NC Cams,
Thanks for information, looks like I'll buy servo amps.
The present setup has encoders mounted on the ballscrews with a tach on the motors, so I presume I will need an amp that can close the velocity loop, and then I can close the position loop in the PC.
I will be using emc2 with 2 mesa 5I20's plus their DAC and I/O cards.
I recently did a HES lathe using a similar setup but was able to reuse the Gettys servo amps, that was a 2 axis lathe plus spindle.
I find the most difficult part of a retrofit is controlling the tool turret; with this upcoming project I intend experimenting with the use of a servo motor to position the turret to gain bi-directional tool selection, and to make the job easier.
Dave |