Kent A. Reed wrote: > At best I'm a dilettante with machine tools and certainly I'm no expert > with a lathe. That not withstanding, long, long ago, I was taught to cut > a tapered thread on a manual lathe by shifting the tailstock over. It > seems to me this would necessarily mean the thread pitch was measured > "along the hypotenuse" since the line of motion of the saddle is > parallel to that hypotenuse. > Right. and in fact it is wrong, by the definition of the thread pitch. BUT, it is a small enough error in most tapered threads as to not cause any problem. > Not being able to imagine (I said limited brain, remember) how else they > cut tapered threads on a lathe in the old days, I expect the standard > specifications (ASME B1.20.1, fer instance) of the times would reflect this. > The proper way to do this is with a taper attachment, which WILL cut the exact taper parallel to the spindle axis.
I think it is all in Machinery's handbook, of you have one of those. Jon ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
