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Think
&
Tinker
Ltd.
SkypeMe at
"thinkntink"
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| Drill Troubleshooting Chart |
| Problem |
Cause |
Solution |
| Heavy Wear at Outer Edge |
|
|
| Chipping at Outer Cutting Edge |
- Loose tool, tool movement
- Workpiece movement
- Incorrect speed & feed
|
- 8, 10, 11, 12, 14, 16, 17, 21
- 8, 12, 13, 21
- 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
- Poor chip evacuation
- Workpiece movement
|
- 20 (check drill for backtaper)
- 5, 6, 8, 20
- 8, 13, 21
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| Tool Breakage |
- Loose tool, tool movement
- Workpiece movement
- Wrong drill type
- Incorrect speed & feed
|
- 8, 10, 11, 12, 14, 16, 17, 21
- 8, 12, 13, 21
- 9, 15, 16, 18, 19, 20
- 1, 2, 3, 4
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| Poor Tool Life |
- Incorrect speed & feed
- Wrong drill point
|
|
| 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
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| Chip Welding |
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| Hole Size Inaccuracy |
- Incorrect speed & feed
- Loose tool
- Wrong drill type
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| Non-Cylindrical Hole |
- Loose tool, tool movement
- Workpiece movement
- Incorrect speed & feed
- Wrong drill type
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- 8, 10, 11, 12, 14, 16, 17
- 13
- 1, 2
- 18, 21
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| Heavy Burr |
- Incorrect speed & feed
- Incorrect drill point
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| Blue Chips |
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| Long Chips |
- Poor point grind
- Incorrect speed & feed
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| Solutions Key |
1) Reduce RPM
2) Increase feed
3) Increase RPM
4) Reduce feed
5)
6)
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7) Add negative hone
8) Repoint drill
9) Correct drill type/size
10) Use self-centering drill
11) Spot/center drill
12) Clean surface
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13) Improve rigidity/clamp
14) Tighten holder
15) Use straight flute
16) Use stub length
17) Place further up holder
18) Use three-flute
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19) Use slower helix
20) Use parabolic design
21) Change point style
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