Rotary Drilling relies upon high rotational speeds and thrust without percussion to achievethe desired effect and outputs. In rotary drilling, the rock is made to fracture by means of a combination of “pull down” pressure on the bit and rotational power “torque”. Weight is applied to gouge, chip and grind the rock. Tricone rotary bits are sometimes a good alternative to a DTH hammer.
• Available in TCI (carbide buttons) and mill tooth configurations.
|Bit Size||7 7/8" AB40|
|API (Reg) Pin Thread||4 1/2"|
|Bit Weight (kg)||28,0|
|Bit Box (kg)||3,2|
|WOB (x1000) (lbs)||8 to 31|
|Minimum Air Pressure||60psi at Cabin & 35 to 40 psi at the bit nozzle|
|RPM||50 to 150|