Boart Longyear has upgraded its Stage diamond coring bits.
The new bits include upgrades to the Stage3 waterways, Stage bits with a 16 millimetre crown and an optional face-discharge feature.
With crown heights of more than 25 millimetres, the new bits provide better penetration rates, longer active drilling in the hole and fewer rod trip outs.
The design features an expansion of the window which improves productivity, revised window layout and Boart’s Razorcut face design which the company claims provides the driller with a ready to cut bit straight from the box.
These window upgrades includes window with rounded corners for greater durability and increased resistance to damage caused by debris in fractured ground conditions.
The Stage windows are now positioned to rotate in the opposite direction of the rod’s rotation, creating more surface material which increased the strength of the crown.
The windows also feature an inward twin taper design to increase wear resistance and creates more material on the window’s inner diameter which increases material strength.
In addition, the tapered windows cause high fluid velocity in the inner diameter, resulting in better flushing of fluids, cuttings and debris.
The 16 millimetre model also includes the upgraded technology for more options when drilling at shallower target depths.