Consolidated Toledo Drill - America's Finest High Speed Steel Cutting Tools
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Drill Bit – Terminology


Drills – Technical Question
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Consolidated Toledo Drill — Drill Troubleshooting

1. Broken Tang

Cause:
1. Shank or Socke damaged
2. Twist Drill not properly seated in socket

Correction:
• Repair or replace
• Check for positive, secure fit

2. Chips Not Breaking Up

Cause:
1. Insufficient feed
2. Improper style of drill and/ or point

Correction:
• Increase feed
• Consider use of chip-breaker design drill and/ or Chip-breaker point grind.

3. Damaged Point

Cause:
1. Using hard object to tap drill into socket
2. Dropping, Mishandling drill bit

Correction:
• Use Soft Lead, Plastic, etc. Hammer
• Handle with care

4. Over-sized Hole

Cause:
1. Drill point off-Center
2. Machine spindle not Rigid or not Running true
3. Work piece loose and/ or Vibrating

Correction:
• Repoint accurately or Replace with properly pointed drill
• Repair if possible; Consider use of bushing
• Tighten and Hold securely

5. Rough Hole

Cause:
1. Incorrect point grind and/or Dull drill
2. Excessive feed
3. Incorrect or Insufficient coolant

Correction:
• Repoint or replace with properly pointed drill
• Reduce feed
• Correct and Adjust

6. Poor Tool Life

Cause:
1. Coolant not reaching drill point or Insufficient or Incorrect coolant
2. Speed too high and/or Feed too low
3. Wrong type of point and/or drill for application

Correction:
• Correct and Adjust
• Review and Adjust
• Review requirements and conditions

7. Web Splits

Cause:
1. Insufficient lip clearance
2. Point thinned too much
3. Excessive feed

Correction:
• Repoint or Replace with properly pointed drill
• Repoint or Replace with properly pointed drill
• Reduce feed

8. Chipped Lips

Cause:
1. Excessive lip clearance and/ or heel relief

Correction:
• Repoint or replace with properly pointed drill

9. Cutting Edge Chipping

Cutting Edge Chipping Diagram
Cause:
1. Large run out after attached to machine, loose holder
2. Cutting speeds or feeds is too high

Correction:
• Check holder and/or select another holder
• Reduce cutting Speeds or Feeds

10. Broken Outer Corners

Cause:
1. Insufficient or incorrect coolant
2. Excessive speed
3. Scale, Hard spots encountered in material

Correction:
• Correct and Adjust
• Reduce speed
• No final remedy. If this condition is prevalent; lower feeds and speeds may help

11. Broken Drill Bits

Cause:
1. Flutes clogged with chips, drill binds in hole (Common in deep holes)
2. Drill binding due to worn outer corners
3. Work insecurely held
4. Excessive feed
5. Improper point
6. Twist drill is dull

Correction:
• Use a drill with wider flutes and/ or Faster helix angle
• Consider polished flutes
• Withdraw drill at regular intervals to clear chips
• If chips are not broken up, consider heavier feeds - or a Chip breaker design.
• Repoint or Replace drill bit
• Check for excessive speed, inadequate or Incorrect coolant, excessive run out as drill enters work material
• Use adequate holding or Clamping devices
• Reduce feed
• Check for correct lip clearance
• Use proper type of drill and point for the application
• Replace before dulling occurs. Check Feeds, Speeds and No. 5 for premature dulling