The Gantry hits up against the Magnetic Stop Plate when Aligning the Head to ensure that the Head aligns in the correct position.
Connections:
The Magnetic Stop Plate is attached to the far left of the bottom rail.
Troubleshooting:
The cuts are way off Horizontally after changing the Head or Gantry.
Make sure you placed the pin of the Magnetic Stop Plate into the correct hole:
CMC 9000: Put pin in the right hole.
CMC Z: Put pin in the left hole.
See:
Magnetic Stop Plate Installation