I never have, but I've run across a screamin deal on an identical one (Bosch SE B04 size) to what I have on a Deckel mill, and tempted to buy it as a spare "just in case". And yet these things may be so reliable it may be silly to buy it really. Out of 200+ CNC machines that have passed thru here in the past decade I only recall one bad axis motor and it was a DC type.
So, have you ever had an AC axis motor fail and if so, why do you think it happened...coolant ingress, high hours, manufacturing defect...or ??
So, have you ever had an AC axis motor fail and if so, why do you think it happened...coolant ingress, high hours, manufacturing defect...or ??