Fanuc alarm SP9046: THREAD CUTTING 1-ROT POSITION CODER ALARM
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
During thread cutting, the one-revolution signal of the position coder could not be detected when required. The once-per-spindle-revolution reference is essential to synchronize tool feed with spindle angle; losing it mid-thread would ruin the workpiece, so the drive aborts immediately.
Likely causes
- Intermittent mark-channel connection on the position coder cable, aggravated by vibration
- Coder disk mark contaminated or sensor air-gap drifting with temperature
- Noise on the coder line from unshielded routing near power cables
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A860-0360-B101
Position coder (spindle encoder) · Common cause
Need the part urgently?
Send us alarm SP9046 with your machine details — typical RFQ turnaround is 24–48h.