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Drill Troubleshooting

America´s Finest High–Speed Cutting Tools™

Broken Tang
1. Shank or Socke damaged.
2. Twist drill not properly seated in socket.

• Repair or replace.
• Check for positive, secure fit.

Chips Not Breaking Up
1. Insufficient feed.
2. Improper style of drill and/ or point.

• Increase feed.

Damaged Point
1. Using hard object to tap drill into socket.
2. Dropping, mishandling drill bit.

• Use soft lead, plastic,etc.. hammer.
• Handle with care.

Over-sized Hole
1. Drill point off-center.
2. Machine spindle not Rigid or not running true.
3. Work piece loose and/or vibrating.

• Repoint accurately or replace with properly pointed drill.
• Repair if possible; Consider use of bushing.
• Tighten & hold securely.

Rough Hole
1. Incorrect point grind and/or dull drill.
2. Excessive feed.
3. Incorrect or insufficient coolant.

• Repoint or replace with properly pointed drill.
• Reduce feed.
• Correct and adjust.

Poor Tool Life
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.

• Correct & adjust.
• Review & adjust.
• Review requirements & conditions.

Web Splits
1. Insufficient lip clearance.
2. Point thinned too much.
3. Excessive feed.

• Repoint or replace with properly pointed drill.
• Repoint or replace with properly pointed drill.
• Reduce feed.

Chipped Lips
1. Excessive lip clearance and/or heel relief.

• Repoint or replace with properly pointed drill.

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

• Check holder and/or select another holder.
• Reduce cutting speeds or feeds.

Broken Outer Corners
1. Insufficient or incorrect coolant.
2. Excessive speed.
3. Scale, hard spots encountered in material.

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

Broken Drill Bits
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.

• 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.



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