Rotary drill bit

Details Rotary drill bit Rotary drill bit

B - Operations, Transporting

23

B

77/30

B23B 51/00 (2006.01)

Patent

CA 1203403

- 16 - ABSTRACT OF THE DISCLOSURE The invention provides a rotary drill bit suitable for drilling fiber reinforced plastic, which drill bit comprises a spade drill head comprising a primary cutting edge; a disc-shaped base integral with and axially aligned with the drill head, having a diameter substantially equal to the width of the drill head wherein the radially outer edge of the rearward face of the base is of sufficiently small radius to form a fiber-cutting reverse cutting edge; a reduced diameter portion integral with and axially aligned with the base, having diameter substantially less than that of the base; and preferably, a shank integral with and axially aligned with the reduced diameter portion, having diameter less than or equal to that of the base.

425947

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