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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