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Abstract

A method and apparatus for machining pipe collars having internally tapered coaxial threads is accomplished by providing a thread cutting tool having defined thereon a single thread groove forming tooth with first and second thread topping forming portions defined on opposite sides of the thread groove forming tooth. The first and second thread toppings are so designed and oriented with respect to the thread groove forming tooth that the first thread topping forms the top configuration of the first tapered threaded surface simultaneously with cutting the thread groove of the first tapered threaded surface. The second thread topping is so oriented with respect to the threaded groove cutting to that it remains clear of the first thread as the first threaded surface is being formed. While cutting the second tapered threaded surface during completion of a thread cutting path, the second thread topping forms the top configuration of the second thread simultaneously with cutting of the groove of the second thread by the single thread groove cutting tooth. The first thread topping is so oriented with respect to the thread groove cutting tooth as to remain clear of the second thread as the second thread is being cut. The first and second oppositely tapered internal threads of the pipe collar are formed during movement of the thread cutting tool through the pipe collar in a single thread cutting pass.

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First Claim