On Friday 05 February 2021 10:27:30 Jon Elson wrote: > On 02/05/2021 03:15 AM, Gene Heskett wrote: > > On Friday 05 February 2021 02:57:38 John Dammeyer wrote: > >> Granted this subject is a bit old I've now had some time to dive > >> back into the TI F2837xD which has dual processors and other > >> features that will make it a good test bed for trying out stuff. > >> > >> It has a hardware Quadrature Encoder Interface (QEI) so > >> theoretically I should be able to grab encoder counts in any > >> resolution and calculate spindle position relative to Z axis > >> position and create moves to track. > >> > >> I'll report back when I have some more information. > >> John > > > > As has been told to me, its the time delay between starting the z on > > the passing index, until z has reached the synchronous speed and is > > then locked at whatever phase exists when sync speed has been > > achieved > > No, I'm pretty sure this is not correct. The Z is locked to > the spindle position when the index pulse was detected. > This requires the Z to accelerate PAST the required speed to > follow the thread for a moment, and that's why you want to > cut air for a bit before the tap enters the workpiece. It > is also why you need to leave substantial headroom on the Z > speed to match the tapping velocity. > > Jon
You have my curiosity bump itching Jon, When I get my stuff back together on the GO704, and get my new 'scope unpacked, I'll take a look at the step drive output and answer that itch. I just bought a $3200 10.5" display Siglint 4 channel scope. Its at a DHS warehouse/terminal in Cleveland or Cinci ATM. Promised by Teusday next. I'm in the middle of getting my machines all running from the same model of dell computer, carrying a 4 core i5 at 1600 MHZ, I bought 4 of them off lease for $150/copy, and have some kin in the house helping clean up after my wifes passing. So it may be a week or more. Stay safe and well. 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> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
