It works. We are doing it on a deckel FP5 Rigid tapping but only one pass. There is no way of knowing which index pulse will be detected since there are more than one depending on which gear you are in.
Spindle-position is scaled by the exact gear ratio you are in at any given time. On another machine, I built a quad encoder using proximity switches. Only 24 PPR direct on the spindle. Wired to one of the encoder inputs via a line driver IC, this is good up to 500 rpm and I have rigid tapped multiple M3 x 0.5 holes. Henk On Fri, 03 Sep 2021, 18:37 , <emc-users-requ...@lists.sourceforge.net> wrote: > Send Emc-users mailing list submissions to > emc-users@lists.sourceforge.net > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.sourceforge.net/lists/listinfo/emc-users > or, via email, send a message with subject or body 'help' to > emc-users-requ...@lists.sourceforge.net > > You can reach the person managing the list at > emc-users-ow...@lists.sourceforge.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Emc-users digest..." > > > Today's Topics: > > 1. Rigid tapping with geared encoder (andy pugh) > 2. Re: Rigid tapping with geared encoder (Leonardo Marsaglia) > 3. Re: Rigid tapping with geared encoder (Rene Hopf) > 4. Re: Rigid tapping with geared encoder (John Dammeyer) > 5. Re: Rigid tapping with geared encoder (Gene Heskett) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 3 Sep 2021 16:29:55 +0100 > From: andy pugh <bodge...@gmail.com> > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > Subject: [Emc-users] Rigid tapping with geared encoder > Message-ID: > < > can1+yzxwooxwaluwmmuhx3phdn8rygrbc-r651j5xz-eh9d...@mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > I have just advised someone on the forum that he needs a 1ppr index to > rigid tap, as his encoder is mounted to the motor, not to the spindle. > > But then I started wondering if this is technically correct. I have a > feeling that single=pass rigid tapping will be fine, but mutli-pass > won't work? > > Has anyone tried this? > > -- > 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 > > > > ------------------------------ > > Message: 2 > Date: Fri, 3 Sep 2021 13:11:10 -0300 > From: Leonardo Marsaglia <ldmarsag...@gmail.com> > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Rigid tapping with geared encoder > Message-ID: > <CADbXzVN_+5ie9XtgyA5htnWaUFzAiP= > 544uaxz4grzep-rg...@mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > Hello Andy, > > Didn't try rigid tapping but the Mazak has the encoder coupled to the > spindle by means of a timing belt in a 1:1 ratio. So, unless the motor in > that machine is coupled in a synchronized way to the spindle you'll always > have the chance of missing synchronization. Also ,as you pointed out, if > the ratio is not exactly 1:1 you'll eventually have deviation as the > spindle turns (assuming this is a 1 PPR configuration). > > El vie, 3 sept 2021 a las 12:35, andy pugh (<bodge...@gmail.com>) > escribi?: > > > I have just advised someone on the forum that he needs a 1ppr index to > > rigid tap, as his encoder is mounted to the motor, not to the spindle. > > > > But then I started wondering if this is technically correct. I have a > > feeling that single=pass rigid tapping will be fine, but mutli-pass > > won't work? > > > > Has anyone tried this? > > > > -- > > 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 > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > ------------------------------ > > Message: 3 > Date: Fri, 3 Sep 2021 18:12:21 +0200 > From: Rene Hopf <reneh...@mac.com> > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Rigid tapping with geared encoder > Message-ID: <bc469194-0130-4de9-ad85-bd984e541...@mac.com> > Content-Type: text/plain; charset=utf-8 > > > > > On 3. Sep 2021, at 17:32, andy pugh <bodge...@gmail.com> wrote: > > > > ?I have just advised someone on the forum that he needs a 1ppr index to > > rigid tap, as his encoder is mounted to the motor, not to the spindle. > > > > But then I started wondering if this is technically correct. I have a > > feeling that single=pass rigid tapping will be fine, but mutli-pass > > won't work? > > On my haas the encoder is geared 1:2, the index is only seen on every > second rotation. No issues. It only takes longer for the engagement move. > > > > > Has anyone tried this? > > > > -- > > 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 > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------ > > Message: 4 > Date: Fri, 3 Sep 2021 09:15:39 -0700 > From: "John Dammeyer" <jo...@autoartisans.com> > To: "'Enhanced Machine Controller \(EMC\)'" > <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Rigid tapping with geared encoder > Message-ID: <01ce01d7a0de$f0b13c50$d213b4f0$@autoartisans.com> > Content-Type: text/plain; charset="utf-8" > > Andy, > As I recall when it was explained to me is that the index pulse is used > once to start the process. After that the quadrature encoder A/B signals > let the trajectory planner know how fast it's going and in which > direction. I'm not sure if it even requires the index for multipass. > > But then it may also have you that explained it to me... > John > > > > > > -----Original Message----- > > From: andy pugh [mailto:bodge...@gmail.com] > > Sent: September-03-21 8:30 AM > > To: Enhanced Machine Controller (EMC) > > Subject: [Emc-users] Rigid tapping with geared encoder > > > > I have just advised someone on the forum that he needs a 1ppr index to > > rigid tap, as his encoder is mounted to the motor, not to the spindle. > > > > But then I started wondering if this is technically correct. I have a > > feeling that single=pass rigid tapping will be fine, but mutli-pass > > won't work? > > > > Has anyone tried this? > > > > -- > > 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 > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > ------------------------------ > > Message: 5 > Date: Fri, 3 Sep 2021 12:36:24 -0400 > From: Gene Heskett <ghesk...@shentel.net> > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Rigid tapping with geared encoder > Message-ID: <202109031236.24150.ghesk...@shentel.net> > Content-Type: text/plain; charset="utf-8" > > On Friday 03 September 2021 11:29:55 andy pugh wrote: > > > I have just advised someone on the forum that he needs a 1ppr index to > > rigid tap, as his encoder is mounted to the motor, not to the spindle. > > > > But then I started wondering if this is technically correct. I have a > > feeling that single=pass rigid tapping will be fine, but mutli-pass > > won't work? > > > > Has anyone tried this? > > I am doing it on the G0704, encoder is on the spindle motor but I do use > multipass for threading on 1/4" and bigger taps, so my index IS from the > spindle. This does result in some huge scale settings, wnich I switch with > a gear shift tally switches but that doesn't seem to bother LinuxCNC. > > 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) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > ------------------------------ > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------ > > End of Emc-users Digest, Vol 185, Issue 5 > ***************************************** > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
