This week I Installed the 1kW DMM servo spindle motor in place of the 750-Watt motor I originally tried. Although not listed on their website, this motor is readily available. For reference, the DMM-Tech part number for this new servo motor is 86H-DHT-A6MK1. Fortunately, it is the same physical size as the 86M-DHT-A6MK1 750-Watt motor which makes for an easy swap.
In this video I explain the reason behind moving from the 750-Watt motor to the 1 kW motor and discuss the process used for calculating the inertia of the milling machine spindle.