A path tolerance alarm during riveting machine operation is usually caused by program settings, workpiece fixturing, equipment condition, or system cache anomalies. It is recommended to follow the sequence below from simple to complex to avoid unnecessary disassembly.
I. Quick Check of Temporary Factors
Verify program parameters: Confirm that the tolerance value set in the CNC program matches the part's precision requirement and has not been accidentally altered. Also check the soft‑limit travel parameters for each axis to ensure the motion range does not exceed the set boundaries.
Inspect fixturing and workpiece clamping: Ensure the workpiece is fully seated and the locating surfaces are free from debris or burrs. Clean chips, oil, or adhesive residues from the fixture to prevent positioning offsets that lead to path deviations.
Check rivet head condition: Look for wear, chipping, or metal adhesion on the working face. If any defect is found, replace it with a standard rivet head of the same specification. For workpieces with special riveting contours, we can custom‑manufacture dedicated rivet heads according to the drawing to avoid path errors caused by mismatched standard tools.
II. Routine Maintenance Checks on the Machine Itself
Calibrate axis positioning accuracy: Use a dial gauge to measure repeat positioning accuracy for the X, Y, and Z axes. If deviations exceed the machine's specified tolerance, apply ballscrew backlash compensation through the CNC system, or check the preload of guide rail slides for looseness.
Inspect servo drive system: Observe each servo motor for abnormal temperature rise, vibration, or unusual noise; check the servo driver for error codes and ensure encoder cables are securely connected. If parameters are lost, reload the backup files.
Clean and lubricate: Remove chips and dust from guide rails and ballscrews, and replenish with suitable guideway oil (e.g., ISO VG 68). If the ballscrew or rails are severely worn, we can supply precision‑customized replacement components to restore the machine's original accuracy.
III. Alarm Reset and Log Review
Press the emergency stop switch, wait for the spindle to stop completely, then power off the control system. Restart the system to clear temporary alarm memory.
If the alarm persists after resetting, access the system alarm log to identify the specific axis that exceeded tolerance and the actual deviation value, then focus inspection on that axis's mechanical or electrical components.
Note: If the above steps do not resolve the issue, do not disassemble precision parts such as ballscrews or servo motors on your own. Record the alarm code and operation log, and contact the equipment manufacturer's after‑sales service for further diagnosis. We can also assist with on‑site troubleshooting, providing fixture calibration or parameter optimization advice to minimize downtime.
