JCR BUTTONS BITS
As the wear of the carbide increases, the rate of penetration goes down. Bit performs best when the carbide inserts (buttons) are in their original shapes.
GENERAL CARE
Worn bits have a direct effect on drilling productivity and drilling cost. Grinding can certainly improve drilling results and reduce overall related costs by both extending bit life and providing optimum performance.
Carbide (buttons) are resistant to wear and abrasion, they do indeed develop signs of wear. The most common wear pattern is a "flat" at the impact area. This is most associated with drilling in hard and abrasive rock conditions. As this "flat" area becomes large the effective cutting action is reduced. If not corrected this situation can develop into large problems including carbide "breakage" or "shearing". Grinding at regular intervals assures of maximum bit performance.
| Component Name | Part No. |
| 60 Bit | BJCR 600 |
| 65 Bit | BJCR 650 |
| 475 Bit | BJCR 475 |
| 500 Bit | BJCR 500 |
| jet 60 Bit | BJ 600 |
| jet 65 Bit | BJ 650 |
| jet 550 Bit | BJ 550 |
| Jet 1000 Bit for 1000 Ham | BJ1000 JET1000 |
| Jet 1000 Bit for 80 Ham | BJ1000 JET80 |
| Jet 1100 Bit | BJ1100 |
| Jet 1200 Bit | BK1200 |
| Panther 350 Bit | BP350 |
| RC3 500 Bit | BRCS500 |
BIT MAINTENANCE
Carbide inserts should be ground when the buttons exhibits, flats equal to 1/3rd diameter of the insert.
| Original Carbide | DiaGrinding at Dia |
| 13 mm | 4 mm |
| 14 mm | 5 mm |
| 16 mm | 5.6 mm |
| 18 mm | 6.0 mm |