What causes Siemens SINUMERIK alarm 10769?

Surface normal vector and tool path tangent vector deviation exceeds allowed tolerance threshold. Incorrect CAM post-processor output generating non-perpendicular vectors for 3D tool radius compensation. Tool axis orientation vector programmed with values that conflict with calculated surface geometry. G-code generated with manually edited geometry data that violates perpendicularity constraints. Workpiece coordinate system or tool orientation parameters not properly synchronized with part program.

How do I fix Siemens SINUMERIK alarm 10769?

1. Review the part program syntax around the flagged block number and verify surface normal vector (NX, NY, NZ) and path tangent vector components are mathematically perpendicular or within system tolerance 2. Check CAM post-processor settings and regenerate the NC code from the CAM system to ensure correct vector calculation for 3D face milling operations 3. Verify tool axis orientation parameters in the machine setup and confirm they match the workpiece coordinate system defined in the part program 4. Use the Siemens diagnostic functions to inspect the actual vector values being interpreted by the control at the alarm block and compare against the source program 5. If vectors were manually edited, recalculate or re-generate them using the CAM software rather than manual adjustment to ensure mathematical accuracy

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Advanced · 30-60 minutes

Alarm 10769

Siemens 840D 10769 - Channel block Illegal surface normal vector with 3D tool radius

In 3D face milling, surface normal vector and path tangent vector must theoretically be perpendicular to one another, i.e. they must be at 90° to one another. Since both vectors can be programmed independently of each other, deviations from this angle are possible and allowed. This alarm is generate

Siemens SINUMERIKServo/AxisAdvanced30-60 minutes

10769

Siemens 840D 10769 - Channel block Illegal surface normal vector with 3D tool radius

Channel block Illegal surface normal vector with 3D tool radius

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

Surface normal vector and tool path tangent vector deviation exceeds allowed tolerance threshold
Incorrect CAM post-processor output generating non-perpendicular vectors for 3D tool radius compensation
Tool axis orientation vector programmed with values that conflict with calculated surface geometry
G-code generated with manually edited geometry data that violates perpendicularity constraints
Workpiece coordinate system or tool orientation parameters not properly synchronized with part program

Troubleshooting Steps

1Review the part program syntax around the flagged block number and verify surface normal vector (NX, NY, NZ) and path tangent vector components are mathematically perpendicular or within system tolerance
2Check CAM post-processor settings and regenerate the NC code from the CAM system to ensure correct vector calculation for 3D face milling operations
3Verify tool axis orientation parameters in the machine setup and confirm they match the workpiece coordinate system defined in the part program
4Use the Siemens diagnostic functions to inspect the actual vector values being interpreted by the control at the alarm block and compare against the source program
5If vectors were manually edited, recalculate or re-generate them using the CAM software rather than manual adjustment to ensure mathematical accuracy

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