| 摘要 |
A facing cutter for making annular holes which includes a substantially cylindrical jacket having inner and outer peripheries and a lower end. A plurality of axial teeth are spaced circumferentially at the lower end of the jacket with each tooth having an inner and outer cutting edge which extends helically along the jacket. The teeth are of alternately different design, with a different angle formed by the intersection of the inner and outer cutting edges on every other tooth and the axial length of the alternate teeth being different. An initial tooth cuts the central portion of a groove to be formed to a deeper level than an alternate tooth that cuts the side portions of the groove to be formed.
|
