[EMAIL PROTECTED] wrote: > I need to (order reversed to put the easy one first)
> 2) Cut fine threads on small diameter tubes. Just about any lathe will do. If the spindle thru-hole is larger than the workpiece diameter, workholding easy, since you can chuck it up with just the end to be threaded sticking out. > 1) cut very fine threads on largish diameter tubes. (about 6" diameter > pipe/tubing. Inside and outside thread.). How long? If the parts are "ring-like" (length less than diameter) then you can use anything that can chuck and swing them. But if they are "pipe-like (length significantly greater than diameter), you either need a long bed lathe and a steady rest, or a lathe with a truly huge hole thru the center of the spindle. Spindle speed is also an issue - 6" diameter is approximately 1.5 foot circumference. For 100 SFPM cutting speed (HSS cutter, steel workpiece), you'd need a spindle speed of 66 RPM. Carbide cutters and aluminum workpieces would let you go faster, but you still are looking at the low end of a typical "small lathe" spindle speed range. Regards, John Kasunich ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
