A BLDC drive from Anaheim Automation is tested as a replacement to stock spindle drive of the PM25 mill. The stock drive is not documented, lacks a fault signal, and responses slowly to direction and speed changes limiting rigid tapping. The Anaheim Automation MDC300-120151 drive has advantages but with the stock PM25 spindle motor, there are some gotchas including poor torque at low speeds, poor speed regulation, and a few others. I’m still looking for a suitable replacement for general use.