What causes Siemens SINUMERIK alarm 10756?

Tool radius compensation (G40) deselection programmed at a point inside the tool radius circle, causing potential contour violation. Insufficient clearance between the programmed endpoint and the part contour when compensation is disabled. Incorrect tool radius offset value causing the compensation circle to extend into the workpiece boundary. G40 command executed without proper positioning or intermediate moves to clear the compensation zone. Mismatch between actual tool diameter and programmed tool offset in the tool table.

How do I fix Siemens SINUMERIK alarm 10756?

1. Review the NC program block where G40 is called and verify the tool is positioned outside the compensation circle before deselection 2. Check the tool radius offset table and confirm the tool diameter values match the actual cutting tool being used 3. Verify the part geometry and ensure the programmed endpoint during G40 execution provides adequate clearance from the contour 4. Add an intermediate positioning move (G01 or G00) after tool radius compensation is active to move the tool away from the part contour before executing G40 5. Confirm the approach behavior settings (NORM or alternative) in the machine parameters and adjust the NC program deselection strategy accordingly

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-45 minutes

Alarm 10756

Siemens 840D 10756 - Channel block deselection of the tool radius compensation via

On deselection of the cutter radius compensation, the programmed end point is within the compensation circle. If this point were in fact to be approached without compensation, there would be a contour violation. If the cutter radius compensation is deselected via G40, the approach behavior (NORM or

Siemens SINUMERIKServo/AxisIntermediate30-45 minutes

10756

Siemens 840D 10756 - Channel block deselection of the tool radius compensation via

Channel block deselection of the tool radius compensation via

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Common Causes

Tool radius compensation (G40) deselection programmed at a point inside the tool radius circle, causing potential contour violation
Insufficient clearance between the programmed endpoint and the part contour when compensation is disabled
Incorrect tool radius offset value causing the compensation circle to extend into the workpiece boundary
G40 command executed without proper positioning or intermediate moves to clear the compensation zone
Mismatch between actual tool diameter and programmed tool offset in the tool table

Troubleshooting Steps

1Review the NC program block where G40 is called and verify the tool is positioned outside the compensation circle before deselection
2Check the tool radius offset table and confirm the tool diameter values match the actual cutting tool being used
3Verify the part geometry and ensure the programmed endpoint during G40 execution provides adequate clearance from the contour
4Add an intermediate positioning move (G01 or G00) after tool radius compensation is active to move the tool away from the part contour before executing G40
5Confirm the approach behavior settings (NORM or alternative) in the machine parameters and adjust the NC program deselection strategy accordingly

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