Process for making a minute hole

Details Process for making a minute hole Process for making a minute hole

1976-09-28

1977-08-30

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412935, C25F 302, C25F 304, C25F 306

Patent

active

040453111

ABSTRACT:
An inexpensive process for making a minute circular hole having a smooth peripheral edge in a thin wall of a metal article. A depression is formed on one surface of the wall so as to simultaneously form a projection on the other surface thereof. The apex of the projection is positioned in a spaced relationship to a cathode in an electrolyte. An electric current is then introduced between the projection, which serves as an anode, and the cathode, which acts to selectively and anodically dissolve the apex of the projection so as to form a minute hole in the wall.

REFERENCES:
patent: 2476965 (1949-07-01), Emerson et al.
patent: 2496299 (1950-02-01), Mansfield et al.
patent: 3325384 (1967-02-01), Frantzen

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