What causes FANUC alarm 207?

Spindle gear ratio parameters for rigid tapping do not match the actual mechanical gear ratio. Spindle encoder pulse count parameter incorrect for rigid tapping. Rigid tapping gear stage parameter does not match the active spindle gear. Spindle amplifier type setting conflicts with the rigid tapping parameter configuration. Parameter file restored from a different machine with different spindle specifications.

How do I fix FANUC alarm 207?

1. Check the rigid tapping related parameters (5201, 5210-5213 series) against the spindle amplifier specification. 2. Verify the spindle gear ratio parameters match the actual machine gear ratio at the commanded gear stage. 3. Confirm the spindle encoder pulse count parameter matches the installed encoder specification. 4. Compare current parameter values against the machine backup parameters for any discrepancies. 5. Contact the machine tool builder if spindle specifications are unknown.

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FANUC Controller

Program/G-code · Intermediate · 30-60 minutes

Alarm 207

Fanuc Alarm 207 - RIGID DATA MISMATCH

Alarm 207 RIGID DATA MISMATCH occurs when the CNC detects an improper relationship between programmed tapping depth and spindle/feed parameters during rigid tapping cycles (G84/G74). The system calculates expected spindle position based on Z-axis movement and feed rate, and triggers this alarm when the commanded distance is outside acceptable limits for the current spindle speed and pitch combination.

FANUCProgram/G-codeIntermediate30-60 minutes

207

Fanuc Alarm 207 - RIGID DATA MISMATCH

RIGID DATA MISMATCH

Root Cause Summary

Alarm 207 RIGID DATA MISMATCH occurs when the CNC detects an improper relationship between programmed tapping depth and spindle/feed parameters during rigid tapping cycles (G84/G74). The system calculates expected spindle position based on Z-axis movement and feed rate, and triggers this alarm when the commanded distance is outside acceptable limits for the current spindle speed and pitch combination.

Causes and Fixes

1
Navigate to SYSTEM > PARAM and check parameter 5210 (maximum rigid tapping depth). Verify programmed Z-depth in G84 block does not exceed this value. Typical range is 0-999999 (0.001mm increments).
2
Check parameter 5213 (minimum rigid tapping distance). Ensure programmed tapping depth meets or exceeds this minimum value. Default is often 0.1-1.0mm depending on machine configuration.
3
Verify G84 program syntax: G84 Z-depth R-point Q-peck F-feedrate. Confirm Z-depth is negative value and greater than R-point. Check F-code matches tap pitch multiplied by spindle speed (F = Pitch × RPM).
4
If parameters are correct, reduce programmed tapping depth incrementally by 10-20% and retest. If alarm clears, adjust parameter 5210 upward or revise program depth specification.
CAUTION: Changing parameter 5210 affects all rigid tapping operations. Coordinate with machine OEM specifications before modification.

DIY Feasiblehigh confidence

Call a technician if:

·Encoder hardware replacement needed
·Parameter limits require mechanical verification
·Spindle drive amplifier issues suspected

Prevention

Always verify thread pitch calculations before programming
Maintain clean encoder connections
Use consistent R-point heights for tapping cycles
Regular spindle reference return procedures

Common Mistakes

Confusing metric vs imperial thread pitch in feed calculations
Setting tap depth parameters too restrictively
Forgetting tool length compensation before tapping
Using incorrect G-code format for rigid tapping

Related Alarms

206 208 414 415

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