Problem Cause Solution

Chatter
  • High Cutting Speed
  • Feed rate too low
  • Workpiece movement
  • Toolholder rigidity
  • Tool rigidity
  • Lower RPM or increase feed rate
  • Increase feed rate
  • Tighten workpiece rigidity
  • Tighten toolholder or reduce float
  • Use shorter tool,place further up holder

Tool Wear/Chipping
  • Incorrect feed rate
  • Incorrect speed
  • Poor hole condition
  • Abrasive Material
  • Poor Chip evacuation
  • Poor Coolant
  • Insufficient Coolant
  • Workpiece alignment
  • Excessive Stock removal
  • Increase feed rate (typically)
  • Reduce speed (typically)
  • Work-hardened hole;Change drilling type
  • Use proper coolant,coated reamer
  • Use/increase coolant, use helical reamer
  • Replace coolant or correct mixture
  • Increase coolant volume
  • use bushing,floating holder,lead chamfer
  • Use large diameter starter drill

Tool Breakage
  • Incorrect feed rate
  • incorrect speed
  • Tool Wear
  • Bottoming of hole
  • Coolant conditions
  • Increase feed rate (typically)
  • Reduce speed (typically)
  • Sharpen or replace reamer
  • Adjust stop depth,check preset
  • Increase replace or correct coolant

Poor Finish
  • Feed rate too Low
  • Insufficient stock removal
  • Poor hole condition
  • Poor coolant
  • Insufficient coolant
  • Increase feed rate
  • Use smaller diameter starter drill
  • work-hardened hole;change drill type
  • replace/correct,coolant mixture
  • Increase coolant volume

Hole Tolerance
  • workpiece alignment
  • Incorrect tool size
  • Material shinkage
  • Tool wear
  • Toolholder runout
  • Use bushing,floating toolholder
  • Check diameter of tool
  • Adjust diameter for shrinkage;more coolant
  • sharpen or replace tool
  • Adjust or replace toolholder