On 15 June 2015 at 20:33, Gene Heskett <ghesk...@wdtv.com> wrote: > I've done quite a bit of googling, and read the older threads here, but > the closest I've come is an included angle in the 14 degree area, or 7 > degrees off axis in cnc terms. No one has discussed the effect of > dissimilar metals that I have noted in skimming about 65 old messages or > in the google outputs.
It seems likely that the threshold angle is the arctan of the coefficient of friction between the materials. Looking in the tables, ( http://www.engineershandbook.com/Tables/frictioncoefficients.htm ) hardened steel on hardened steel, lubricated, has a mu of .11 so should lock at angles below 6 degrees even with lubrication. (which sounds plausible, though I am not sure about the lubrication of a machine taper) Dry aluminium on mild steel is listed as a mu of 1.05, so that suggests it should lock at an angle of 45 degrees. Whether these would be half-abgles or included angles I can't decide. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
