| 摘要 |
A lathe tool in which the bit is of a shape providing easy manufacture and regrinding, and a long life. The outline of the lateral faces of the bit is an elongate isosceles trapezium and an elongate isosceles triangle having as its base the longer of the two parallel sides of the trapezium, the end faces of the bit forming the equal sides of the trapezium, two inclined upper faces of the bit forming the two equal sides of the triangle and a cutting edge being formed at the junction of each upper face and the adjacent end face. |
