I have a PM-25 that I have added a CNC kit to. Over the steppers I screwed on some galvanized sheet metal as a cover (into the mount, not the motor). I was touching the sheet metal over one stepper while jogging the same stepper and received a fairly good shock. Now, there could be something wrong with the wiring, or maybe not. Regardless of that issue, What I did find was the ground pin of the power cord did not show continuity to any part of the machine except the electrical box. The neutral pin does show continuity. The whole machine should be connected to earth ground to prevent shock, correct? This machine has a ground connection to the electrical box. The painted electrical box is connected to the machine with what looks like plastic spacers. I don't think it is making a connection. I'm fairly certain I need to add more green wire to ground the rest of the machine. My other concern is whether this stepper is defective. Under what circumstances would the stepper produce a shock while being energized? Would this require a bare wire to be contacting the housing, or would the motor induce current in the surrounding, non-grounded sheet metal?