| 摘要 |
A turning tool including a generally rhombic turning tool bit having a pair of parallel main cutting faces, a pair of parallel subsidiary cutting faces arranged at an obtuse angle to the main cutting faces, parallel end faces blunting the acute angles of the rhombic tool bit and parallel upper and lower faces, and a tool holder comprising a tool holder body having formed therein an open sided tool bit receiving recess, the floor of the recess being engageable by the lower face of the tool bit, an end wall of the recess being engageable by one of the end faces of the tool bit and the side wall of the recess being engageable by one of the main cutting faces, an adjustable stop mounted adjustably on the body and having an abutment face forming a wall of the recess, engageable by one of said subsidiary cutting faces and arranged at an acute angle to the side wall, and engageable with one of said main cutting faces, and means to clamp the tool bit on the tool holder against at least the end and side walls of the recess.
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