I have a stepper-driven 3-axis machine using 305 oz-in steppers and Mach 3. It runs relatively well but loses steps and stalls unpredictably. I'm trying to use it for production and the intermittent stepper issues are unacceptably unreliable. Anyone have a suggestion for a "turn-key" servo upgrade? I don't need more power or speed, just better dependability. Suggestions on appropriately sized motors and drives would be appreciated.