ProblemCauseSolution

Heavy Wear at Outer Edge

  • Insufficient Coolant
  • Incorrect Speed & Feed
  • 5,6
  • 1,2,8

Chipping at Outer Cutting Edge

  • Loose tool,tool movement
  • workpiece movement
  • Poor coolant conditions
  • Incorrect speed & feed
  • 8.10,11,12,14,18,17,21
  • 8,12,13,21
  • 5,6
  • 1,2,3,4

Drill Point Chipping

  • Loose tool,tool movement
  • Incorrect speed & feed
  • Drill Centering
  • 10,11,12,14
  • 1,2,3,4
  • 8,10,11,12,21

Margin Wear

  • Drill margin rubbing wall
  • Porr chip evacuation
  • poor coolant conditions
  • workpiece movement

 

  • 5,6,8,20
  • 5,6
  • 8,13,21

Tool Breakage

  • Loose tool,tool movement
  • workpiece movement
  • Wrong drill type
  • poor coolant conditions
  • Incorrect speed & feed
  • 8.10,11,12,14,18,17,21
  • 8,12,13,21
  • 9,15,16,18,19,20
  • 5,6
  • 1,2,3,4

Poor Tool life

  • Incorrect speed & feed
  • poor coolant conditions
  • Wrong drill Point
  • 1,2,3,4
  • 5,6
  • 8,21

Drill Walk

  • Incorrect speed & feed
  • Tool Wear
  • Wrong drill Point
  • Material Condition
  • 1,2
  • 7,8,21
  • 8,10,11,21
  • 11,12,15,16,17

Chip Welding

  • Poor coolant conditions
  • Wrong drill type
  • 5,6
  • 19,20

Hole Size Inaccuracy

  • Incorrect speed & feed
  • Poor coolant conditions
  • Loose tool
  • Wrong drill type
  • 1,2,3,4
  • 5,6
  • 14
  • 9,18

Non- Cylinderical Hole

  • Loose tool,tool movement
  • Workpiece movement
  • Incorrect speed & feed
  • Wrong drill type
  • 8,10,11,12,14,16,17
  • 13
  • 1,2
  • 18,21

Heavy Burr

  • Poor coolant conditions
  • Incorrect drill point
  • 1,2
  • 8,21

Blue Chips

  • Poor coolant conditions
  • Tool wear
  • 5,6
  • 7,8

Long Chips

  • Poor point grind
  • Incorrect speed & feed

 

  • 8
  • 1,2

Solutions Key

  • Reduce RPM
  • Increase feed
  • Increase RPM
  • Reduce feed
  • Increase coolant
  • Increase mixture
  • Add negative hone
  • Repoint drill
  • Correct drill type/size
  • use self-centering drill
  • Spot/center drill
  • Clean surface
  • Improve rigidity/clamp
  • Tighten Holder
  • Use straight Flute
  • Use stub length
  • Place further up holder
  • Use three-flute
  • Use slower helix
  • Use Parabolic Design
  • Change Point Style