1A0-00D2

Check transformation status

Press MOD key, check status display for active transformations. Look for 'PLANE' or 'CYC19' indicators in the coordinate system status area of the TNC display.

The status bar at bottom of screen shows transformation icons - a tilted plane symbol indicates active spatial rotation.

Cancel active transformations

Program 'PLANE RESET' or 'CYCL DEF 19.0 WORKING PLANE' with zero parameters to deactivate tilting. Alternatively, use M02 or M30 program end to reset transformations if permitted by machine parameter MP7160.

Ensure tool is at safe position before resetting transformations as coordinate system will change.

Re-establish cylinder surface cycle

After transformation reset, re-program Cycle 27 CYLINDER SURFACE with correct parameters. Verify in Test Run or graphical simulation that the cycle executes without alarm.

Use single-block mode for first execution after transformation changes to verify proper axis movements.

Review Cycle 27 programming

Open the program in Edit mode and locate CYCL DEF 27 CYLINDER SURFACE. Check parameter Q6 (CYL. AXIS) - it should specify the rotary axis letter (typically A, B, or C) that matches your machine configuration.

Q6 must reference the actual rotary axis name as defined in machine parameters, not an arbitrary designation.

Verify axis geometry relationship

Confirm machine geometry: A-axis typically parallel to X, B-axis parallel to Y, C-axis parallel to Z. Check machine documentation or MP7500 series parameters to verify your specific configuration.

On horizontal machines with C-axis table, Z-axis is parallel to spindle and C-axis - this is the required relationship for Cycle 27.

Correct cycle parameters

Modify Q6 parameter to match the correct rotary axis designation. Ensure other parameters Q1-Q5 (diameter, surface limit, etc.) are consistent with the corrected axis definition.

Test with simple circular milling pattern first to verify transformation works before complex contours.

Validate with simulation

Use Test Run mode (MOD > Test Run) to simulate the program. Observe the graphical display to confirm the cylindrical surface unwrapping displays correctly without alarm.

In simulation, you can see the unwrapped cylindrical surface representation which helps verify correct axis assignment.

Access machine parameters

Enter MOD > Machine Parameters > select MP7500 onwards. Parameter access requires appropriate user level (typically OEM password or service level access).

Changing machine parameters requires machine manufacturer authorization. Incorrect parameters can cause collision or machine damage. Document original values before any changes.

Review axis designation parameters

Check MP7500 (Axis designation for A), MP7502 (for B), MP7504 (for C). Values should be: 0=parallel to X, 1=parallel to Y, 2=parallel to Z. Verify these match physical machine configuration.

Cross-reference with machine manufacturer's parameter documentation - Heidenhain default values may differ from OEM-customized settings.

Verify kinematic model

In newer controls (TNC 640, TNC7), check Setup > Kinematic Configuration to view graphical kinematic model. Verify rotary axis vectors match actual machine build.

On iTNC 530/TNC 620 and later, kinematic editor provides visual confirmation of axis relationships - green vectors should show clear parallel relationships.