Hi, I'm trying to choose the right motor for a test rig I've built. I have a shaft attached to a cylinder that weighs 6kg, and I need to know how much torque would the motor I'm getting need to be able to produce in order to rotate the cylinder at 100RPM. My attempt: Torque = Force x r where r = radius of the cylinder = 0.08m Force = mass x acceleration where mass = 6kg accel = velocity/time velocity = r x ω (rotational speed) where ω at 100RPM = 6.28 rad/sec So v = 0.08 x 6.28 = 0.5 m/s Therefore accel = 0.5/t Therefore T = 6 x 0.5/t x 0.08 = 0.24/t Nm Is it as simple as this or is there more to it? And how do I know what t should be to work out the acceleration if all I know is what velocity I want it to rotate at? Would every motor have the acceleration spec listed with it or something? Thanks in advance.