This report describes the design and characteristics of the Salzgitter V. 100 percussive-rotary drilling machine and compares its performance with that of the Hasher DK7ES, both machines being in the condition as supplied by the manufacturers. Air consumption curves and torque/speed characteristics for the two machines are quoted, and drilling data are given for both machines operating in Pennant and Darley Dale sandstones.nIt is concluded that at a given nominal rotation speed the Salzgitter machine develops a rather higher penetration rate for a given thrust than the Hasher model. This advantage is partly due to the higher actual rotation speed achieved and may also be due to some extent to the better percussive energy transmission and the heavier percussive blow, although these latter points have yet to be definitely established.
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