Bridgeport info

Hi all,

I networked some friends and finally spoke with a guy that is well versed
on Bridgeport (factory) CNCs.

The Type 1 vertical mill (basic 2000 lb job) used zero backlash ball screws for maximum
efficiency of motor torque to useful table movement.

The stepper based units used 800 in-oz torque motors at 1:1 belt drive
to the leadscrew, a bigger motor on the knee. Wow at's big!

The motors are sized mostly for table and load acceleration, not cutting load.

On any machine, if you are cutting curves, the zero backlash and proper
adjustment of gibs is required. Note you have to order your ballscrews with
zero backlash nuts... it ain't standard.

I have a lot more technical notes and will have to study them to make more sense.

Tom