ROCK TOOLS
The Boart Longyear DriftMaster™ thread
geometry with carburising heat treatment is
designed to maximise resistance to wear under
the harshest drilling conditions increased while still maximising penetration rate
or tripping out rods to change bits.
Given the low hardness of the formation in this
example, Longyear Blue and Green bits are good
solutions. Tested and proven recently at a site in
Ontario, Canada, Longyear bits showed a stark
contrast, over previously preferred bits, with an
increase in penetration rate and bit life. Using a
combination of the Longyear Blue and Green bits,
driller’s averaged 109 m per bit and increased
penetration rate. When drilling softer formations
at site, the drillers used the Blue bit and found
this bit to be incomparable when looking at the
production rates and bit life. The two Longyear
formulas combined yielded a 60% improvement
in life and an 8% increase in productivity.
Using patented technology, Longyear bits have
diamonds that are chemically bonded to the
matrix creating a more versatile, faster
penetrating, and a longer-lived bit.
In production drilling, global field testing of
Boart Longyear’s new series of DriftMaster™
rods and bits “has exceeded expectations
As an example, the challenge in softer
abrasive formations, such as greenstone and
sedimentary formations, is to pick a diamond
drilling bit tough enough to get good life without
sacrificing penetration rate. With requirements to
increase productivity, a driller cannot simply pick
the toughest bit available; bit life needs to be leading to extended trial durations, extensive
sample sizes, and very positive responses.
Customers are seeing the benefits from
increased productivity and lower overall costs.”
Designed and manufactured with a unique
thread profile, DriftMaster top hammer rods and
bits boast improved strength and durability
compared to standard thread designs.
Optimising the load distribution and contact
area, the DriftMaster thread geometry with
carburising heat treatment is designed to
maximise resistance to wear under the harshest
drilling conditions. A tapered thread profile
provides superior rod-bit make-up and breakout
characteristics.
Boart says the DriftMaster offers increased
strength through stress reduction in two key
ways. First the tapered profile provides an
increased material cross-section at the base of
the threads. Second the asymmetric thread
geometry minimises stress concentrations. The
lower stress combined with deep case hardening
allows for a significant increase in cyclic load
handling capability. More load cycles means
more drilling time and more productivity.
DriftMaster rods are available in 35 mm hex
cross-sections for use with standard, Retrac, and
Straightrac button bits from 43 mm to 64 mm.
Dome and pilot reamers – including the optional,
patented, high-productivity back-reaming
RazorBack™ bit, are also available.
Power Carbide™ options from Sandvik
Sandvik has chosen to gather its most powerful
cemented carbide grades into a new group called
PowerCarbide™. “The range comes with a
combination of strength, hardness, toughness
and wear resistance. All of these properties
significantly enhance both drilling performance
Brunner & Lay
Mining
g & Construction Tools
American made and Family owned since 1882
PAVING BREAKERS
DEMOLITION TOOLS
ROCK DRILLING
American Made! Quality, Performance,
Value and Reliability, since 1882.
1510 N Old Missouri Rd, Springdale AR 72764
ph 479 756-0880 fx 479 756-5366
Call (800) 872-6899 or visit BrunnerLay.com