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Showing: 1 to 10 of 11600 matches for "hard rock drilling"  Page   1   2   3   4   5   6   7   8   9  next TITLE Chemomechanical Phenomena in Hard Rock Drilling  SUMMARY Page 1. Chemomechanical Phenomena in Hard Rock Drilling by A. RC Westwood, N. M. Macrnillan, and R. S. Kalyoncu The environment-sensitive ... AUTHOR Westwood, A. R. C. ; Kalyoncu, R. S. ; Macmillan, N. M. PUBLISHED 1975 TITLE Drilling – Equipment, Methods and Materials - Effect of Low Frequency Percussion in Drilling Hard Rock  SUMMARY ... 1 netted an increased penetration rate of roughly 1.7:l. Results are thus of the same order as those re- ported for hard rock drilling by other investigators." ... AUTHOR Topanelian, E., Jr. TITLE Development Of Prototype Quiet Hard Rock Stoper Drill - Volume II  SUMMARY ... tappet less drill showed 70 ft-Ibf and 2030 blows per minute at 90 psig air pressure. This was considered adequ ate for hard rock drilling. ... AUTHOR Patterson, William N. PUBLISHED 1985 TITLE Development Of Prototype Quiet Hard Rock Stoper Drill - Volume I  SUMMARY ... Figure 20 - Test Drilling of the Quiet Hard Rock Stoper at the Edgar Mine ... Quiet Hard Rok Stoper Drill Drilling With The Quiet Hard Rock Stoper Drill 9 Page 10. ... AUTHOR Dutta, Piyush K. PUBLISHED 1985 TITLE Inclined Blastholes for Pit Wall Control Using Tamrock 4000 Drill  SUMMARY ... In Scandinavian hard rock drilling the minimum economical rotary drill bit diameter is 250 mm. ... Bit life is also good in hard rock drilling. ... PUBLISHED 1989 TITLE Field Experience in Hydraulic Rock Drilling  SUMMARY ... drilling 16 metre high benches with l" rods in hard granite, 240 metres of 35 mm hole in one 7 h shift drilling 0-5 metre high benches in very hard rock with 1 ... AUTHOR Diehl GW ; Kuntonen J PUBLISHED 1978 TITLE Developments in Diamond Drilling Deflection Equipment and Techniques at Broken Hill South Ltd.  SUMMARY ... It was intended that this heavy control rod lying in the hole would maintain the bit at a fixed angle and be less inclined to lift when drilling hard rock. ... AUTHOR Jones S C PUBLISHED 1966 TITLE Tunnel Boring Under Stockholm City  SUMMARY ... as the whole operation has been stopped during probe drilling. The project is using a new generation TBM especially developed for hard rock formations which ... PUBLISHED 1987 TITLE Penetration Speed References for the Drillability of Rocks  SUMMARY ... 30 Fig. 'i.-Effect of Air Pressure Upon Drilling Speed. *Some of these curves are from JM Antill's article "Tungsten-Carbide Bits Used for Hard Rock"-Chem. ... PUBLISHED 1950 TITLE Consideration for Tubular Roof Bolt Design For a Rapid Face Bolting System  SUMMARY ... insert bits are almost mandatory for drilling rocks harder than limestone, and their use has all but made the steel bit for drilling hard rock obsolete, both ... AUTHOR Schmidt LC PUBLISHED 1991 Showing: 1 to 10 of 11600 matches for "hard rock drilling"  Page   1   2   3   4   5   6   7   8   9  next Search Again