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:[email protected]] > Sent: April-14-20 11:37 AM > To: [email protected] > 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 <[email protected]> > > 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:[email protected]] > >>> 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 <[email protected]> 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 <[email protected]> > >> wrote: > >>>>>> On Sat, 11 Apr 2020 at 02:50, Ed <[email protected]> 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 > >>>> [email protected] > >>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>>> > >>> _______________________________________________ > >>> Emc-users mailing list > >>> [email protected] > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
