Lindsay PS The motor does seem underpowered and with 6mm endmills cutting wood I only cut at depths of 1mm with a max federate of 400mm per min. It gets too hot and I think it is meant to be used with the mount which acts as a heat sink. If you put it on a home cnc you will need to manage the heat somehow. In my case light work seems to have melted the fan on the shaft. Awesome. Also the fan is a hazard and though I thought I had secured the wires out of the way, they ended up wrapping around the fan and stalling the motor. Shutting it off in 5 seconds seems to have saved the motor, maybe..

Lindsay Add to that: repeatability is about /- 30 microns or 3 hundredths of a mm.After receiving a metal splinter, I went over the unimportant edges with a file to remove burrs and sharpness. It has been very good for CNC work.

Lindsay 1.5 Amps does not mean 1.5W. There is probably around 2V across the diode, therefore the wattage of your old one may have been around 2.5W. How much current does this one draw?