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© Copyright of Viking Drill & Tool
I Catalog I About Us I Terms I Warranty I Contact Us I Product Technical Support I Material Safety Data Sheets I I Drill Troubleshooting I Tap Troubleshooting I Feeds and Speeds I Twist Drill Terms I
| Problem |
Broken Drill |
Broken Tang |
Chips not breaking up |
Damaged Point |
Oversize hole |
Rough hole |
Poor tool life |
Web splits |
| Chipped Lips |
Broken outer corners |
| 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. Drill is dull |
| 1. Shank or socke damaged |
| 2. Drill not properly seated in socket |
| 1. Insufficient feed |
2. Improper style of drill and/ or point |
| 1. Using hard object to tap drill into socket |
| 2. Dropping, mishandling drill |
| 1. Drill point off center |
| 2. Machine spindle not rigid or not running true |
| 3. Work piece loose and/ or vibrating |
| 1. Incorrect point grind and/ or dull drill |
| 2. Excessive feed |
| 3. Incorrect or insufficient coolant |
| 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 |
| 1. Insufficient lip clearance |
| 2. Point thinned too much |
| 3. Excessive feed |
| 1. Excessive lip clearance and/ or heel relief |
| 1. Insufficient or incorrect coolant |
| 2. Excessive speed |
| 3. Scale, hard spots encountered in material |
Twist Drill Troubleshooting
| 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 |
| - Check for excessive speed, inadequate or incorrect coolant, excessive run out as drill enters work |
| - 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 |
| - Repair or replace |
| - Check for positive, secure fit |
| - Increase feed |
| - Consider use of chip-breaker design drill and/ or chip-breaker point grind |
| - Use soft lead, plastic, etc. hammer |
| - Handle with care |
| - Repoint accurately or replace with properly pointed drill |
| - Repair if possible; consider use of bushing |
| - Tighten and hold securely |
| - Repoint or replace with properly pointed drill |
| - Reduce feed |
| - Correct and adjust |
| - Correct and adjust |
| - Review and adjust |
| - Review requirements and conditions |
| - Repoint or replace with properly pointed drill |
| - Repoint or replace with properly pointed drill |
| - Reduce feed |
| - Repoint or replace with properly pointed drill |
| - Correct and adjust |
| - Reduce speed |
| - No final remedy. If this condition is prevalent; lower feeds and speeds may help |