280-0835

Check cycle definition coordinates

Review the active CYCL DEF parameters, particularly Q values for start/end positions. Verify Q1 (start) and Q2 (end) coordinates are different.

Use the cycle parameter overview in MOD function to quickly compare all Q values

Verify approach movement

Ensure there's a valid positioning move (G0 or G1) before the cycle call that establishes the tool position relative to the workpiece.

Never start a cycle without proper tool positioning

Check workpiece coordinate system

Verify the active coordinate system (G54-G59) is correctly set and the cycle coordinates reference the intended workpiece datum.

Simulate cycle execution

Use TNC simulation mode to visualize the cycle path and confirm the infeed direction is geometrically valid.

Add approach movement before cycle

Insert a G0 or G1 move to position the tool with a clear directional vector before calling the cycle. Ensure minimum 2-3mm approach distance.

Use incremental positioning (IPA/IPO) for consistent approach distances

Check Q parameter Q15 (infeed direction)

For applicable cycles, verify Q15 parameter is set correctly: +1 for positive direction, -1 for negative direction along the infeed axis.

Verify contour definition

Check that the contour subprogram or SL cycles define a closed, valid geometry with proper start and end points.

Review cycle call sequence

Ensure CYCL DEF is followed by proper CYCL CALL with valid coordinates, and no conflicting cycles are active.

Check machine parameter MP7500

Verify MP7500 (tool axis definition) is correctly set for your machine configuration. Access via MOD → Machine Parameters.

Only qualified personnel should modify machine parameters

Verify active plane selection

Confirm correct working plane is active (G17/G18/G19) and matches the intended machining operation and cycle requirements.

Check 5-axis transformation status

If using 5-axis, verify PLANE function is properly defined and tool orientation is established before cycle execution.

Reset coordinate systems

Clear any conflicting coordinate transformations and re-establish proper workpiece coordinate system with preset or manual datum setting.

Delete and recreate cycle definition

Remove the problematic CYCL DEF line and reprogram it completely, ensuring all required Q parameters are defined with valid values.

Check cycle parameter completeness

Verify all mandatory Q parameters for the specific cycle are present and within valid ranges according to TNC programming manual.

Validate numeric values

Ensure all Q parameter values are realistic (no zero divisions, negative values where positive required, etc.).

Test with simplified cycle

Create a basic version of the cycle with minimal parameters to isolate the problematic parameter or geometric condition.