61507

Access Offset Management: Navigate to HMI menu path Offset > Tool Offset Table. Verify the active D-word offset used in the current grinding block matches physical tool dimensions (diameter and length).

Check tool length compensation value against grinding tool specification sheet. Subtract actual tool length from programmed offset. Compare against machine parameter MD 20050 (tool offset memory allocation) to confirm offset is stored correctly.

Ensure grinding wheel diameter compensation is accounted for—undersized values create collision risk.

Re-touch-off the tool using the calibration probe or manual edge-finder. Update the D-word offset with verified dimensions, adding 1.5-2mm safety margin above nominal workpiece surface.

Test in DRY RUN mode (HMI > Program > Dry Run) with reduced feedrate (G0 @ 10% F) to confirm clearance before resuming production.

Locate the active grinding cycle subroutine in the NC program source code. Search for CYCLE calls or MCALL references in the failing block. Extract all Q-parameter values (Q0-Q99) that define grinding depth, workpiece offset, and clearance.

Verify cycle library path: typically stored in /Part Programs/Cycles/ on SINUMERIK storage.

Cross-reference Q-parameter values against grinding setup specification. Check machine parameters MD 37010 (grinding clearance height) and MD 37011 (grinding approach distance). Confirm MD values contain ≥1.5mm safety margin.

Audit the workpiece datum reference point. Verify TRANS or CTRANS commands in the program match the physical workpiece G54-G59 offset values stored in the offset table. Mismatch causes tool to position closer than expected.

Increase grinding approach clearance by editing Q-parameter in cycle call to +2.5mm (vs. default ±0.5mm). Test single block execution (HMI > Program > Single Block) to validate clearance before full cycle.

Retrieve current axis servo parameters: Navigate to Diagnostics > Axis Data > Active Channel. Record MD 36010 (P-gain), MD 36020 (I-gain), and MD 36030 (D-gain) for the grinding axis (typically Z-axis). Compare against Siemens recommended values for grinding in machine documentation.

Do not modify servo gains without full system validation—instability may result.

Check backlash compensation status: Verify MD 20210 (backlash compensation enable) is set to 1 for the active axis. Review MD 20211-20213 (backlash offset values in µm). If values are zero or compensation disabled, enable and re-calibrate using machine's backlash measurement cycle.

Reduce approach feedrate (G0 speed) by 50% using machine parameter MD 32100 (rapid traverse override limit). Lower feedrate reduces servo overshoot during grinding setup positioning, increasing safety margin.