I have a Luxcut BF 54V (which is a rebadged Optimum BF46) which I am accumulating the necessary hardware to CNC this machine.

I am going to use DMM servos, a set of ballscrews by RSK which will bolt in place of the original screws.

Two of the things I am looking at are,

1/ Machining the ways and fitting linear rails, the CNC version of my mill has linear rails for the column.

2/ Changing out the existing spindle motor and fitting a AC Servo, as I wish to be able to tap and thread mill, and in the future possibly fit a auto tool changer.

The existing motor is a 2.2kw BLDC, the same as this one.
2200W REPM Brushless DC Motor (MBL-123IM-300HA) - China Bldc Motor, Brushless Motor

The machining I do ranges from Alloy to steel to stainless, and some of it is up around 40 RC.

I would like to be able to tap up to 1/2" UNC in steel so some low down torque is required, plus I'd like to be able to machine alloy at a reasonable speed. Does anyone have any suggestions as to what size and speed of Servo would be best to power the spindle??.......Kiwi