Jeremy, The photo is rather small, is the calculator small with tiny print? My eyes like big print.
Just for S&G what does your calculator say for drilling a 1/2" hole in aluminum with a 135° split point? JT On 7/21/2014 12:18 PM, jeremy youngs wrote: > john this is the standby reference that i start with it is a really good > reference and the ONE that i trust most , well worth the 20 bucks. > http://www.ebay.com/itm/Machinists-Speed-Feed-Calculator-CNC-Mill-Tooling-/230704129486?pt=LH_DefaultDomain_0&hash=item35b709a5ce > > > > jeremy youngs > > > On Mon, Jul 21, 2014 at 12:13 PM, John Thornton <bjt...@gmail.com> wrote: > >> I'm writing a little Python program to give me RPM and IPM for twist >> drills. I have found some conflicting and some very old charts for feed >> per revolution like this one: >> >> >> http://www.free-ed.net/sweethaven/IndustrialTech/machinist01/pics/ch04.h1.gif >> >> I use mostly screw machine drills with 135° split point in my mill and >> lathe. Does anyone have a better chart or a formula for feed per rev? >> >> The little program is here: >> >> http://gnipsel.com/files/sfc/ >> >> I still need to add an RPM limit and a zillion other things... >> >> JT >> >> >> ------------------------------------------------------------------------------ >> Want fast and easy access to all the code in your enterprise? Index and >> search up to 200,000 lines of code with a free copy of Black Duck >> Code Sight - the same software that powers the world's largest code >> search on Ohloh, the Black Duck Open Hub! Try it now. >> http://p.sf.net/sfu/bds >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > Want fast and easy access to all the code in your enterprise? Index and > search up to 200,000 lines of code with a free copy of Black Duck > Code Sight - the same software that powers the world's largest code > search on Ohloh, the Black Duck Open Hub! Try it now. > http://p.sf.net/sfu/bds > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
