I have a older 3 axis Cincinnati vertical machining center that was retrofitted with an A2100 controller approximatley 14 years ago. Over the past 4 months I have been experiencing an intermittent z-axis following error. It occurs on a 3 axis move with a ball nose tool. The tool will drop suddenly and create a small divot in the part but the system will not alarm because the following error is not reached. Typically mid way through the next pass the z-axis drops once again and the system shuts down and a following error alarm is displayed. The part is typically a complete loss. I thought it may be a corrupt program but I ran the same section again with no problem but as it moved on to another part of the program the same problem occurred.
Any insight you can provide would be greatly appreciated.
Regards,
J.Rice