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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers > ------------------------------------------------------------------------------ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
