My thought is that a stepper driver would be sufficient for a low-motion axis like what is typically used in this application. In fact, the stepper is probably the preferred type of motor with higher torque and good accuracy at these lower speeds. Far less need for an encoder etc. As long as you can reasonably mix the two types in the system, you're probably okay.
_________________ "I want to know what kind of pickups Vince Gill uses in his Tele, because if I had those, as good of a player as I am, I'm sure I could make it sound like that. Only badly."
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