Rock Roller Bit Bearing structure
Journal/Friction BRG.
The journal bearing system, specifically developed for Drilcos’s DF and TF series, offers the longest life of any bearing currently available.
DF series bits are ideally suited for applications requiring high rotary speed, having high bottom hole temperatures and drilling in excessively abrasive conditions. Drilcos’s specially formulated grease, for all its bearing, contains two solid lubricants; graphite and molybdenum disulfide. This graphite base grease, minimize any seal damage and reduces friction.
Open Roller BRG.
Drilcos recommends the DO series for tungsten carbine bits and TO series for milled tooth bits. The oldest bearing design presently in use is the roller – ball – friction bearing, normally referred to as the roller bearing. A specially formulated lithium base grease, developed by Drilcos for it’s all-open roller bearing, helps extend bearing life.
Sealed Roller BRG.
This type of bit is used in high RPM and directional work. The TS/DS line, features an O-ring sealed ball and roller bearing with Drilcos’s innovative tungsten carbide insert or steel tooth cutting structure.
“G-Grade” tungsten carbide inserts are added to the gauge area of the cone to help maintain gage in deviated holes.
Air Blast
When drilling conditions and formations allow air to be used instead of mud as the circulating medium, Drilcos recommends the DA series for tungsten carbide bits and TA series for milled tooth bits(for air drilling only). Drilcos has designed these bits with increased number of heel and gage to maximize resistance to gage wear.
Jet System
3 Jet & 1 Center Jet Circulation
Centeral Circulation
Three Jet Circulation
Insert Bits
Drilcos insert bits are designed to provide fast rate of penetration, high durability represents a unique effort to provide the right selection of insert size, spacing, shape, protrusion, material selection and hardness for different formations. Drilcos’s computer designed insert bits give optimum results on the field by eliminating tracking and off-center rotation. Long, protruding conical shaped inserts are used in bits for soft formations and soft-to-medium-hard formations. Chisel-shaped inserts are mainly used in soft and medium-hard formations. Spherical type inserts are used in hard and very hard formation bits.