Reamer for electrical discharge machining of chipping of borehole, has cutting tip arranged parallel to face of reamer, where ratio of diameter of imaginary incircle to thickness of cutting tip is of specific range

摘要

The reamer (1) has a cutting tip (13) arranged parallel to a face (11) of the reamer and a geometrically defined minor cutting edge (27) with a major cutting edge, where the reamer is held by a tightening screw (39) on a support face (19) of a base (3). A back part of the cutting tip rests on the support face, where the back part includes a polygonal shape when seen from below. A ratio of a diameter (55) of an imaginary incircle (53) tangent to lateral edges (41, 45, 45') of the back of the cutting tip to a thickness of the cutting tip is in a range of 1.2/ 1.5.