6412

Navigate to NCK > Tool Management > Tool Table and locate the tool specified in parameter %2. Check the D-offset wear limit value and current accumulated value in the monitoring column.

Verify MD 20130 (TOOL_MONITORING_ENABLE) is set to 1 (enabled). Check MD 20131 for the prewarning threshold percentage (typically 90% by default).

Review the tool's TIME_LIMIT, PART_LIMIT, or WEAR_LIMIT parameter in the tool offset table. Reset the monitoring counter to 0 or replace/re-offset the tool if approaching service limits.

Do not ignore this prewarning; continued operation risks alarm 6413 (hard limit) causing automatic program stop.

Confirm tool change/offset reset by selecting the tool in the active T-slot and verifying the monitoring counter resets in Diagnostics > Tool Management > Active Tools.

Check SD 44600 ADDITIVE_OFFSET_ENABLE status and examine the tool's current additive offset value in Diagnostics > Offset Management > D-Offset Additive Table for the specified tool.

Review tool offset history in the offset backup file (typically in /user/offsets/) to identify cumulative drift. Compare against MD 20132 prewarning limit for additive offsets.

Additive offset values that exceed ±2.0 mm typically indicate measurement system drift or fixture wear requiring investigation.

Reset the additive offset to zero using G53.1 (or equivalent) and re-qualify the tool with a fresh offset measurement to eliminate accumulated error.

Verify the offset reset by querying the tool in Diagnostics > Offset Management and confirm the additive D-value returns to 0.000.

Perform an NCK reset (warm restart) via HMI Diagnostics > System > NCK Start/Stop to flush cached tool monitoring data and reload the tool table from persistent storage.

A warm restart will abort any running program; perform only during non-production windows.

Export the tool table using SINUMERIK Operate export function (HMI > File > Export Tool Table) and manually verify that tool %2 has valid wear limit entries and no NULL or -1 values in the monitoring fields.

Re-import or redefine the tool in the database, ensuring the D-offset entry matches the physical tool geometry and the monitoring limit is set to an appropriate value (e.g., 100 parts, 480 minutes, or 5.0 mm wear).

Clear the alarm and restart the part program to verify the prewarning does not recur on the next tool activation.