Bridgeport servo motor selection

[Davek0974]

Collin,

I am pretty sure the 750W is enough since you are going to gear it.

I did my BP conversion just over a year ago, all motors etc from BST on Aliexpress, great guy.

I used 750W AC servo with 2:1 reduction on X & Y, 400W with 2:1 reduction on Z, I still have not even made these motors warm up yet, I doubt a Bridgeport is going to be able to take a big enough cut to even bother a 750W motor.

My spindle is a 3kW investor rated motor, not a servo but I added an encoder and can do rigid tapping very nicely at lower speeds. Top speed is 4000rpm, bottom without back gear is 300rpm.

I am just adding another 750W servo to the knee so i can send it tool length compensation and keep all the quill travel for the work.