B961: Hollow Drill Breakage –
Causes & Corrections
| Indication | Cause | Correction |
|---|---|---|
| Cutting edge of drill bell forming and heat coloring. | DULL DRILL – Heating drill bit to point of removing temper. | SHARPEN DRILL – Reduce RPM or turning speed of drill. Increase strokes/minute to reduce time of drill in paper. |
| Cutting edge of drill bell forming. No heat coloring. Spiral split in drill. | DULL DRILL – Forcing drill through lift too fast. | SHARPEN DRILL – Reduce strokes/minute. Increase RPM or turning speed of drill. |
| Drill breaking at shank. No bell forming, no heat coloring. Chips free in drill. | Drill being deflected. Breakage due to fatigue. | Check head mounting square on rail. Make drill pattern in wood stick – no paper. Make drill pattern in wood stick with paper. Note deflection on wood stick. |
| Chips tight in hollow drill. | DULL DRILL – Crowding drill, punching rather than cutting. | SHARPEN DRILL – Reduce strokes/minute. Increase RPM or turning speed of drill. Check for heat coloring of drill when increasing RPM. |
| Chips tight in hollow drill. | Drilling paper with adhesive or thermal binding material. | When drilling cycle stops, drill a couple of holes in bond paper to clear chips out of drills. Do not allow adhesive to harden. |
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Lithco Products
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