Hey just noticed from your comment we have a similar interest.
I also have just recently done a retrofit and built my own router table, design was my own including electronics, drivers, controller the works. Steppers, not servos, since I have had zero servo experience.
Currently I am fighting an electrical noise issue of some type. I initially thought it to be from dirty brushes on my Frued 2 1/4" router but have ruled that out. I now suspect a grounding issue of some type.
What did you do to properly ground out your setup?
What did you retrofit? You on cnczone? I'm flateric there too but mostly lurk since I am sorta self taught and probably couldn't contribute much to them anyways.