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Common Causes

• Programmed XH, YH, ZH coordinates are identical to or extremely close to the TCP position, resulting in zero or near-zero distance
• Incorrect tool orientation vector calculation where the second space curve collapses to a single point
• Tool offset or TCP definition does not match the actual tool geometry, causing coordinate convergence
• Programming error where orientation coordinates were not properly calculated before tool path execution

Troubleshooting Steps

1. 1Verify the XH, YH, ZH coordinates in the NC program block match the intended tool orientation vector and are sufficiently distant from the TCP position
2. 2Check tool offset parameters and TCP definition in the machine setup to ensure they align with actual tool geometry and program assumptions
3. 3Recalculate the second space curve coordinates to maintain adequate distance between the orientation point and TCP; modify program if distance is mathematically insufficient
4. 4Review the complete block geometry context to identify if coordinate transformations, G-code syntax, or frame definitions are causing the curve collapse
5. 5Test with a simplified orientation vector at a known safe distance to isolate whether the issue is calculation-based or setup-related