DRILLING MACHINE WITH STEPFEED FUNCTION

摘要

The drilling machine has a feed device for reciprocating a quill, a driving member and a driven member, disposed between a spindle rotatably supported by the quill and a driving source. Angular displacement is effected according to magnitude of a load applied on a tool held by the spindle. A detector generates a series of pulse signals correlated to the relative angular displacement between both members. The pulse signals are generated from the detector in respect of one rotation of the spindle. A memory stores numerical data, corresp. to the relative angular displacement while the tool being separated from a workpiece, counted by the counter.