CNC Machining Common Issues and Improvement Methods(二) Seven, Edge Chipping. Causes and Improvements: Feeding too fast Slow down to an appropriate feed rate. Rapid feed at the beginning of cutting Slow down the feed speed at the beginning of cutting. Loose clamping (tool) Tighten the clamp. Loose clamping (workpiece) Tighten the clamp. Insufficient rigidity (tool)