How do I measure torque from a shaft?

[JD6]

Now that’s big brain. Where my PLTW POE peeps at? Haven’t y’all done that activity??

[Pat.Chet.02]

I got that done last week, I’m currently on the pulleys.
I would be farther along if we had more than 2 days a week in school to work on it.

[Hudsonville_Robotics]

I don’t mean to wake the dead but why not nudge 'em a little. This is a dyno article from 2017.

Build a Dyno

Another robot dinosaur? No, a dynamometer. A what? It’s a test machine to measure motor performance. It provides a load against the motor under test (MUT), varies the MUT’s speed, and measures the speed and torque. With a dyno you can determine the strength of each of your 393 motors, and find out how it’s geared without opening it up. There is a clamp to hold the 393 in place without screwing it down, saving time and wear when testing many motors. This simple dyno uses gravity to provide the l…

[marinmersenne]

I know this topic is old but here is a simple way with some sprockets and chain to measure dynamic torque(torque while rotating). You will need some kind of scale to measure the force on the idler sprocket and will need to do some math to convert that to torque.