The Journal of Explosives Engineering - January/February 2015 - 19

sively, we have achieved this by incorporating standard industry shank connections into the overall design concept,"
said Mr. Eghdami.
There are clear economical advantages of eliminating the traditional plastic
components from the bit shank section.
Blow tube / foot valve breakage on DTH
bits during drilling operations are catastrophic since the hammer will cease to
function immediately. The T series hammers will alleviate such costly down time
by elimination of the plastic bit component that is susceptible to breakage.
The ROK 600T is a six inch class model with high performance drilling characteristics rated for drilling 6.1 to 7.0
inch (155 to 178 mm) diameter holes
for blast hole applications in mining and
construction.
As a T series design feature, the ROK
600T accepts the industry established bit
shank model QL60, but with the blow
tube / foot valve removed. Such standard bits are readily available from established supply channels in mining and
construction. The corresponding bit connection for this hammer is designated by
Rockmore as QL6T, which has an identical shank design to the QL60, but without the blow tube / foot valve.

New Electronic Initiation
System for Precise and Rapid
Underground Development
Salt Lake City, Utah, USA-Dyno Nobel
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blasting. The DriftShot electronic initiation system is the newest addition to the
Dyno Nobel electronic initiation system
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electronic initiation while retaining the
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DriftShot was designed specifically to
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better advance rates and improved wall
stability. DriftShot has flexible timing options that assist in providing more consistent fragmentation and reduced overbreak as part of optimizing underground
development blasting.
Pat Nill, global general manager electronics, said, "We're excited to be in-

January/February 2015

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