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Locate the alarming block number in the program and identify the G01 move with the ,R parameter.

Calculate the corner distance between the current move endpoint and the next move endpoint. The radius must be smaller than both leg distances from the theoretical sharp corner.

Reduce the ,R value to be less than the shortest available corner leg distance, typically 70-80% of the minimum corner dimension.

Re-run the program to verify the alarm is cleared and the corner executes properly.

Review the alarming block and verify the ,R parameter has a valid positive numerical value (e.g., G01 X100. Y50. ,R5.).

Check that the R value is not zero or negative, and uses the correct decimal point format for your program units (metric or inch).

Verify parameter 5108 (corner override) is set correctly for your application, typically set to 0 for standard corner rounding behavior.

Correct the R value format and magnitude, then test the program in single block mode.

Examine the two consecutive moves involved in the corner rounding operation to ensure both are G01 linear moves.

Verify the corner angle is not 0° (straight line) or 180° (reversal). Calculate the included angle between moves - it must create a distinct corner.

Check that no M-codes, G-codes (other than G01), or tool changes interrupt the corner rounding sequence between the two moves.

If the geometry is incompatible, remove the ,R parameter or reprogram the toolpath to create a valid corner with sufficient angle and distance.

Corner rounding requires two consecutive G01 blocks with a distinct corner angle