Quote:
Originally Posted by DUUANE
what Lynn was saying about rolled threads is correct.But would the high speed ball milling of the cnc making a round bottom thread root create the same kind of stress riser as a lathe cut thread?They should also be post forming heat treated too right?hmm....
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The issue isn't just the shape of the thread root but the rolling process forms the grain stucture of the metal as opposed to interrupting it as a cut thread does.
As comment, they did experiment with press in studs on the CMP wheels and found that the wheel material was too thin to properly hold the studs (hard to believe when we see how heavy the CMP wheels are compared to modern, but they ran tests and had failures...) so they found they had to keep the welded in studs.
11-12-09, 14:03
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