ken writes:

My boss's big complaint against CNC's is
this power supply problem

You should be more specific. In what regard? The controllers, the servos,
and the machine spindle would all be separate power consumers with
increasing expense to back up.

A lot of electronics failures are blamed on bad power, when they're just
poorly made to start with. Convenient excuse for the manufacturer facing a
warranty claim. This has been going on since the early 80s when the phony
power filtering racket got its start as an add-on to PC sales when margins
started to shrink after the initial IBM PC blitz. Lots of propaganda.