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Types of wear on HSS and solid carbide drills

Splintering on edges

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

Splintering on guide lands

Cause

  • Movement of the workpiece
  • Incorrect handling or transport

Solutions

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

Splintering on steps

Cause

  • Insufficient stability
  • Chuck is not strong or precise enough

Solutions

  • Check clamping device
  • Use high-precision chucks

Built-up edge

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

Chipping on guide lands

Cause

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

Solutions

  • Check workpiece clamping
  • Check coolant, increase coolant pressure

Chipping on main cutting edge

Cause

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

Solutions

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

    Cratering

    Cause

    • Cutting speed to low
    • Insufficient cooling

    Solutions

    • Increase cutting speed
    • Increase coolant pressure

    Point angle fragmentation

    Cause

    • Feed rate too low
    • Drill not running true

    Solutions

    • Increase feed rate
    • Runout < 0.02 mm

    Excessive flank wear on the cutting edge

    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

    Excessive wear on the cutting edge

    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