Screw Thread Tools And Gages

Cover Screw Thread Tools And Gages
Screw Thread Tools And Gages
Erik Oberg
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Threads per in. = micrometer reading.
The subject of measuring threads with the wire system is more completely treated in Chapter V.
Thread Tools for Threads with Rounded Top and Bottom While the development of a correct United States or V-thread tool . Is a thing requiring a great deal of skill and patience, it is easy com- pared to the task of producing a tool for the round top and bottom thread, of which the Whitworth and British Association standards are the leading examples. In testing for
... accuracy, threads of this type are not only measured by gages and micrometers, but the curves must match the angle so evenly that when the male gage is tried in the female from either end, no difference can be detected. The difficulty attending this will be the better appreciated when it is known that some of the leading tap and die manufacturers of this country and Europe have failed in producing threads that would pass the British Government's inspection.
It may be laid down as a cardinal principle that the best results are obtained by developing the form first with a flat top and bottom as in the U.


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