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JCR Bits

Technical Description

Component Name Part No.
60 Bit
65 Bit
475 Bit
500 Bit
jet 60 Bit
jet 65 Bit
Jet 550 bit
Jet 1000 Bit for 1000 Ham
Jet 1000 Bit for 80 Ham
Jet 1100 Bit
Jet 1200 Bit
Panther 350 Bit
RC3 500 Bit
BJCR 600
BJCR 650
BJCR 475
BJCR 500
BJ 600
BJ 650
BJ 550
BJ1000 JET1000
BJ1000 JET80
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
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.

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