I was a little worried about my spindle overheating so I glued a heat sink to the motor and then put a standard 12v PSU fan on the heat sink and wired it all up to turn on automatically whenever the spindle motor is turned on.
Is there any point in putting aluminum heat sinks on the motor with
heat conductive epoxy? The stepper motors (that never overheat) have
clamped on heat sinks. Wter cooling would be more work but i can do
that when i get back to my real shop.