CNC router Troubleshooting

Symptoms: Cut paths wander mid-part, small parts launch at the final pass, scrapped sheets. Likely causes: Spoilboard sealed or worn; Low vacuum; Small parts with too little hold area; Porous material bleeding vacuum. Fixes: Resurface the spoilboard and keep it flat; a glazed board blocks airflow to the part. Check pump performance, filters and gasket leaks; verify zoning matches the nest. Use onion skinning, tabs or pods for small parts instead of trusting raw vacuum. Use gasketing or sacrificial films under porous sheets. Prevention: Spoilboard resurfacing cadence, vacuum-level checks in setup, nest rules for minimum part area.

Symptoms: Fuzzy laminate edges, burn marks on hardwood, melted edges on plastics. Likely causes: Dull or wrong tooling; Chipload wrong; Wrong cut direction; Resin build-up on the tool. Fixes: Replace tools on cadence and pick geometry for the material (compression for laminates, O-flute for plastics). Set feed and speed for the recommended chipload; rubbing burns, over-feeding tears. Use climb vs conventional appropriately per material and pass. Clean pitch and resin off tools; build-up cooks the edge even with sharp carbide. Prevention: Tool-life tracking by metres cut, feed and speed recipes per material, tool cleaning routine.

Symptoms: Spindle hot to touch, thermal alarms late in shift, noise or runout rising over weeks. Likely causes: Cooling system faults; Unbalanced tooling; Contaminated collet or taper; Aggressive cycles beyond duty. Fixes: Service spindle fans or chiller loops; verify coolant flow and temperature to liquid-cooled spindles. Balance holders and tools for the operating RPM; imbalance hammers bearings continuously. Clean collets and tapers every tool change; chips in the taper cause runout and heat. Match cut parameters to the spindle duty rating; sustained overload cooks grease and bearings. Prevention: Spindle temperature trending, tool balancing discipline, collet-cleaning routine, duty-cycle review for new programs.