Annular hole cutter

Details Annular hole cutter Annular hole cutter

B - Operations, Transporting

23

B

77/31

B23B 51/00 (2006.01) B23B 51/04 (2006.01)

Patent

CA 1206781

ANNULAR HOLE CUTTER Abstract of the Disclosure An annular hole cutter wherein each tooth is formed with a radially outer cutting edge and at least alternate teeth are formed with radially extending, cir- cumferentially staggered inner and outer cutting edges. The bottom face of each tooth is formed with oppositely radially inclined inner and outer back-off faces which intersect in a downwardly extending crest which in turn intersects the radially outer cutting edge. The outer back-off faces of alternate teeth are vertically reliev- ed relative to the outer back-off faces of the inter- mediate teeth and the inner back-off faces of the inter- mediate teeth are vertically relieved relative to the inner back-off faces of the alternate teeth a distance greater than the chip load at which the cutter is operated. In the preferred form, the radially inner portion only of the unrelieved inner back-off face is relieved to a greater extent than the relieved inner back-off faces.

436610

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