Hello Peter, I'm only scaling the position in hal to test my spindle config. The encoder as you say if fixed at 500000.
El sáb., 21 mar. 2020 a las 1:12, Peter C. Wallace (<p...@mesanet.com>) escribió: > On Sat, 21 Mar 2020, Leonardo Marsaglia wrote: > > > Date: Sat, 21 Mar 2020 00:48:46 -0300 > > From: Leonardo Marsaglia <ldmarsag...@gmail.com> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> > > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net > > > > Subject: [Emc-users] Question about index pulse on high resolution > encoder > > > > Hello guys, > > > > I'm testing a phisical encoder to simulate how the spindle will work with > > the external offsets. So far so good but I need to clarify something > that I > > suspect. Here it comes: > > > > The encoder I'm testing is an ERN471 from Heidenhain. A beast of encoder. > > It says 5.000 line counts on the datasheet but also says it outputs > 125.000 > > signal periods per revolution, so when I read it in LinuxCNC with a scale > > of 1 I find that I'm having 500.000 pulses per turn. A lot of resolution. > > I'm scaling it to 1024 since this is what I have on the Mazak. > > > > My concern is (and I think this is to be expected) that I have missing > > index pulses if I rotate the encoder too fast with my fingers. I tried to > > use a shorter servo-period and that seemed to improve things a little but > > not solving the problem always. > > > > Is this what's happening? Should I not expect this behaviour with the > 1024 > > PPR encoder and the spindle turning at about 200 RPM ? > > > > I would like to hear your thoughts just to be relaxed, since a missing > > index pulse on this kind of processes is likely to break the tool and > > spoil the part. > > > > Thanks as always! > > > Thats looks to be a 5000 line (20000 CPR) encoder with a built in 25X > interpolator to 500000 (20000x25) counts per turn, I would not expect > it to work at high speeds, Depending on interface hardware and setup > > How can you use a scale of 1024? Isnt the encoder a fixed 500000 CPR > device? > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > > _______________________________________________ > 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
