Sam, what are the max velocity and acceleration on the Z axis? It looks like 0.5 in / sec and 20 in/sec^2 from the plots. I want to match my sim configuration to yours.
On Sat, Nov 26, 2016, 2:03 PM Robert Ellenberg <rwe...@gmail.com> wrote: > Ahh, I'll take another look at the math, clearly it's not calculating the > max RPM correctly. > > On Sat, Nov 26, 2016 at 12:39 PM sam sokolik <sa...@empirescreen.com> > wrote: > > ok.. Here is some oddness...... > > If I use the original pitch of P.059055 I get the error saying the > spindle should be running at 237rpm (the error I always get). > > pitch of .05 I don't get the error .06 I don't get the error.... .07 I > do get the error (but it threads at 19ish ipm) same error saying spindle > should be running at 237 > > sam > > On 11/26/2016 11:19 AM, sam sokolik wrote: > > Here are 2 screenshots showing the threading at 15ipm and the shuttle at > 30. > > > > http://electronicsam.com/images/KandT/testing/robthreading/threading.png > > http://electronicsam.com/images/KandT/testing/robthreading/shuttle.png > > > > So I am not understanding why the threading would think that 237 is the > > maximum feed. > > > > Side note - this is running rt_preempt and uspace. A base thread of > > 50us seems to work fine with the printer port. > > > > sam > > > > > > On 11/25/2016 09:24 PM, sam sokolik wrote: > >> that is odd because the threading is done at about 16ipm - and the max > >> velocity of the axis is 30ipm... (you can see the z velocity goes > >> higher than 16ipm in the plots) > >> > >> If there is anything else that would help to plot - let me know > >> > >> sam > >> > >> On 11/25/2016 08:25 PM, Robert Ellenberg wrote: > >>> Nice work! The message you're getting in axis is a new feature I > added. It > >>> warns you if the combination of spindle speed and thread pitch would > >>> require more than 90% of your maximum axis velocity. If so, it slows > the > >>> spindle down to a safe maximum speed before starting the thread (in > this > >>> case 230RPM). The 90% value is arbitrary, I just wanted to have some > safety > >>> factor in there. > >>> > >>> Comparing the two acceleration plots, it seems like the acceleration > during > >>> the start of the thread is higher in stock 2.7 than with my branch/ The > >>> high initial acceleration is good, though, since it settles in about > 120ms, > >>> whereas the new branch takes about 200ms. I'll run the same program in > >>> simulation tomorrow and see if I can reproduce the effect. It may be > worth > >>> trying the same comparison in G61 (in case blending is causing it). > >>> > >>> Best, > >>> Rob > >>> > >>> On Fri, Nov 25, 2016 at 8:37 PM sam sokolik <sa...@empirescreen.com> > wrote: > >>> > >>>> ok - I finally did some testing on the emco using this branch.. > >>>> > >>>> > >>>> > https://github.com/robEllenberg/linuxcnc-mirror/commits/feature/nominal-vel-during-sync > >>>> > >>>> This is a thread using this program > >>>> http://electronicsam.com/images/KandT/testing/robthreading/test.ngc > >>>> > >>>> This is the current 2.7 behavior > >>>> > http://electronicsam.com/images/KandT/testing/robthreading/current.png > >>>> > >>>> This is with robs fixes > >>>> > http://electronicsam.com/images/KandT/testing/robthreading/robnew1.png > >>>> > >>>> It looks like the acceleration spike are defiantly smaller. > >>>> > >>>> I did find an oddity on both branches - quite often it seemed to > >>>> overshoot initially and then slow back down. I don't know if it is an > >>>> artifact of my config (100 line single channel encoder + index. never > >>>> seemed to effect the threading I have done. > >>>> > >>>> > http://electronicsam.com/images/KandT/testing/robthreading/current1.png > >>>> http://electronicsam.com/images/KandT/testing/robthreading/robnew.png > >>>> > >>>> Also - rob - it prints in axis every pass velocity at line 8 is 230rpm > >>>> or such.. (paraphrasing..) > >>>> > >>>> sam > >>>> > >>>> > >>>> On 09/25/2016 07:47 AM, Robert Ellenberg wrote: > >>>>> Hi All, > >>>>> > >>>>> Recently, I found a way to reduce the acceleration / velocity jitter > >>>> during > >>>>> threading and tapping motions (see this issue on github > >>>>> <https://github.com/LinuxCNC/linuxcnc/issues/164> and the > >>>>> feature/spindle-sync-jiiter-fix branch > >>>>> < > >>>> > https://github.com/robEllenberg/linuxcnc-mirror/tree/feature/spindle-sync-jitter-fix > >>>>> ). > >>>>> The effect looks significant on the HALscope, but I'm not sure how > much > >>>> of > >>>>> a difference it would make on a real machine. Is anyone interested in > >>>> doing > >>>>> a before and after test on real hardware? > >>>>> > >>>>> Thanks! > >>>>> Rob > >>>>> > >>>> > ------------------------------------------------------------------------------ > >>>>> _______________________________________________ > >>>>> Emc-developers mailing list > >>>>> Emc-developers@lists.sourceforge.net > >>>>> https://lists.sourceforge.net/lists/listinfo/emc-developers > >>>>> > >>>> > ------------------------------------------------------------------------------ > >>>> _______________________________________________ > >>>> Emc-developers mailing list > >>>> Emc-developers@lists.sourceforge.net > >>>> https://lists.sourceforge.net/lists/listinfo/emc-developers > >>>> > >>> > ------------------------------------------------------------------------------ > >>> _______________________________________________ > >>> Emc-developers mailing list > >>> Emc-developers@lists.sourceforge.net > >>> https://lists.sourceforge.net/lists/listinfo/emc-developers > >>> > >> > ------------------------------------------------------------------------------ > >> _______________________________________________ > >> Emc-developers mailing list > >> Emc-developers@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-developers > >> > > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > > Emc-developers mailing list > > Emc-developers@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-developers > > > > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers > > ------------------------------------------------------------------------------ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
