Torque / Speed curves for different Spindle Types

[Chaz]

Depends on how he's doing it I suppose. What's acceptable to him might not be for you.!! . . . I definatley wouldn't replace the main spindle with a 2.2Kw spindle has it will spoil the machine but would possible use it to drive the main spindle with a ratio to increase torque and lower 2.2kw spindle speed to match Main spindle bearings.?

If you want to try this I can lend you a 2.2Kw spindle and VFD. Thou it would be a lot work to find out it's not much good.!!

I was thinking to gear it 10:18. I suppose I could find a different belt / pulley setup. This is the smallest I can find (easily) to go (10) using the stock setup.

This lowers the speed to almost half and should therefore provide almost double the torque. Its a pity that the removed Servo motors are a bit small, else they would be ideal, specifically with closed loop control. They also do 8K RPM, worth a look at all?