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Review the part program line that triggered the alarm and identify which axis is specified in the G84/G74 cycle (typically should be Z-axis on vertical mills, W or Y on horizontals).

Check parameter 5200 (rigid tap axis designation) to verify which axis is configured for rigid tapping - ensure it matches your program command.

Verify parameter 1410 bit 4 (rigid tapping enable) is set to 1 for the affected axis.

Correct the program to use the properly configured tapping axis, or modify parameters with proper authorization to enable the desired axis for rigid tapping.

Parameter changes require machine builder documentation and may affect machine operation - document original values before changes.

Verify spindle encoder is functioning by checking diagnostic screen for spindle position feedback (DGN 440 or spindle load meter shows active feedback during rotation).

Check parameter 4000-4004 (spindle position coder settings) to ensure correct encoder type and gear ratios are programmed for spindle/axis synchronization.

Verify parameter 5200 series (rigid tapping parameters) including tap mode setting bit and maximum RPM limits are correctly configured.

Test spindle synchronization in MDI with a simple G84 cycle at low RPM in safe tool-free position to verify system response before running production.

Ensure spindle is in low gear and area is clear before testing synchronization.

Review the modal G-code state before the G84/G74 command - check for active G68 (rotation), G51 (scaling), or G52 (local coordinate system) which may prevent rigid tap execution.

Ensure G98 or G99 (return point specification) is programmed with the tapping cycle, and verify G90 (absolute) mode is active rather than G91 (incremental) if required by your control version.

Check that no tool radius compensation (G41/G42) or tool length compensation conflicts exist - cancel with G40 and reestablish if necessary.

Add explicit modal cancellation commands (G40 G49 G69 G50) before the rigid tapping cycle and re-test the program from the beginning of the tapping routine.