOX to "leak" from the External Tank. Had that mixture not been ignited from the "leakage" at the o-ring joints (caused by poor assembly rather than poor design), it would have been ignited by the main plume 5-7 seconds later.

krv3000:
HI right dont no if thes will do i only have two the over all lenthe is 49 mm with a di of 5 mm the center shaft cums out by 17 mm with a di of 2 mm the cilinders is threded at the top any way sum pics o they have riten on them
S M C 4-10

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