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How do you calculate the torque of a brushless dc electric motor? How do you calculate the torque of a hydraulic motor? How do you calculate the push and pull force of a double acting hydraulic cylinder?

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This question has nowhere near enough detail. All these things would probably normally be measured - if you want to ask how to calculate them, you're going to have to give us something to work with. What values would these calculations be based on? Also, the fact that it's a particular kind of motor is pretty irrelevant as far as the physics is concerned, so I'd suggest leaving that out and seeing if you still have a question. If you're confused about what you should really be asking, I'd be happy to discuss that in Physics Chat. – David Zaslavsky♦ Aug 27 '11 at 22:57
For a double acting cylinder, is there an equation to calculate torque,pushing or pulling force, given the pressures on both sides of the piston, piston diameter and cylinder diameter. – exosuit Aug 28 '11 at 2:10
You can edit the question to reflect that, but you'll need to describe in some detail what a double acting cylinder is (and how the various measurements fit into it) if you want this considered for reopening. – David Zaslavsky♦ Aug 28 '11 at 2:35

closed as not a real question by David Zaslavsky♦ Aug 27 '11 at 22:55

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.