Tap process for hard workpieces

Metal working – Means to assemble or disassemble – Tool chuck and tool

Reexamination Certificate

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Details

C029S466000, C029S468000, C033S639000, C248S629000

Reexamination Certificate

active

11257200

ABSTRACT:
A process and apparatus for producing screw threads in hard material workpieces with a series of taps. The present invention employs a threaded bore formed in a bracket assembly to align and position multiple taps on a rotary machine. The taps are used in sequence to cut threads progressively deeper into a substrate. The present invention provides a method of aligning and orienting each progressive tap to begin its cut at the same initial starting point.

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Vermont Tap & Die Corporation, Catalog No. 43, Mar. 1943, pp. 18 and 19.

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