Diameter or Pitch of Threads:
1. Check to be sure a matched set of Thread Rolls of the proper specification are mounted in the correct arms in the Roll Head.
2. Be sure the Roll positions are properly matched by looking at their alignment markings.
3. Be sure the diameter of the piece is correct before rolling the thread.
4. Make sure the Positive Stop tension is properly set on the cross slide.
5. Check the distance between the rolls to be sure it is correct for the thread being rolled.
6. Check the vertical alignment of the Roll Pins in each arm.
7. Make sure the Rolls stop at the centerline of the piece and dwell for the correct time.Damaged Thread Rolls:
1. Be sure the diameter of the workpiece is correct before threading.
2. Be sure the Thread Rolls are properly matched and positioned in the head.
3. Be sure the Roll Head is properly mounted and aligned with the workpiece horizontally and vertically.
4. Check the vertical alignment of the Roll Pins in each arm.
5. Make sure the correct Thread Roll cam is mounted and properly secured.