threading and feed/rev use 2 different things... Threading uses: (encoder position) motion.spindle-revs IN FLOAT For correct operation of spindle synchronized moves, this signal must be hooked to the position pin of the spindle encoder.
FPR uses: (revolutions/second - encoder velocity) motion.spindle-speed-in IN FLOAT Actual spindle speed feedback in revolutions per second; used for G96 (constant surface speed) and G95 (feed per revolution) modes. So it is 2 different things - one could work without the other.. Sam On 12/9/2014 8:59 AM, Karl Jacobs wrote: > Yes, I know that limitation on the Beaglebone, so I do not expect to > operate it with a higher resolution encoder (in fact, just one index > mark fedding phase A and phase Z and using encoder.position-interpolated > for spindle-revs). I would have the same doubts as you if the G76 and > G33 did not work as expected. I am not really discussing the quality of > threading (which might be better using a higher resolution encoder). My > question was rather why G76 and G33 work fine and G95 not at all. > Karl > > > Am 09.12.2014 um 15:43 schrieb sam sokolik: >> You are using the hal encoder counter? On the beagle bone - are you not >> limited to just a servo thread? 1khz? So you are running all the >> encoder functions in 1 thread. I don't know how that would work very >> well with the hal encoder counter to calculate velocity. >> >> You might want to look at the signal going to motion.spindle-speed-in. >> It might not be what you are expecting. >> >> sam >> >> >> On 12/9/2014 8:23 AM, Karl Jacobs wrote: >>> Thanks for checking, Sam, and good to know. I'll try sim on my version >>> but I doubt it will be different to my "real world" version. I use the >>> same low-passed spindle encoder velocity on spindle-speed-in. I'll try >>> to find the difference between the 2.7 and 2.8 code then (or the >>> difference to the machinekit branch). >>> Karl >>> >>> Am 09.12.2014 um 14:36 schrieb sam sokolik: >>>> I don't have 2.7 here.. But in 2.8(master) lathe sim works as expected. >>>> >>>> This short program >>>> >>>> G95 >>>> s100m3 >>>> g1z4f.001 >>>> g0z0 >>>> m30 >>>> >>>> Z moves to 4" at .1ipm (which seems right 100*.001=.1) >>>> Changing the spindle speed changes the feed. >>>> >>>> Looking at hal in the lathe sim - the motion.spindle-speed-in is hooked >>>> to a low-passed spindle encoder velocity. >>>> >>>> sam >>>> >>>> >>>> >>>> On 12/9/2014 6:38 AM, Karl Jacobs wrote: >>>>> Thanks for the info. If I disconnect spindle-speed-in, G76 and G33 stop >>>>> working too, so they seem to need both signals somehow, but from what >>>>> you say that still does not necessarily mean that G95 must work as well. >>>>> I rather suspect the motion planner. Maybe someone can verify if G95 >>>>> works in the non-machinekit linuxcnc version? I will post to the >>>>> machinekit list as well. >>>>> Am 09.12.2014 um 12:24 schrieb andy pugh: >>>>>> On 9 December 2014 at 08:53, Karl Jacobs <[email protected]> wrote: >>>>>> >>>>>>> I can rule out hardware problems of an encoder by using a hal siggen >>>>>>> component to drive the hal encoder inputs (Phase A and Z, counter mode) >>>>>>> to simulate the spindle speed signal. That must be working correctly >>>>>>> because G76 and G33 both give the right result (my X and Z axis >>>>>>> components drive a real lathe so I can watch and check the motions). >>>>>>> >>>>>> G76 and G33 use motion.spindle-revs, and G95 uses motion.spindle-speed-in >>>>>> So, it is possible to have a fully functional G76 and G33 but not have a >>>>>> working G95. >>>>>> >>>>>> It is possible that this is due to the new motion planner. >>>>>> >>>>>> It is also possible that this is a Machinekit-only problem. Machinekit >>>>>> has >>>>>> now diverged considerably from LinuxCNC, and your query should probably >>>>>> be >>>>>> directed to the Machinekit mailing list. >>>>>> >>>>> ------------------------------------------------------------------------------ >>>>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server >>>>> from Actuate! Instantly Supercharge Your Business Reports and Dashboards >>>>> with Interactivity, Sharing, Native Excel Exports, App Integration & more >>>>> Get technology previously reserved for billion-dollar corporations, FREE >>>>> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk >>>>> _______________________________________________ >>>>> Emc-users mailing list >>>>> [email protected] >>>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>>> >>>>> >>>> ------------------------------------------------------------------------------ >>>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server >>>> from Actuate! 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Instantly Supercharge Your Business Reports and Dashboards >>> with Interactivity, Sharing, Native Excel Exports, App Integration & more >>> Get technology previously reserved for billion-dollar corporations, FREE >>> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk >>> _______________________________________________ >>> Emc-users mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >>> >> >> ------------------------------------------------------------------------------ >> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server >> from Actuate! Instantly Supercharge Your Business Reports and Dashboards >> with Interactivity, Sharing, Native Excel Exports, App Integration & more >> Get technology previously reserved for billion-dollar corporations, FREE >> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! 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