If you want spindle positioning (for more accurate probing of alignment for tool changes for examples) you'll need the encoder to follow the position at all speeds. Are there high RPM capable absolute encoders at a reasonable price?
-----Original Message----- From: andrew beck <[email protected]> Sent: March 27, 2022 3:31 PM To: Enhanced Machine Controller (EMC) <[email protected]> Subject: Re: [Emc-users] Homebuilt encoder 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 At high speed it doesn't matter On Sun, 27 Mar 2022, 22:21 Andy Pugh, <[email protected]> wrote: > > > > On 27 Mar 2022, at 08:09, andrew beck <[email protected]> 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 > [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
