10961

Common Causes

• G-code program contains 4th or 5th degree polynomial spline commands (POLY, ASPLINE, or BSPLINE) on geometry axes while radius compensation is active
• Incorrect tool radius compensation mode (G41/G42) enabled during execution of high-degree polynomial blocks
• CAM post-processor generated spline geometry with degree higher than 3 while compensation was not suppressed
• Program attempts to use NURBS or extended spline syntax incompatible with active radius compensation
• Multiple geometry axes programmed with polynomial degrees exceeding cubic while compensation offset is in effect

Troubleshooting Steps

1. 1Review the G-code at block %2 in channel %1; identify the polynomial spline command and verify its degree (cubic maximum = degree 3)
2. 2Confirm radius compensation mode (G41/G42) is active; if polynomial geometry is required, deactivate compensation with G40 before the block and reactivate after if needed
3. 3Check CAM post-processor settings to ensure spline fitting is limited to cubic polynomials (degree 3) when radius compensation is enabled in the part program
4. 4Modify the program to decompose 4th/5th degree polynomials into multiple cubic segments, or restructure the tool path to avoid compensation during high-degree spline blocks
5. 5Verify syntax of spline commands matches the 840D/828D controller specification; confirm POLY/ASPLINE/BSPLINE parameters are correct for the active control mode