Hello.
I will be adding a motor with belt reduction on the plasma z.
I have already done this with a pneumatic sander How to activate a solenoid at the start and end of machining - #8 by ROTM
A brush will be better for my use.no compressor starts and noise. Next is to use a dc motor with a speed controller where the brush is directly mounted on the motor. so hopefully no gear reduction is needed.
I have some 2hp and 3hp dc motor but I guess the 2hp will do.