yes, that is understood and it works as expected ( I checked with hal meter). Karl
Am 09.12.2014 um 16:08 schrieb sam sokolik: > 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! 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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! 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