On 02/14/2012 11:04 AM, dave wrote: > On Tue, 14 Feb 2012 11:07:05 +0000 > andy pugh<[email protected]> wrote: > >> On 14 February 2012 09:09, Mark Cason<[email protected]> wrote: >>> Can anybody recommend what type and shape of insert to use to >>> turn a 2" piece of pre-hardened 4140? >> >> How hard is it? >> I have found that harder steels give a better finish anyway, and with >> a small cut and a huge surface speed CBN tipped inserts work nicely. >> You probably want to use a tailstock for rigidity. >> >> Look at Youtube for examples of "hard turning" and eBay for >> individual inserts. >> > Kennametal recommendation: > < Rc 48 > fine finish > KT315 85 degree insert > -11 very fine finish -uf fine finish > starting conditions 680 sfm ( range 600 - 900 ) > 0.0015 - 0.006 /rev > doc .003 - 0.03 > > right out of the Kennametal "lathe tooling" > a useful book to have on the shelf. > > From what I can tell CBN works very well above Rc 48 but I have no > experience. > > Dave
Thank you Dave, I downloaded several catalogs from them. Interesting reading, more than I can absorb in a day :) -- -Mark Ne M'oubliez ---Family Motto Hope for the best, plan for the worst ---Personal Motto ------------------------------------------------------------------------------ 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
