| 摘要 |
A holder ( 20 ) for a cutting insert ( 12 ), which includes a head ( 22 ) with a pocket ( 24 ) for holding the cutting insert and a bar device ( 26 ) for supporting the head, allows the use of a removable head for a miniature head and bar device that fits into a small hole in a workpiece, and allows rapid and easy replacement of the head. The head has a front part ( 42 ) of small height for holding the cutting insert and has a taller rear part ( 40 ) of the same height as the bar device. The head rear part has a screw-receiving hole ( 56 ) that extends at a downward-rearward incline (A) into a corresponding threaded hole ( 62 ) at the front of the bar device. The head and bar device respectively have a recess ( 70 ) and a projection ( 74 ) that lie around the screw-receiving holes and that align the head and bar device. A coolant passageway system ( 92 ) in the bar device provides coolant for both right and left hand heads.
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