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Hello- > > No, that is incorrect. The pitch (which is more of a relative thing... i.e. > > a coarse vs. fine, etc.) figures into the coefficient in a minor way. > > I disagree. It's not up for agreement or disagreement: it's not an opinion. It's a fact that I'm simply restating. I'm sorry, I mean no offense, but trust me. My education and profession are to know this stuff. Furthermore, I've used it a whole bunch of times to design new elements for applications (including head studs for Porsche, VW, and Corvair applications). > A screw thread is nothing more than an inclined plane wrapped into > a helix. That is correct. It is nominally a 60ΒΌ angle thread, too. > Once you realize this, it is clear that the only thing that makes a > difference is the amount of advancement per turn. Well, that's not correct. > > I'm not pulling this stuff out of my butt. This is from standard mechanical > > engineering formulae. > > Please cite your source. Pick up any standard machine elements text or handbook. They _all_ have it in there. Take care, Shad Laws LN Engineering - Aircooled Precision Performance http://www.lnengineering.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org