Themechanization ofhaulagedrilling inthe ...
2009-8-26u2002·u2002Drifter A light-blow, high-frequency 10 to15kWoutput machine. Theblow energy must becontrollable between 150and 200J. Blow frequency 60 to 65Hz, 3600 to 4000 blows per minute. The machine must be thrusted atbetween 6and 7kN. Drill Steel 4to5mlong, Il inch hexagonal fully carburized rod. Shank adapt-orsandcouplings should beavoided.
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