PwnCNC and the XYZ touch probe

[Aiph5u (Aiph5u (not affiliated with Onefinity))]

Hey Mrd,

The spindle should not be grounded through the machine chassis!!

It should be grounded through the PE (4th) wire in the spindle power cable! Never connect a spindle without a PE wire!

Even if PE wire and cable shield are both connected to ground, they serve two different purposes. PE is crucial for electrical safety, and shield cannot replace the PE wire!

@Aiph5u

@Aiph5u

Image 1: A typical spindle cable for use in a power chain (LAPP ÖLFLEX® CLASSIC FD 810 CY )

See this thread for more information.

Note that even if PE wire and cable shield are both connected to ground, they serve two different purposes. PE is crucial for electrical safety, and shield cannot replace the PE wire.

If you bought a cheap Chinese spindle, you should also be sure that in the spindle the PE (fourth) pin of the spindle socket is actually connected internally to the spindle housing, as seen here. You can check this with a multimeter (set to ohms/resistance, the resistance between the PE wire and the housing of the spindle must be close to zero).