On Tuesday, February 14, 2012 03:27:03 PM dave did opine: > On Tue, 14 Feb 2012 12:25:31 -0600 > > Jon Elson <el...@pico-systems.com> wrote: > > dave wrote: > > > I suspect the only reason to use carbide is that small HSS mills are > > > really flexible. > > > > Well, it is both a hardness/wear resistance issue and a stiffness > > issue. I VERY rarely > > use small HSS tooling for this reason. Our shop at work is guys from > > the "old school" > > and almost never use carbide on the mill (use lots of indexable > > carbide on the lathe). > > I remember watching them make something for me a while ago with a > > 1/16" HSS end mill, and I swear the tip of the end mill was tilted 30 > > degrees from straight. > > I suggested carbide but they didn't have any, so they had FITS > > getting that slot to > > the right dimension. > > > > > Even though my mill has serious backlash I can climb mill with > > > small mills, eg. <= .25". I have had occasional trouble with a .5 > > > rougher but I had really buried it. I can climb mill with .5 > > > carbide roughers on steel if I take a light cuts like 50 to 100 > > > thou. > > > > I used to make climb cuts with great trepidation on my manual > > Bridgeport, as it > > has .030" blacklash on X and .050"+ on Y. Now, I make practically > > all cuts in the climb direction except when going back and forth > > cleaning up the side of some piece. > > > > Jon > > GOOD GRIEF!! and I thought 0.003 on X and Y was bad. > You stole my line, Dave. :) When I get above 4 thou, its adjust things time again.
> If I'm lucky I can go hold the piece so I can go all the way around > climb-cutting. I seem to be doing more where I rough with a .500 and > clean up with 0.25" carbide. Of course the doc is limited. > > Dave Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Turnaucka's Law: The attention span of a computer is only as long as its electrical cord. ------------------------------------------------------------------------------ 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
