it is actually 10in/s^2 but correct on .5in/s velocity On 11/26/2016 01:26 PM, Robert Ellenberg wrote: > 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 >
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