Re: ball screw help/suggestions
A reduction drive (belt or gear) also changes the torque
A 3:1 Motor:Screw drive will result in 1/3 the RPM (eg motor RPM 3000, screw RPM 1000) but will triple the torque (e.g. motor torque 4nM, torque at screw 12nM.
So often a smaller / less powerful motor can be used.
There are also changes to inertia, the physics of which I do not understand.
A reduction drive substantially reduces the inertia that the motor 'sees'.
Rotational inertia of large ball screws is an issue - requires a lot of torque to get the screw moving.
7xCNC.com - CNC info for the minilathe (7x10, 7x12, 7x14, 7x16)