is it quick enough to pick up the change in spindle speed as cut starts? Im looking at as high a speed and max depth of cut as possible.
Well I am not an expert but if your spindle has enough torque it should not slow down under normal threading use. EMC (LinuxCnc) is very fast and can handle fast encoders I take it you will use a mesa 5i25 with a 7i76 or similar I also have put to jog wheels on to use the lathe in manual mode. Perhaps you should ask your question over on the linuxcnc forum for the correct cards especially if you want a tool changer as well. I will follow your conversion with interest