SurfaceSet Diamond Coring Bits Surface set bits can be very cost effective in soft sedimentary rocks. Boart Longyear™ offers a wide variety of designs for traditional surface set diamond bits and offers the new diamond impregnated SurfaceSet XP™ bit.
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New SurfaceSet XP™
Boart Longyear's new SurfaceSet XP bit, utilizes impregnated diamond technology to offer a more versatile and longer-lasting alternative to traditional surface set bits. Field tested for over a year, the new Surface Set XP bits achieved a minimum of 200% increase in life over traditional surface-set bits.
Download Surface Set XP Tech Overview Brochure
Traditional Surface Set Bit Options:
Surface set size:
Boart Longyear bits are available in all standard drilling sizes as well as a number of region-specific sizes.
| Core Diameter Offering | | Size | Core | Hole | | AQTK | 35.5 mm (1-3/8 in) | 48 mm (1-7/8 in) | | BQ | 36.4 mm (1 -7/16 in) | 60 mm 2-3/8 in) | | BQTK | 40.7 mm (1-5/8) | 60 mm (2-3/8 in) | | NQ | 47.6 mm (1-7/8 in)
| 75.7 mm (3 in) | | NQTK (NQ2") | 50.6 mm (2 in) | 75.7 mm (3in) | | NQ3 | 45 mm (1-3/8 in) | 75.7 mm (3 in) | | HQ | 63.5 mm (2-1/2 in) | 96 mm (3-3/8 in) | | HQ3 | 61.1 mm (2-3/8 in) | 96 mm (3-3/8 in) | | PQ | 85 mm (3-3/8 in) | 122.6 mm (4-7/8 in) | | PQ3 | 83 mm (3-1/4 in) | 122.6 mm (4-7/8 in) |
Gauge:
Boart Longyear bits are available in three standard gauge configurations:
Standard gauge (S)
Equal to reaming shell gauge (R)
Oversized OD (OS, INCHES)
Waterways:
Where applicable, waterway options will be identified as follows:
Spiral (SW)
Double angle (DA)
Face discharge (FD)Diamond Configuration:
Once a crown profile has been identified, diamond grade and diamond size are the key factors to choose from to maximize your drill bit’s performance for life and speed. Standard Diamond Sizes
(In Stones per Carat - SPC) | | SPC Range | Diamond Size | | 6/10 | 0.098 in | 2.49 mm | | 10/15 | 0.085 in | 2.16 mm | | 15/25 | 0.071 in | 1.80 mm | | 25/35 | 0.063 in | 1.560 mm | | 35/45 | 0.058 in | 1.47 mm | | 45/55 | 0.054 in | 1.37 mm | | 55/70 | 0.048 in | 1.22 mm | | 70/90 | 0.044 in | 1.12 mm | | 90/100 | 0.042 in | 1.07 mm | | 110/130 | 0.040 | 1.02 mm |
Diamond Grade:
In selecting the correct diamond grade for the ground condition you are in, the following selection guidelines should be considered:
Premium (PRM): Has the highest percentage of high quality unprocessed natural diamonds.
Special (SPL): H as a lower percentage of high quality unprocessed natural diamond compared to our premium grade.
Select (SEL): The best quality, processed drilling diamonds are suitable for core bits for medium hard to softer formations. These are lower cost diamonds suitable for all general purpose tools.
Standard (STD): The lowest cost, partially processed drilling diamonds are normally used in casing tools, and are suitable in core bits for soft formations.
Diamond size:
The harder the rock, the smaller the diamonds should be. However, small diamonds should not be specified for drilling in broken ground.
The number of individual diamonds is a very important factor in determining how well a bit will cut. Boart Longyear uses a mathematical formula to position each and every diamond on a bit to ensure proper overlap with a minimum number of diamonds. This keeps the carat weight and initial bit cost as low as possible in a balanced design.
Using advanced powder metallurgy technology, coupled with decades of field experience, Boart Longyear has developed a high performance matrix that is suitable for virtually all drill conditions.
Surface Set Crown Profiles:
The profile of the bit face or crown is important because it affects drilling speed, hole deviation, and core recovery. There is a wide choice of profiles for surface set bits which cover all common drilling conditions. As a rule, multistep bits drill fastest but are less robust in hard, broken conditions where round or semi-flat profiles are preferred.
Semi-round (SRC)
The semi-round is a good general purpose bit, suitable for a wide variety of conditions, providing good strength in broken conditions.
Step-type (STP)
The step-type profile provides stabilized drilling capabilities and improves penetration in hard and competent formations. Available in 1-4 step profiles.
Pilot (PC)
The pilot is good for core recovery in soft consolidated formations, offering improved stability and reduced vibrations.
Pilot with face discharge (PC)
The face discharge crown increases core recovery in delicate formations, and features extended ports to minimize sample erosion.
Pilot Plug (PC)
The pilot plug bit has two rounded shoulders to a concave face, and is used to control hole deviation in softer formations.
Concave face plug (CC)
The concave face plug bit features a rounded shoulder to a concave face, and is used in general purpose drilling.
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