For a small, non-production, high precision CNC lathe, what sort of spindle drive motor and drive arrangement would be best?
For example, does variable speed matter?
Very slow speed, as in backgear for threading, probably isn't necessary as the XY drives can go over a thread several times, taking small cuts.
For machining operations, would a single speed be enough? Three speeds?
I was going to use an inverter and a three-phase motor, but is that overkill?
As to drives, I think belt drive is probably best, with an encoder if threading is to be done.
I'm looking for thoughts and experience, any comments welcomed.
Ta,
-- Peter Fairbrother