No. A slot is still a hole. So if you are counting, say falling edges, you will get 5 of them. If you count rising edges you will get 5 of them.
Now if you measure the time between falling and rising edges you will get one timer interval that is much longer than the others. The actual time doesn’t matter other than that it's a constant ratio between the small holes and the slot. That gives you the index position and the time interval of the shorter pulses gives you RPM. You really only need rising edges and the time between them unless you are tracking both directions. John > -----Original Message----- > From: Martin Dobbins [mailto:tu...@hotmail.com] > Sent: September-19-22 7:12 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] missing tooth index questions.. > > Dyslexia rules ko? > > In your illustration I count 4 holes and 1 slot (made of 2 holes), so if a > slot is not a hole there are 4 holes? > ________________________________ > From: John Dammeyer <jo...@autoartisans.com> > Sent: Sunday, September 18, 2022 5:49 PM > To: 'Enhanced Machine Controller (EMC)' <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] missing tooth index questions.. > > Much easier to visualize if you use less holes I think? > > I first made 6 holes and then laid out two arcs and created a longer slot > from two of the holes. > > I count 5 holes and 5 spaces between the holes. Are you sure you actually > cut 100 holes? > > John Dammeyer > > > > -----Original Message----- > > From: Sam Sokolik [mailto:samco...@gmail.com] > > Sent: September-18-22 1:51 PM > > To: Enhanced Machine Controller (EMC) > > Subject: [Emc-users] missing tooth index questions.. > > > > I have a optical encoder from a mouse running on an emco encoder wheel (100 > > holes). I cut out the metal between 2 holes. I think that would be > > considered one missing tooth... I have the encoder scale set to 100 and > > the missing tooth set to 1 > > > > I have a little comp that sets the index enable to true whenever it is > > false. > > > > Looking at the halscope screen shot - it only counts to 98.. I would think > > it would count from 0 to 99. You can see the gap is seen - but I think > > there should be an extra count in there.. > > > > (I could be not understanding it too) > > > > ps - if I set the missing teeth to 2 - it will not trigger (like it doesn't > > see the gap then which seems correct) > > > > thanks! > > sam > > _______________________________________________ > 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
