Page 56 - Diamond Products Catalog

WEDGING BITS
Boart LongyearTM wedging tools are diamond products that are made to follow wedges set in the bore hole with the intention of altering the hole direction. They consist of surface set wedge reamer, surface set bullnose bits, and impregnated tapered crown core bits. These special profiles are required to avoid drilling straight through the wedge.
Impregnated Tapered Crown Core Bits
The combination of diamond and matrix determine the performance of an impregnated bit. The simultaneous erosion of the matrix and the diamonds makes the bit self-sharpening. Boart Longyear uses a special matrix which provides optimal performance.
The tapered crown profile is available in a taper varying from 1/4” to 7/16”, chamfer (shown) and radius Stage 2.
WEDGING BIT NAMING CONVENTION
Finding the right bit is easy. The naming convention directly corresponds to the description of the bit in the list of part numbers.
HQ 09COM S C12 8@187
12345
1. Size
Bits are available in all standard sizes B, N, H, and P.
2. Matrix Formula
Impregnated bits are available in a variety of different formulas to cover the widest possible range of ground conditions. See page 26 or 34 for additional details about specific formulas.
3. Gauge
Boart Longyear bits are available in in two gauge configurations.
4. Impregnated Depth
Boart Longyear wedging bits are currently available in 2 standard impregnated depths.
5. Waterway Size
Boart Longyear wedging bits offer the widest variety of waterway sizes in the industry. The description represents the number of waterways and the waterway size.
9mm (C9)
12mm (C12)
Standard gauge (S)
Oversize (OS)
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