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Probe Failure to Trigger

New user here, still running into hurdles. I’m running a program that has successfully run in DCC mode on a previous part, loaded a second part and the probe fails to trigger after the alignment. I first probe 4 points to establish my Z plane, 4 points around the OD of the part to establish my X and Y zeros, do the alignment and then start to probe points for a second plane. The probe is moving vertically towards the surface but it fails to trigger. It keeps moving in the Z negative direction until it alarms out. Any help appreciated.
Thanks, Glenn