CENTERING TOOL FOR WORKING ACCURATELY COORDINATED OPENINGS

摘要

FIELD: machine engineering, tools for number program control machine tools and working centers. SUBSTANCE: tool is in the form of crosspiece free drill and it includes stem and cutting portion. In order to enhance accuracy for coordinating openings, cutting portion is in the form of double-start cone helix with apexes arranged along radius. Tool may be buildup one. It may have cutting portion in the form of two cylinder halves fastened in turning of stem, centered by means of ring and mutually joined by faces coinciding with planes passing from tool periphery to tool axis. EFFECT: improved design. 2 cl, 3 dwg