Method and apparatus for punching a cross hole

Details Method and apparatus for punching a cross hole Method and apparatus for punching a cross hole

1990-12-10

1992-04-21

Phan, Hien H.

Cutting

Processes

With reorientation of work between cuts

83 50, 83 55, 83255, 83405, B26D 1100, B26F 102

Patent

active

051056968

ABSTRACT:
A method and apparatus are disclosed for punching a cross hole in a workpiece with minimal or no distortion of the hole and the workpiece. According to the method, a cross hole of a given diameter is punched in a workpiece by punching a first hole having a diameter less than the given diameter in the workpiece from a first side thereof, and then punching the first hole again but from a second side of the workpiece opposite the first side at nominally the given diameter to produce the cross hole having the given diameter.

REFERENCES:
patent: 2371734 (1945-03-01), Buttress
patent: 2419862 (1947-04-01), Wales
patent: 2508758 (1950-05-01), Hollerith
patent: 3232156 (1966-02-01), Fuller
patent: 3566513 (1971-03-01), Fuller
patent: 4477537 (1984-10-01), Blase et al.

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