Thanks for the replies Jon and Ray. Like Ray said, I was wrong about the servo drivers, they have PWM inputs instead of the analog inputs, which is even better. So it looks like the Universal PWM controller would be a better fit, plus it has the DAC option for the spindle VFD. It would be nice to have another for the three phase coolant pump VFD too. I will need more digital outputs. Another printer port may do the trick here? Each axis and the spindle have a tachometer and a resolver. I am planning to replace the resolvers with encoders, but is there any reason to keep the tachometers? Removing both, plus the gearbox they are mounted to, would free up space for a proper encoder, it seems.
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