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I made DIY controller way back, using Arduino and TB6560’s.
It would jog fine all day long but when I started a carve it would abort as soon as it started moving. (router started prior to hitting Carve).
I solved it by providing the Arduino with a separate 12V PSU.
A VFD inverter can be quite noisy EMF/RF-wize. Especially ebay items. Speaking of ebay spindles, most have 4-pin wire layout but the grounding pin is usually actually not connected to spindle ground.
That is an excellent point Dan. When I finish this pressing job (Plaques for my Sons Arrow of Light Ceremony), and I rewire. I will also rewire the limit switches with shielded cable.
I used cat 6 stranded wire and used one wire in the twisted pair for grounding and the other for connection. worked like a charm. I ground only one end. I grounded to the box not the machine.