@sam: I ran sim->axis->lathe on my BeagleBone and it does the same thing as the "real" version: no influence of spindle speed to feed rate. Looks like a machinekit/BeagleBone or version 2.7.0 issue. I'll find out eventually.
@Gene: Yes, I did in fact read the G95 part of the manual, and Sam's short code section does just that: give S and F after switching to G95. And I agree with you that the folks on this list are very responsive and hepful. Thanks for that. Karl Am 09.12.2014 um 20:08 schrieb sam sokolik: > 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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