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Some time ago someone mentioned that switching power supplies could be troublesome in CNC tooling. Why? As long as the supply is not one of those that requires some minimum current, why would it matter?

Switching supplies are commonly designed to supply current to a steady load.
Chopper type stepper drives draw current in a very unsteady manner. This can
cause the regulation circuitry fits. Jon Elson (I think) posted a pretty
good technical over view of why it can be a problem. It can also work right
out of the box in the right circumstance and at other times be made to work
with the addition of capacitors and/or resistors. I personally recommend
that beginners just use a linear supply (transformer, rectifier, capacitor)
to start with because it eliminates the possibility of problems. When you
are starting and most likely to experience erratic behavior using a linear
supply is a good way to factor the PS out of the possible problems.

Tim
[Denver, CO]