A range of surface set core bits are manufactured to the highest quality standards to give long service life and maximum penetration in soft to hard formations. The range includes a variety of diamond grades, stone sizes and face profiles enabling a cost effective solution to be taken for most conditions.
Diamond Grades
Drill 1 : Very good quality, processed, well rounded diamonds, free from flaws for medium to very hard fromations.
Drill 2 : Good quality, processed, rounded diamonds, free from flaws for soft to medium formations.
Carbonado : Microcrystalline natural diamonds with a very tough structure, used in severe drilling conditions where conventional natural stones tend to fracture, such as badly fractured formations.
Diamond Stone Size: Stones Per Carat (spc)
10/15 spc: Soft to Medium Formation
20/25 spc: Medium to Hard Formation
30/40 spc: Medium Hard to Hard Formation
40/60 spc: Hard Formation
60/80 spc: Hard to Very Hard Formation
Face Profiles
Semi Round : Standard profile. Very strong in hard broken formation.
Stepped : High penetration and stability but fragile in hard fractured formation.
Conical : Good penetration rate and stability. Stronger than stepped profile.
Pilot : Good core recovery in soft, friable formation especially when used with face discharge. Good stablisation but fragile nose.
Biconical : Only used on thick kerf core bits in soft unfractured formation.
See also:
Tungsten Carbide Core Bits
Geotechnical & PDC Diamond Core Bits
Impregnated Diamond Core Bits
