Drill for synthetic fiber filled plastic and like materials

Details Drill for synthetic fiber filled plastic and like materials Drill for synthetic fiber filled plastic and like materials

1995-05-04

1997-06-10

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

407 54, 407 59, 408230, 408 1R, B23B 5102

Patent

active

056369484

ABSTRACT:
A drill for fiber-filled synthetic plastics has an axially extending body with helical grooves spiraling from a drill point toward a shank end. The grooves define helical lands between them having helical land machining edges. At the point axially tapering land and groove point surfaces converge and land point surfaces with machining edges are radiused to merge gradually with the land surfaces rearward of them. The land machining edges are configured with a negative rake. A plurality of cross notches on the lands extending over an axially extending region of the lands from substantially the axially tapering land point surfaces a predetermined distance toward the shank end are configured to create fiber-snipping crosswise helical cutting edges with a positive rake facing the point.

REFERENCES:
patent: 3147646 (1964-09-01), Rawcliffe, Jr.
patent: 3244034 (1966-04-01), Severdia
patent: 3443459 (1969-05-01), Mackey et al.
patent: 3667857 (1972-06-01), Shaner et al.
patent: 4957397 (1990-09-01), Huff
Fluting Specifications, p. 1, Warehouse to the Nation. (Date of publication unknown -- but prior art).
Fullerton Tool Catalog 93. (Date of publication unknown -- but prior art).

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