Types of wear on HSS and solid carbide drills

Cause

• Workpiece moves when the drill enters the material (e.g. workpiece is not clamped properly) 
• Insufficient cooling
• Runout error too large

Solutions

• Check clamping element (check for play in the spindle unit) 
• Check coolant supply 
• Optimise runout

Cause 

• Movement of the workpiece
• Incorrect handling or transport

Solutions

• Check workpiece clamping and tool stability
• Use original packaging for storage and transport

Cause

• Insufficient stability
• Chuck is not strong or precise enough

Solutions

• Check clamping device 
• Use high-precision chucks

Cause

• Cutting speed too low
• Negative bevel on cutting edges 
• Insufficient cooling

Solutions

• Increase cutting speed 
• Use a drill with sharper cutting edge preparation 
• Check coolant supply

Cause

• Workpiece is moving when the drill exits the material; "springback" 
• Insufficient cooling

Solutions

• Check workpiece clamping
• Check coolant, increase coolant pressure

Cause

• Unstable drilling conditions
• Interrupted cut 
• Maximum wear width exceeded

Solutions

• Optimise workpiece and tool clamping 
• Reduce feed rate 
• Change tool earlier

Cause

• Cutting speed to low
• Insufficient cooling

Solutions

• Increase cutting speed 
• Increase coolant pressure

Cause

• Feed rate too low 
• Drill not running true

Solutions

• Increase feed rate 
• Runout < 0.02 mm

Cause

• Cutting speed too high 
• Feed rate too low 
• Insufficient cooling 
• Drilling from two sides or interrupted cut on exit from material

Solutions

• Reduce cutting speed
• Increase feed rate 
• Use higher-quality coolant (higher concentration, increase pressure, nozzle placement?)
• Check drill exit from material

Cause

• Cutting speed too high
• Coolant pressure too low 
• Drill not running true

Solutions

• Reduce cutting speed, increase feed rate 
• Increase coolant pressure 
• Runout < 0.02 mm