What causes Siemens SINUMERIK alarm 10755?

Starting point of approach block lies within the tool radius compensation circle, violating contour geometry. KONT (contour) approach mode selected when starting position is too close to programmed contour. Tool radius offset value larger than safe clearance distance from starting point to contour. Incorrect G41/G42 activation point in part program without adequate lead-in distance. NORM approach mode expected but KONT mode is active, causing immediate contour violation.

How do I fix Siemens SINUMERIK alarm 10755?

1. Verify the tool radius offset value in the tool table matches the actual tool diameter; correct if necessary 2. Review the approach block coordinates and ensure starting point is positioned outside the compensation circle by at least the tool radius distance 3. Switch approach mode from KONT to NORM if contour geometry does not permit tangential entry 4. Add a lead-in block (G0 or G1) that positions the tool further away from the contour before activating G41/G42 5. Simulate the NC program using the 840D/828D simulation functionality to verify tool path clearance before machine execution 6. Check the programmed contour coordinates in blocks following G41/G42 activation to confirm they account for compensation offset

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-45 minutes

Alarm 10755

Siemens 840D 10755 - Channel block selection of the tool radius compensation via

When activating the cutter radius compensation with KONT the starting point of the approach block is within the compensation circle and therefore already violates the contour. If the cutter radius compensation is selected with G41/G42, the approach behavior (NORM or KONT) determines the compensation

Siemens SINUMERIKServo/AxisIntermediate20-45 minutes

10755

Siemens 840D 10755 - Channel block selection of the tool radius compensation via

Channel block selection of the tool radius compensation via

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

Starting point of approach block lies within the tool radius compensation circle, violating contour geometry
KONT (contour) approach mode selected when starting position is too close to programmed contour
Tool radius offset value larger than safe clearance distance from starting point to contour
Incorrect G41/G42 activation point in part program without adequate lead-in distance
NORM approach mode expected but KONT mode is active, causing immediate contour violation

Troubleshooting Steps

1Verify the tool radius offset value in the tool table matches the actual tool diameter; correct if necessary
2Review the approach block coordinates and ensure starting point is positioned outside the compensation circle by at least the tool radius distance
3Switch approach mode from KONT to NORM if contour geometry does not permit tangential entry
4Add a lead-in block (G0 or G1) that positions the tool further away from the contour before activating G41/G42
5Simulate the NC program using the 840D/828D simulation functionality to verify tool path clearance before machine execution
6Check the programmed contour coordinates in blocks following G41/G42 activation to confirm they account for compensation offset

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