B - Operations – Transporting – 23 – C
Patent
B - Operations, Transporting
23
C
29/42
B23C 5/12 (2006.01)
Patent
CA 1058925
ABSTRACT OF THE DISCLOSURE The invention provides a hollow mill cutting tool capable of forming a cylindrical pin on one face of a plate member by removing material from the plate member. The cutting tool comprises a generally cylindrical member terminating in a tip portion having a toroidal cross-section and having its axis aligned with the cylindrical member. The inside diameter of the protruding end of the tip portion is selected to be the desired diameter of the cylindrical pin. The tip portion includes a plurality of forward helical surfaces each terminating at a forward end in a cutting edge extending across the thickness of the toroidal cross-section. Each helical surface extends rearwardly along a cylindrical path from the cutting edge at an angle of about 8°-11° with a plane transverse of the axis of the cylindrical member. A back helical surface, which is inclined at an angle of at least 55° to a plane parallel to the axis, is connected to each of the forward helical surfaces. A generally longitudinally-extending surface is connected at one end to the forward end of one of the forward helical surfaces to form a cutting edge, and the other end of each longitudinally- extending surface is connected to the rear end of an adjacent back helical surface.
305051
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