B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
77/32
B23B 51/00 (2006.01) B23Q 11/10 (2006.01)
Patent
CA 1076849
ABSTRACT Liquid coolant and lubricant is intermittently pressure fed through a hollow drill stem to the tip of a drill, preferably a spade drill, against the workpiece by compressed air from the conventional machine shop air line which is fed over and released from a column of the liquid coolant and lubricant at selected frequencies and for selected durations without the use of motors, pumps, or other propelling devices. A pair of manually adjusted controls select the frequency of intermittent coolant feed and the length of feed duration within the selected frequency to maintain desired operating temperatures at the drill tip while effectively flushing out chips cut from the workpiece.
301353
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