14040

Common Causes

• Circular interpolation programmed with starting and ending points that are identical or too close together, making circle center calculation ambiguous
• Machine data tolerance settings for circle radius deviation or center point deviation are too tight for the programmed geometry
• Rounding errors or insufficient decimal precision in part program coordinates causing calculated radii or centers to exceed tolerance bands
• Incorrect G-code syntax for arc commands (G02/G03) with mismatched radius values between entry and exit points

Troubleshooting Steps

1. 1Review the part program block referenced in the alarm message; verify that start point and end point of the circular interpolation are not identical and are separated by sufficient distance
2. 2Check machine data parameters governing circle interpolation tolerances (typically found in axis-specific or general interpolation settings); verify they are appropriate for your part tolerance requirements
3. 3Recalculate or regenerate the part program with higher decimal precision for arc endpoints and ensure radius values (R parameter or I/J/K values) are consistent with actual geometry
4. 4Test with a simple diagnostic G-code circle (e.g., full circle at known coordinates) to isolate whether the issue is program-specific or a systematic machine data problem
5. 5If using CAM software, regenerate toolpath and verify post-processor settings are outputting coordinates with adequate precision and correct arc format for 840D/828D controller