Fanuc alarm SP0740: RIGID TAP ALARM : EXCESS ERROR
spindle alarm (rigid tapping) · Fanuc 0i-D
What it means
During rigid tapping, the spindle positional deviation while the spindle was stopped exceeded the value set in the rigid tap parameters. This typically appears at the start or end of a tapping cycle when the spindle fails to settle onto its commanded position. It indicates a mismatch between spindle and Z-axis servo response rather than a hard hardware failure.
Likely causes
- Rigid tap position gain parameters (No.5280-series) poorly matched between spindle and tapping axis
- Excessive mechanical friction or sticking tap in the workpiece
- Spindle orientation drift near cycle start
- Loose spindle-to-position-coder coupling
Triage note: Tune rigid tap gain/time constant parameters and verify mechanics before touching hardware.
Need the part urgently?
Send us alarm SP0740 with your machine details — typical RFQ turnaround is 24–48h.