Method for forming precision clockplate with pivot pins

Details Method for forming precision clockplate with pivot pins Method for forming precision clockplate with pivot pins

2007-06-18

2010-06-01

Evans, Geoffrey S (Department: 3742)

Electric heating

Metal heating

Cutting or disintegrating

Reexamination Certificate

active

07728248

ABSTRACT:
Methods are disclosed for producing a precision clockplate with rotational bearing surfaces (e.g. pivot pins). The methods comprise providing an electrically conductive blank, conventionally machining oversize features comprising bearing surfaces into the blank, optionally machining of a relief on non-bearing surfaces, providing wire accesses adjacent to bearing surfaces, threading the wire of an electrical discharge machine through the accesses and finishing the bearing surfaces by wire electrical discharge machining. The methods have been shown to produce bearing surfaces of comparable dimension and tolerances as those produced by micro-machining methods such as LIGA, at reduced cost and complexity.

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Qu, J., et al., “Development of the Cylindrical wire Electrical Discharge Machining Process, Part 1: Concept, Design, and Material Removal Rate”, Transactions of the ASME, vol. 12, Aug. 2002, pp. 702-707.
Fleischer, J., et al., “New Applications for micro-EDM”, Journal of materials Processing Technology, vol. 149, pp. 246-249, 2004.

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