Hi, I am in the process of designing a machine to make overwrapped musical instrument strings. I need to size the drive motors, and determine how fast the machine can wrap the wire on. To do this I need to work out the torque required to bend the overwrap wire onto the core. The machine will tension the core wire and rotate it in order to wrap on the over-winding which will be fed in under tension. So the motor that drives the core rotation must do work to deform the wrap wire onto the core. The size and spacings of the wire are both variable, so I'd need to work out the formula. The winding wire will vary in proportion to the core from about 1/10th dia to a similar diameter, so the deformation in some cases is quite severe. The wire I'll be using will be a soft and ductile brass wire or pure copper wire for the wrap. The core is 60:40 hard drawn brass wire. I probably only need a ball park figure for the torque required, enough to choose a motor size and any gearing. Unfortunately I am not a mechanical engineer - my skills are in Radio electronics engineering and instrument making though I ought to be able to follow some equations and concepts Google has let me down here, and I need some guidance - thanks for any thoughts!