On Sunday 28 April 2019 14:03:21 Gene Heskett wrote: > On Sunday 28 April 2019 10:53:49 Peter C. Wallace wrote: > > On Sun, 28 Apr 2019, Gene Heskett wrote: > > > Date: Sun, 28 Apr 2019 10:47:13 -0400 > > > From: Gene Heskett <[email protected]> > > > Reply-To: "Enhanced Machine Controller (EMC)" > > > <[email protected]> > > > To: [email protected] > > > Subject: [Emc-users] stretch testing install Q > > > > > > Greetings; > > > > > > As I wrote yesterday except for two things. > > > > > > 1. It won't let me run synaptic from anyplace but its own > > > keyboard. 2. Very consistent and poor latency in the 53 > > > microsecond range. > > > > > > Something in pam is stopping synaptic. > > > > > > And is there anything I can put in the kernel command line that > > > will improve the latency? > > > > > > To PCW, is that latency enough to bother a 5i25|7i76 combo where > > > there is no base thread? > > > > > > It seems to be quite consistent, you can clear the stats and its > > > back above 50 u-s by the time you've unclicked the mouse. And I > > > just noted that removing the base-thread drops the servo to around > > > 30 u-secs. > > > > 100 usec is usually fine for Mesa PCI hardware and even 500 usec > > would be OK if the DPLL is used to retime things like encoder count > > and step count sampling > > ISTR seeing that in the 5i25 docs someplace. I think I was using it in > a previous config. I think I am using that in the pi<spi>7i90 on the > Sheldon as the pi's latency is known to be over 100 u-secs regularly. > yes, in the .hal file for a 7i90HD: > > setp hm2_[HOSTMOT2](BOARD).0.dpll.01.timer-us -150 > > is that the right syntax for a 5i25? Must be, it just accepted a -50 > according to the startup log on the G0704. The other 2 machines are > running on 5i25's and D525MW mainboards with 6 u-secs max latency. > > Latency-test measurements on the pi are probably confused. in real > life as theres a 2nd, very slow thread also running on the pi, > handling the joggin and such functions. I have a pair of the MPJA 100 > ppa dials mounted on its apron to replace the old manual cranks, and a > 100 to 200 millisecond thread handles all that extra stuff nicely with > no noticeable lag between my hand and the machines reaction. Saves a > lot of cpu cycles by not running that stuff at servo-thread rate. ISTR > we discussed that before. > > I do need to change the jog mode though, I can wind it up way too easy > and crash it, breaking tooling. Theres a mode where it stops when I > stop and I need to convert to that. The DRO's track whatever the > machine does in either event if I understand it right. From man > motion: > > axis.L.jog-vel-mode IN BIT > When FALSE (the default), the jogwheel operates in position mode. > The axis will move exactly jog-scale units for each count, regardless > of how long that might take. When TRUE, the wheel operates in velocity > mode - motion stops when the wheel stops, even if that means the > commanded motion is not completed. > > The latter would be better I think. But what does that do to the size > of the jog per click that I went to quite some length to setup? .0002" > to 20 thou a click. ??? The theory was that I could jog right close > to position, then reduce the jog size to almost zip and fine tune it > to the correct size. > > I'll give it a shot anyway. :) > And I think it finally dawned on me that when calibrating the x scale on a lathe, that I ought to be in g8 mode when moving by a dial indicator, which would explain why, when I want and inch, measure the work an touch it off at the measurement, take a 20 thou cut to get to the target size, and its still 10 thou too big.
Sometimes the blindingly obvious isn't. :( So I'll go recheck the x scale, it probably needs doubled. > Thanks Peter and all. > > > > 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) > > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > [email protected] > > > 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 > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > Cheers, Gene Heskett 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) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
