Fanuc Parameter 8901 Better May 2026

For high-precision mold making or aerospace components where surface finish and dimensional accuracy are paramount.

When 8901=0, the CNC uses "Exact Stop." The machine finishes block 1, stops entirely, reads block 2, accelerates, stops, reads block 3...

Better is not a universal number. It is: fanuc parameter 8901 better

Always test with an air cut and a thread go/no-go gauge after changing. And remember: Parameter 8901 is write-protected (requires PWE = 1) and often requires a power cycle to take effect.

If you truly want the best behavior, combine 8901 with Parameter 4000#2 = 1 (high-speed rigid tapping mode) on 31i-B5 controls. For high-precision mold making or aerospace components where

Final note: “Better” without diagnostics is guesswork. Use FANUC’s Servo Guide or look at Diagnosis 300 (synchronous error) before and after changing 8901. The goal is minimum following error difference between spindle and axis—that is the true measure of “better.”

If you tell me your Fanuc controller model (e.g., Series 0i-MF, 16i, 30i) and the current value of parameter 8901, I can give a precise interpretation and recommended value for your setup. When 8901=0, the CNC uses "Exact Stop

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