Troublshooting For SC Drills

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