Hello. Firstly, I am new to the forum. I know this horse has been beaten for some time now. I will try to remain to the point.

I purchased one of those Chinese spindles from Amazon. I haven't checked yet, but I believe that like everyone else, my ground is not connected. A piece of paper that came in the package says specifically NOT to ground the spindle, otherwise damage will occur when cutting metals. I will update (when I get home) exactly what the paper says. I also noticed that the ground terminal on the VFD has red paint on it.

So the questions are;
-Why would it be advised to NOT ground the spindle?
-If I do take steps to ground it, how could this be bad?
-Is it possible the VFD isn't wired properly to handle a ground connection? (I mean by design..)

Ultimately, I am concerned that there is no ground, and apparently should be no ground.


SPINDLE KIT DETAILS (copied from amazon title):
RATTMMOTOR 1.5KW Air Cooled Spindle Motor ER16 CNC Kit + 1500W 1.5kw Inverter Variable Frequency Drive 220V + 80mm Clamp Mount Bracket for CNC Router Engraving Milling Machine

Nick