Machining opposite surfaces of a workpiece to be parallel to one

Details Machining opposite surfaces of a workpiece to be parallel to one Machining opposite surfaces of a workpiece to be parallel to one

1994-06-16

1997-07-15

Briggs, William

Gear cutting, milling, or planing

Milling

Process

269 47, 409217, 409903, 451364, B23Q 306

Patent

active

056477040

ABSTRACT:
Parallelism between of two opposite surfaces of a workpiece is assured by referencing off of three features on the edge(s) of the workpiece, the three edge features establishing a single, unique plane within the workpiece for referencing the machining operations performed on the two opposite surfaces of the workpiece. The workpiece is held by corresponding two sets of three fixture points, above the surface of two corresponding fixtures, or of one compound fixture, while machining the two opposite surfaces. In this manner, problems associated with referencing off of the first machined surface, to machine the second surface, are completely avoided. This is particularly useful when machining the opposite faces of an automatic transmission valve body. The one set of fixture points is identical to the other set of fixture points, to ensure accurate positioning of the workpiece from fixture-to-fixture (or from set of fixture points to set of fixture points, in a compound fixture).

REFERENCES:
patent: 4448405 (1984-05-01), Cipolla
patent: 4601110 (1986-07-01), Donaldson
patent: 4678169 (1987-07-01), Fishman
patent: 4915367 (1990-04-01), Carossino
patent: 5064321 (1991-11-01), Barnes
patent: 5234295 (1993-08-01), Jackson et al.
patent: 5375951 (1994-12-01), Veale

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