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.


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


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