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On Tue, Apr 14, 2020 at 6:28 PM dave engvall <dengv...@charter.net> wrote: > I was just going to comment that if you have to circular mill then the > initial use of a drill might be faster and safer. > > Dave > > On 4/14/20 4:03 PM, John Dammeyer wrote: > > So if I don't have a center cutting end mill then it's probably a good > idea to drill a hole so that the overlap criteria can be met? I guess plan > the hole in the CNC part drawing? > > > >> -----Original Message----- > >> From: dave engvall [mailto:dengv...@charter.net] > >> Sent: April-14-20 11:37 AM > >> To: emc-users@lists.sourceforge.net > >> Subject: Re: [Emc-users] Non-circular boring. Linuxcnc style. > >> > >> I've never had much luck with plunging end mills full dia. Probably > >> works better with HSS , not so brittle. However, I plunge cut at 40% > >> overlap and 15 - 18 ipm at 2200 with .25 carbide. Get fair life doing > >> that. On the same rather flexible mill using a 1/2" rougher I'm good for > >> .1" radial cuts. That works well when they overlap as in really rough > >> profiling. In general I'm working with 1018 crs or A36.� Doing full dia > >> plunge cuts it is easy to run out of stiffness and power with a 1 hp > >> belt-driven spindle. > >> > >> I still have hopes of getting the Mazak operational again and that will > >> be a game changer. > >> > >> Dave > >> > >> On 4/14/20 10:55 AM, Sam Sokolik wrote: > >>> we have various forms of these type calculators that seem to work well > >>> > >>> > https://www.ebay.com/itm/Vintage-Valenite-SPEED-AND-FEED-CALCULATOR-1981-Datailzer-Slide- > >> Charts/164146745960?hash=item2637e89268:g:V~oAAOSwIGleb93M > >>> On Tue, Apr 14, 2020 at 12:50 PM John Dammeyer <jo...@autoartisans.com > > > >>> wrote: > >>> > >>>> Thanks. The last bit of LinuxCNC milling with a 6mm carbide plunging > into > >>>> HRS broke two of them. I'm really not doing this right yet. So any > >>>> examples of feeds, speeds and coolant are really helpful. > >>>> > >>>> John Dammeyer > >>>> > >>>>> -----Original Message----- > >>>>> From: Sam Sokolik [mailto:samco...@gmail.com] > >>>>> Sent: April-14-20 10:38 AM > >>>>> To: Enhanced Machine Controller (EMC) > >>>>> Subject: Re: [Emc-users] Non-circular boring. Linuxcnc style. > >>>>> > >>>>> sorry - forgot a few things.. The mill was a resharpened at about > .47". > >>>>> (why it took 2 tries to get the size where I wanted it) the timing > gear > >>>>> was aluminum. > >>>>> > >>>>> On Tue, Apr 14, 2020 at 12:26 PM Ed <ate...@mwt.net> wrote: > >>>>> > >>>>>> On 4/14/20 9:53 AM, Sam Sokolik wrote: > >>>>>>> now to upgrade the spindle encoder... > >>>>>>> > >>>>>>> https://youtu.be/VmWeXS6y-lg > >>>>>>> > >>>>>>> On Fri, Apr 10, 2020 at 9:00 PM andy pugh <bodge...@gmail.com> > >>>> wrote: > >>>>>>>> On Sat, 11 Apr 2020 at 02:50, Ed <ate...@mwt.net> wrote: > >>>>>>>> > >>>>>>>>> I'm thinking gear hobs or single cutters. > >>>>>>>> I have been thinking of making gear hobs this way for a while. > What > >>>>>>>> holds me back is that I am not sure that I know how to heat treat > >>>> the > >>>>>>>> hob to a state that will cut the materials that I want to make > gears > >>>>>>>> out of. > >>>>>>>> > >>>>>>>> -- > >>>>>> Heat treating D2 is not a problem here and would work well if a > little > >>>>>> slower than M2 high speed. A higher temp furnace is in the plans. I > >>>> keep > >>>>>> some D2 on hand. > >>>>>> > >>>>>> I am being pushed by a couple customers to get my horizontal/hobbing > >>>>>> machine finished and that will be able to do this kind of work. > Soon I > >>>>>> will be paging Andy to help with the setup. :-) > >>>>>> > >>>>>> Ed. > >>>>>> > >>>>>> > >>>>>> > >>>>>> > >>>>>> _______________________________________________ > >>>>>> Emc-users mailing list > >>>>>> Emc-users@lists.sourceforge.net > >>>>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>>>>> > >>>>> _______________________________________________ > >>>>> Emc-users mailing list > >>>>> Emc-users@lists.sourceforge.net > >>>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>>> > >>>> _______________________________________________ > >>>> Emc-users mailing list > >>>> Emc-users@lists.sourceforge.net > >>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>>> > >>> _______________________________________________ > >>> Emc-users mailing list > >>> Emc-users@lists.sourceforge.net > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
