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I'm designing a machine as a final assignment for my internship. It's a machine that wraps SS tubing around a cylinder, making coils.

While trying to figure out how much torque I'd need to rotate the cylinder I found that I'm really in the dark on the subject (the teacher I had didn't pay nearly enough attention to calculations like this).

I live in the Netherlands so I use the metric system. I hope that won't be too much of a problem.

Here's what I do know:

T = I x a

T = Torque

I = Moment of Inertia (mass x radius^2)

a = angular acceleration

The cylinder weighs in at 12.53 Kg and it's radius is 143.75 mm.

I don't know if I need to convert these numbers which is what's stopping me from calculating the MoI.

As for the angular acceleration, I believe that it's got something to do with difference in rotating speed and time, I just don't know what to do with those numbers either.

Max. RPM: 5

Acc. time: 5 sec.

All help/explanations are very much appreciated!

Note: I have checked out some of the existing (older) threads on the subject but that didn't make me understand things enough to base my own calculations on.

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# Torque needed to rotate a cylinder

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