Results 121 to 130 of about 213 (157)

Effectual design of hammers for rotary-percussive drilling machines

Journal of Mining Science, 2011
Based on the review over theoretical and experimental analyses of influence the drilling machine hammer design exerts on the rock fracture process efficiency, the author draws a conclusion that hammers with curvilinear side surfaces are not an optimal choice as they do not provide a noticeable increase in the impact energy utilization while greatly ...
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Results from Testing of Two Rotary Percussive Drilling Systems

Earth and Space 2010, 2010
The developmental test program for the MSL (Mars Science Laboratory) rotary percussive drill examined the e ect of various drill input parameters on the drill pene- tration rate. Some of the input parameters tested were drill angle with respect to gravity and percussive impact energy. The suite of rocks tested ranged from a high strength basalt to soft
Kristopher Kriechbaum, Kyle Brown, Ian Cady, Max von der Heydt, Kerry Klein, Eric Kulczycki, Avi Okon   +6 more
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Prototype rotary percussive drill for the Mars Sample Return mission

2011 Aerospace Conference, 2011
Since 1990s Honeybee Robotics has been developing and testing surface coring drills for future planetary missions. Recently, we focused on developing a rotary-percussive core drill for the 2018 Mars Sample Return mission and in particular for the Mars Astrobiology Explorer-Cacher, MAX-C mission.
Kris Zacny, Jack Wilson, Phil Chu, Jack Craft   +3 more
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The wear of WC-Co drill bits during rotary-percussive drilling of reinforced concrete

International Journal of Refractory Metals and Hard Materials, 2017
Abstract The wear mechanisms of WC-Co hardmetal drill bits during rotary-percussive drilling of reinforced concrete depend a number of factors such as the loading spectrum (thermo-mechanical stresses); workpiece material (type of concrete and reinforcement steel); hardmetal grade (WC-grainsize and Co-content); and drill bit geometry (design and ...
Siavash Momeni, Steven Moseley, Michael Ante, Jan Allaart   +3 more
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Reduction of power-intensivity at rotary-percussive drilling

Geo-Technical mechanics, 2020
O.Ye. Nazarov, V.F. Gankevych, O.A. Pashchenko, V.Ya. Kiba   +3 more
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Rotary-Percussive Deep Drill for Planetary Applications

Earth and Space 2010, 2010
Gale Paulsen, Kris Zacny, Chris McKay, Lori Shiraishi, Kristopher Kriechbaum, Brian Glass, Mateusz Szczesiak, Chris Santoro, Jack Craft, Ramesh B. Malla, Mike Maksymuk   +10 more
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Ways to improve rotary-percussive drilling efficiency

Gornyi Zhurnal, 2018
A. S. Kondratenko, V. V. Timonin, V. N. Karpov, A. I. Popelyukh   +3 more
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Experimental and numerical investigations on rock-breaking mechanism of rotary percussion drilling with a single PDC cutter

Journal of Petroleum Science and Engineering, 2022
Yan Xi, Lifeng Fan, Chunqing Zha
exaly  

Completely hydraulic rotary percussive rock drills

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1974
F.B. Leventus, G. Cagnioncle
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Simulation Analysis of Drilling Process in Horizontal Wells with Mechanical Rotary Percussion Tool

Chemistry and Technology of Fuels and Oils, 2022
Zhichuan Guan, Guan Zhichuan
exaly