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美国Derbyshire公司制造了一种用于钻削0.003吋～5/16吋(0.0762～7.93毫米)車床用小孔钻削装置。其找正和控制的特点是:当工件和钻头同时轉动时,钻削得既
Derbyshire, USA, manufactures a hole driller for drilling lathes from 0.003 “to 5/16” (0.0762 to 7.93 mm). Its alignment and control features are: when the workpiece and the drill while turning, drilling both