Serious diameter wearing causes a number of problems like small hole diameter, roughness of hole
wall, resin smear and
nail head. In the case of extreme wearing, a drill bit will form a front taper shape and lose the
clearance part of its
geometry.
*Photo of a drill bit which has the lost clearance part through extreme wear.
Extreme wear
| Cause | Failure condition | Countermeasure |
|---|---|---|
| Small margin width | Promotes diameter wearing | Enlarging margin width. Set suitable margin length. |
| Unsuitable tungsten carbide material | Excessive wearing reduces drill diameter | Use wear-resistant WC material. |
| Cause | Failure condition | Countermeasure |
|---|---|---|
| Corrosion of tungsten carbide material | If used drills are soaked excessively in acid or water, its causes a CO deficit, which weakens the characteristic of the Tungsten Carbide and can cause premature wearing | Avoid keeping drill bits in high humidity places and soaking in acid/water for a long time. Dry cleaning is recommended process for cleaning. |
| Cause | Failure condition | Countermeasure |
|---|---|---|
| To many hit counts | To many hits promotes wearing | Set suitable hit counts. |
| Low chipload | Wearing increases because of long contact time of drill bit with PCB. | Apply suitable chipload. (Please refer to drilling parameters.) |
| High spindle speed | Wearing increases because of long contact time of drill bit with PCB. | Apply suitable spindle speed. (Please refer to drilling parameters.) |
| Excessive number of repoints | Accumulation of diameter wearing causes large wearing. | Reconsidering the number of repoint times. |
| Cause | Failure condition | Countermeasure |
|---|---|---|
| Hinge number and thickness of PCB copper layers | Increased tool load, promotes wearing | Decrease PCB stack heights and hit count to reduce drill bit damage. |
| Hard cutting PCB material | Increasing tool load, resulting in wearing and breakage. |
PRODUCT 01 PCB Drills / Routers / Ultra precision micro-hole drill
