Entry board for drilling small holes, a method of making the sam

Details Entry board for drilling small holes, a method of making the sam Entry board for drilling small holes, a method of making the sam

1997-02-06

1999-12-14

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408 72R, 408 87, 428610, 428636, 428654, B23B 3500, B23B 4114, B32B 1501, B32B 1520

Patent

active

060008865

ABSTRACT:
An entry board for drilling small holes having a front surface layer made of aluminum or aluminum alloy to be disposed at the drilling inlet side and a back surface layer made of aluminum or aluminum alloy to be disposed at the drilling outlet side. The back surface layer is adhered or joined by clad rolling to said front surface layer. The hardness of the front surface layer is smaller than that of the back surface layer.

REFERENCES:
patent: 3293733 (1966-12-01), Broverman et al.
patent: 4019826 (1977-04-01), Block
patent: 5032468 (1991-07-01), Dumont et al.
patent: 5785465 (1998-07-01), Korbonski
Patent Abstract of Japan, vol. 12, No. 206 (M-708), Jun. 14, 1988 & JP 63 011207A, Jan. 18, 1988.
Patent Abstract of Japan, vo. 16, No.72 (M-1213), Feb. 21, 1992 & JP 03 261549A, Nov. 21, 1991.

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