| 摘要 |
<p>In a cutter of the kind described in GB-A-2078144, wherein the outer periphery of an annular cutter is accurately concentric with the central rotary axis A1 of the cutter and the inner periphery of the cutter is eccentric to a predetermined amount (e) with respect to the outer periphery of the side wall, the eccentricity (e) is such that the radial thickness of the chips (Figure 11) cut from the slug by the inner edges of the wider teeth is at least 0.025 mm. <IMAGE></p> |
