On Tue, 24 Jan 2012 16:09:34 -0500, you wrote:
>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. Hi Kent Commercially taper threads were mostly bulk cut on repetition lathes using die heads or fitted with taper turning attachments. (At least where I worked) We made gas and water fittings of all types and sizes in iron, brass, bronze and gunmetal. Thread pitches on taper threads are measured exactly the same as parallel threads - ie along the Z axis (CNC parlance). NOT along the taper. My CAM programs know this, and cut the threads accordingly - unfortunately they turn out wrong. On small NPT or BSP threads the error induced by incorrect application of LinuxCNC's taper turning is small, but gets worse as the diameter and taper increases. Certainly wouldn't pass inspection without correction with my clients... Steve Blackmore -- ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
