CPC B23D 77/00 (2013.01) [B23D 77/02 (2013.01); B23D 2277/105 (2013.01); B23D 2277/72 (2013.01)] | 2 Claims |
1. A reamer comprising: a core; and a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material, the core extending from a front end to a rear end, the core being provided with a plurality of flutes extending from the front end toward the rear end, a center-of-gravity adjustment portion being provided at least partially from terminal ends of the plurality of flutes on a rear end side toward the rear end of the core, the center-of-gravity adjustment portion causing the distance from the center of rotation to the center of gravity to be smaller than when the center-of-gravity adjustment portion is not provided, wherein the center-of-gravity adjustment portion is a lightened portion provided at a terminal end of one of the plurality of flutes, the lightened portion being a material reduction of a portion of the core.
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