Hello, 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.