Method of manufacturing a master for the fabrication of projecti

Details Method of manufacturing a master for the fabrication of projecti Method of manufacturing a master for the fabrication of projecti

1990-05-15

1991-11-26

Schmidt, Frederick R.

Turning

Lathe

Carriage feed

407 69, 407 70, B23G 502

Patent

active

050673777

ABSTRACT:
A method of manufacturing a master for projection screens, according to which a pattern of parallel rectilinear grooves and ribs is formed on one side of a plate of machinable material by a slotting operation performed by means of a profile chisel. The grooves (33) are formed in several different tooling steps, with several grooves being tooled simultaneously. The profile chisel is of multiple construction and is composed of three subchisels, i.e. a precutting chisel, a cutting chisel (13) and a finishing chisel.

REFERENCES:
patent: 180409 (1876-08-01), Alvord
patent: 3180006 (1965-04-01), Emmons
patent: 3455002 (1969-07-01), Miller
patent: 4233867 (1980-11-01), Zimmerman
patent: 4409868 (1983-10-01), Huddle et al.

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