how to find torque of a rotating actuator shaft..

am doing a project on developing a instrument helps finding the torque value of a actuators rotating shaft before fitting it to the valve ....

Comments

[lemonie]

What units are used to quantify torque...?
You could build a length-weight rig (pic), but be warned that if you test things to their limits you put them under maximum load/stress.

L

[seandogue]

Pardon, but why do you need to determine the value empirically for end-use? I would simply use the actuator mfg data to determine the baseline and make sure I choose an actuator with slightly more torque than is required. It's final strength can be modified by use of PWM or similar.

[steveastrouk]

Sounds like he wants to know if its the RIGHT torque, so the actuator will operate the valve.

[seandogue]

Understood, not taking issue with your suggestion, but still, the problem sounds like an issue of finding out the required torque for the valve, rather than that supplied by a rotating actuator (presumably a rotary solenoid or similar), which can be specified to a vendor or selected from a catalog or website, prior to purchase, once the required value is known.

[steveastrouk]

Ah, I've read it bass-ackwards.
Agreed.
Steve

[steveastrouk]

React it against springs in a rotating frame, measure the displacement.