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The last several years of my dad's career was spent programming to millionths of an inch and routinely hitting 100's of thousands with the EDM. (Tooling and molds for aircraft grade switches, etc.)
How about looking for an arcing contact in a thermostat? Or, bad connection to a heater terminal. (Arcs produce a great deal of RF interference.)
Yes, each major machine in the shop should have it's own ground. Some things to look for,
Grounds shared by separate circuits.
In the sub-panel, the neutral bus should not be bonded (connected) to ground at the sub panel. There should be a neutral wire (bonded to ground at the service panel) and a separate ground wire feeding from the service panel. Only the ground wire bus should connect to the chassis of the sub-panel. If this does not make sense, consider having a licensed electrician look at the situation...
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