well - can you run sim -> axis -> lathe and test G95. That would tell you if it is a configuration problem vs machinekit.
sam On 12/9/2014 11:18 AM, Karl Jacobs wrote: > 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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