> > As a roughing cut thats pretty decent. Can your X move like that while > loaded with the grinders weight? My grinder is a 1/4 shank and several > lbs. With an 8mm x screw, that much weight would be pushing that screw > pretty hard. >
I didn't weigh the entire X chariot so I'm dimensioning it just based on other machines of similar size. I'm using a 40 mm ballscrew (ground or rolled that's yet to be determined) with 5 mm of lead. That will be commanded using a 3.8 KW servo motor which can output 15 NM of nominal torque. Since this is a grinder and the part is going to spin slower than a turning operation I really don't mind a lot about max speed on the X axis but more about max acceleration. El vie, 2 ago 2024 a las 14:37, gene heskett (<[email protected]>) escribió: > On 8/2/24 12:23, Leonardo Marsaglia wrote: > > Hello Gene, I hope you're doing well! > > > > Here is a little footage of the fastest I've moved the X axis on the > mazak: > > https://youtube.com/shorts/fx6Elmy2GB4?si=oYQ7x1yheyhZOh5- > > As a roughing cut thats pretty decent. Can your X move like that while > loaded with the grinders weight? My grinder is a 1/4 shank and several > lbs. With an 8mm x screw, that much weight would be pushing that screw > pretty hard. > > > > > > > > > Being almost a square and considering the circunscribed diameter is about > > 37 mm is pretty good. For the X axis I have a max speed of 500.0 mm/sec > and > > 10000.0 mm/sec^2 of max acceleration. I kind of have to correct the jerk > > for this axis because for some shapes I can notice it's a little too > much. > > But for the most part I'm ok with the way it works. > > Yes, makes it look easy. > > >> I have done that, but the spindle speed is suprisingly slow if X is > slow. > >> > > > > Well, I'm designing this machine to have a slight better response than > the > > Mazak, but also being a grinding machine I don't really need that much > RPMs > > on the part spindle so for the majority of parts we make it will be ok. > > I'll be posting videos as soon as the machine is ready! > > I might add that my Sheldon is the first machine I put the > stepper/servo's on. They doubled the speeds. > > > > > > > > El vie, 2 ago 2024 a las 12:55, gene heskett (<[email protected]>) > > escribió: > > > >> On 8/2/24 10:52, gene heskett wrote: > >>> On 8/2/24 05:45, Leonardo Marsaglia wrote: > >>>>> > >>>>> So this would also work for a mill that has an AC Servo running > >>>>> step/dir. > >>>>> Once the motor is connected to the spindle with a toothed belt > >>>>> rather than > >>>>> V belt. > >>> > >>> I must be missing some context here. I have been feeding back for > >>> spindle speed control, an encoder generated ABX set of quadrature > >>> signals generated by ats-667's which are watching the spindle backgear > >>> teeth go by, for about a decade. What has the presence or absence of a > >>> v-belt in the path got to do with it?. > >>>>> Cool! > >>>>> > >>>> > >>>> I have the same doubt about the kind of belt I should use. In theory, > >>>> several V belts well tensioned should work perfectly without slipping > >> and > >>>> the encoder on the spindle (this one of course coupled with a timing > >>>> belt) > >>>> should be able to keep up with the position and nothing should go > wrong. > >>>> The lathes we have all work this way and I have never experienced belt > >>>> slipping. But for some reason I feel more confident using timing belts > >>>> all > >>>> the way. I don't know if this is an overkill and I should go with the > >>>> simpler V belts. Remember that this machine is going to be grinding > cams > >>>> and eccentrics. > >>>> > >> I have done that, but the spindle speed is suprisingly slow if X is > slow. > >> > >>>> El vie, 2 ago 2024 a las 6:33, Leonardo Marsaglia > >>>> (<[email protected]>) > >>>> escribió: > >>>> > >>>>> Thanks Andy for the link! Now it's time to play a little bit with the > >>>>> config and make it work :) > >>>>> > >>>>> El dom, 28 jul 2024 a las 6:21, andy pugh (<[email protected]>) > >>>>> escribió: > >>>>> > >>>>>> On Sat, 27 Jul 2024 at 18:41, Leonardo Marsaglia > >>>>>> <[email protected]> > >>>>>> wrote: > >>>>>> > >>>>>>> For this, I think I read there's a caxis.comp module that If I'm > not > >>>>>>> mistaken Andy wrote. > >>>>>>> > >>>>>>> Is there a place to get that file? Because I couldn't find it yet. > >>>>>> > >>>>>> > >>>>>> > >> > https://forum.linuxcnc.org/10-advanced-configuration/42171-spindle-step-dir-servo-ramp-down-before-stop-on-m-stop-command?start=120#209694 > >>>>>> > >>>>>> > >>>>>> -- > >>>>>> atp > >>>>>> "A motorcycle is a bicycle with a pandemonium attachment and is > >>>>>> designed for the especial use of mechanical geniuses, daredevils and > >>>>>> lunatics." > >>>>>> — George Fitch, Atlanta Constitution Newspaper, 1912 > >>>>>> > >>>>>> > >>>>>> _______________________________________________ > >>>>>> 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 > >>> > >>> Cheers, Gene Heskett, CET. > >> > >> Cheers, Gene Heskett, CET. > >> -- > >> "There are four boxes to be used in defense of liberty: > >> soap, ballot, jury, and ammo. Please use in that order." > >> -Ed Howdershelt (Author, 1940) > >> If we desire respect for the law, we must first make the law > respectable. > >> - Louis D. Brandeis > >> > >> > >> > >> _______________________________________________ > >> 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 > > Cheers, Gene Heskett, CET. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > > > > _______________________________________________ > 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
