On 06/27/2015 03:35 PM, Sebastian Kuzminsky wrote: > On 06/27/2015 01:44 PM, Jon Elson wrote: >> I'm running a pretty stock 2.5.4 version of LinuxCNC on my >> Bridgeport. The only thing I have changed is to add the >> camera tab to Axis with camview. The motion system is my >> PPMC analog velocity board set. I have lately started >> getting following errors during slow motion. I at first >> suspected a chip in the ballscrew, but then it started >> happening on different axes. I lately have left Halscope >> running, hoping to trap what is going on. Well, I finally >> got it, and it is really strange! >> >> See http://pico-systems.com/images/false_error.png for the >> Halscope trace. >> >> The selected trace is in white, the X axis following error >> (pid.0.error). Trace 4 (purple) is amp-enable, and triggers >> the capture on the falling edge. You can see the X >> following error is quite small, and actually decreasing. It >> is well below the following error threshold in the ini >> file. I did get the "following error on axis 0" message on >> the Axis screen. This can happen several times during a >> machining session, seemingly at random. > What are your [AXIS_*]FERROR and MIN_FERROR values? FERROR = 0.003 MIN_FERROR = 0.005
So, the recent error before the following error tripped was about 50 times smaller than the MIN_FERROR limit! > Was the machine slowing down when the X axis f-errored, or was it moving > at a constant slow speed? That doesn't seem to matter, but probably at a constant speed most of the time. It has happened 5 more times today, I have more Halscope shots, but they don't really give additional information. Jon ------------------------------------------------------------------------------ Monitor 25 network devices or servers for free with OpManager! OpManager is web-based network management software that monitors network devices and physical & virtual servers, alerts via email & sms for fault. Monitor 25 devices for free with no restriction. Download now http://ad.doubleclick.net/ddm/clk/292181274;119417398;o _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
