Method of producing holes free of accretions in circuit boards m

Details Method of producing holes free of accretions in circuit boards m Method of producing holes free of accretions in circuit boards m

1978-09-15

1980-02-26

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408230, 408704, 279 6, B23B 5102

Patent

active

041903862

ABSTRACT:
A method is disclosed for producing accretion-free holes with a diameter of less than 1.5 mm in circuit boards made of plastic. A hard metal drill is employed having a cylindrical chucking shank and a fluted twist section. A central axis of the twist section of the drill is moved eccentrically in relation to a central axis of rotation and therefore to a central axis of the drilled hole while drilling such that a widening of the hole occurs which is at least 20/.mu.m but not more than 50/.mu.m.

REFERENCES:
patent: 2396335 (1946-03-01), Moller
patent: 3739461 (1973-06-01), Cupler
patent: 3947143 (1976-03-01), Gulla

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