These are more pictures of my Bridgeport CNC Conversion.

The mill is a 1963 J-Head Step Pulley Mill that was a Government
Surplus mill. The CNC Conversion consists of the following elements:

1200 oz/in Stepper Motors (X and Y)
400 oz/in Stepper Motor (Z)
G201 Gecko Stepper Drives (X, Y and Z)
PMDX-135 Power Prep Module
PMDX-131 Breakout Motherboard
60V Toridal Transformer
HP eVectra Computer
Hitachi VFD

I was very fortunate that my mill had a NEMA Enclosure attached
to it that used to house all of the large contactors. I gutted 
this box and installed all of my components. The VFD is actually
fastened to the back of the NEMA enclosure.

Image 1-4 show the Z axis conversion I used. I have been very diligent
to not change major elements of the Mill to add the CNC Conversion. I am 
using a 4:1 gear ration for the Z Axis. 


Mike Hoffman
     of
Hoffman Mechatronics

mike_hoffman at verizon.net