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Unread 25-01-2014, 22:49
David Fort David Fort is offline
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How much force do you REALLY get?

We understand the math (and the tables) for calculating force from a pneumatic cylinder, but we seem to not be getting it.

We have a 2" cylinder at 60 PSI and expect to get 170 pounds of Retract Force not counting whatever friction and stuff.

In a fairly unscientific test, we are getting less than 100 pounds of Force.

(The test is more or less connecting a rope to the Yoke, and having it pull down on a person standing on a bathroom scale).

There are a couple pulleys in the setup, just to guide the rope to the right place (no mechanical advantage/disadvantage). Supposedly high quality, but small, pulleys, which put a Z bend in the rope.

Does anyone know how much less than "theoretical" is the force typically achievable with a pneumatic cylinder?

Any suggestions for things we might be doing wrong?

Thanks!