On Sunday, 27 March 2022 15:31:15 EDT andrew beck wrote: > I currently have a 1000 PPR encoder on it. And that rigid taps great. > > Ideally I would like something similar > > How fast can those sensors read? > > 1000ppr at 10k rpm would be great > > But just thinking about it. I only actually need to be able to read > encoder up to say 2000 rpm
Mine works to 3 grand. But that's multiplied by 7 due the head gearing at the motor shaft where that encoder lives. So my 1 hp rated motor at 90 volts, is turning a hair over 21k revs, with a 125 volt power supply when wide open. And it hasn't even needed brushes in 7 years of that. > > At high speed it doesn't matter In most cases the spindle goes wide open when the encoder or the input stuff on your interface dies cuz its not fast enough. I've had to bypass slow opto's on $20 breakout cards quite a few times. > On Sun, 27 Mar 2022, 22:21 Andy Pugh, <bodge...@gmail.com> wrote: > > > On 27 Mar 2022, at 08:09, andrew beck <andrewbeck0...@gmail.com> > > > wrote: > > > > > > And is bigger dia better for higher resolution? > > > > Probably not, as it will perhaps have more scope to oscillate at > > 10,000 rpm. > > > > Don’t neglect the purely mechanical design of this fast-spinning > > part. > > > > Have you considered optical sensors rather than inductive? > > > > What will be counting the pulses? > > > > LinuxCNC can lathe-thread with one sensor. > > But rigid-tapping is different as it needs to accurately detect the > > reversal point. So you need three channels for index and full > > quadrature. > > > > Work out what error you can accept in the reversal point detection > > (as a fraction of thread pitch) and you can get a feel for how many > > slots you need. > > > > > > > > > > _______________________________________________ > > 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 Cheers, Gene Heskett. -- "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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
