| 摘要 |
Cutters of the type referred to have cutting teeth inclined to the peripheral direction and arranged in a circle about the cutter axis. They require large amounts of relief for cutting clearance and produce a tooth shape depending also on the cutter diameter. The invention provides pairs of cutters, each cutter of the pair finish-cutting one side only of the teeth produced. Relief variation over the cutting profile is reduced and maximum relief angles are diminished with side surfaces of the cutting teeth that converge from front to rear. The tooth shape produced is maintained constant after sharpening, with cutting teeth that have a constant distance from the cutter axis from front to rear. The side surfaces of the cutting teeth are helical surface coaxial with the cutter.
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