Code 280-0948: Wear on dressing tool exceeds breakage tolerance
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Wear on dressing tool exceeds breakage tolerance alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
[Cause of error] Measurement of a grinding tool revealed wear on the associated dressing tool. It exceeds the tool breakage tolerance RBREAK of the dressing tool. [Error correction] - Check the grinding tool for damage - Check the associated dressing tool for damage (the dressing tool being used is defined in the tool data of the grinding wheel) - Check the tool data of the associated dressing tool - For the grinding wheel, change the correction method to "grinding wheel with correction"
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Heidenhain TNC Series CNC Alarms
Heidenhain controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 280-0948 on the TNC Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Heidenhain's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4497 Heidenhain TNC Series CNC codes.
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