Sigma stepper motor info

Hello to the group. This is my first post here... I'm in the process
of gathering parts to convert a HF mill drill to CNC. I got some
stepper motors from the local scrap dealer. I've done a search on the
web, but I'm having trouble finding info on the particular motors. I
need to find out the voltage and current requirements, and torque
ratings. Any help would be greatly appreciated.This is what I have:

1) Sigma Instruments Sigmax
4 wire
Part number 802D2-62B022BW
Size NEMA 34 6"long, .500" shaft
Date 3/6/87

2) Sigma Instruments Sigmax
4 wire
Part number 802D3451?02BW
Size NEMA 34 5"long, .500" shaft
Date 3/10/87

3) Pacific Scientific Sigma Sigmax
8 wire
Part number E32NRFP-LDN-NS-00 replaces 802D3437-F05BS
Size NEMA 34 4"long, .375" shaft
Date code 9110