| 摘要 |
A boring bar (12) and a boring bar holder (14). The boring bar (12) has a cylindrical body (16) having a tool end (20) with two flat surfaces (24, 26) adjacent the tool end (20) and disposed at ninety degrees to each other and at forty-five degrees to a center line of the cylindrical body (16). A journal member (28) makes line contact with the cylindrical body (16) along a line passing through the center line of the cylindrical body (16).
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