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Noncontact Machining Carbide Print Wires

IP.com Disclosure Number: IPCOM000050169D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Clarkson, TJ: AUTHOR [+2]

Abstract

A method for setting up and machining a precision 60 degrees angle on the end of a carbide print wire 11 having a .014 diameter reduces the tip diameter to .008 (Fig. 2). Because of component tolerances the print wire 11 is machined after it has been put in the print wire actuator assembly 10 (Fig. 1).

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Noncontact Machining Carbide Print Wires

A method for setting up and machining a precision 60 degrees angle on the end of a carbide print wire 11 having a .014 diameter reduces the tip diameter to
.008 (Fig. 2). Because of component tolerances the print wire 11 is machined after it has been put in the print wire actuator assembly 10 (Fig. 1).

The print wire actuator assembly 10 (Fig. 1) is loaded in a bushing 16 carried by rotating spindle 15 mounted to the vertical spindle or ram of an electrical discharge machine (EDM) having a rotating electrode 30. The assembly 10 is fed toward the rotating electrode 30 for machining; however, the assembly must first be aligned to provide a precise location of the print wire prior to machining. The print wire actuator assembly is energized to fire the print wire 11 so that the end thereof projects from the assembly. A lens 60 of a 300 power microscope is focused on the end of the print wire 11. The output of the microscope as represented by line 65, appears on a viewing screen 70 which has lines 75 for print wire concentricity adjustment. Adjusting screws 20 are used to move bushing 16 horizontally to bring the print wire concentric to rotating spindle 15 within .0003 of an inch. The end of the print wire is located in the vertical position within .0002 of an inch through the facility of adjusting screw 25 and vertical adjustment line 80 on screen 70.

With the adjustments having been made, the rotating spindle 15 is moved ver...