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[00:37:20] <mozmck> If you have an axis with a handwheel and a servo motor, can you make linuxcnc update the position from the encoder when manually moving with the handwheel?
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[00:37:56] <mozmck> (the motor drive would have to be disabled of course)
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[00:39:00] <jepler> yup, already does that
[00:39:20] <jepler> in machine off mode the amp should be disabled but linuxcnc tracks the position
[00:39:26] <mozmck> hmm.
[00:39:35] <jepler> on the off -> on transistion, the commanded position becomes the feedback position
[00:39:46] <jepler> well in all modes including estop linuxcnc tracks position
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[00:40:23] <mozmck> our thc moves the Z independently of Linuxcnc when cutting, and returns control to linuxcnc when not cutting.
[00:41:25] <mozmck> I'm wondering if there is a way to use the step signals coming out of the THC as an encoder to keep linuxcnc updated with the current position?
[00:42:17] <mozmck> This would be with the machine on and running though. Would I get following errors?
[00:44:19] <andypugh> You can arrange not to. Perhaps using “offset”
[00:45:22] <mozmck> I'm not familiar with offset. this is a step and direction drive, so open loop normally.
[00:45:32] <jepler> offset is a hal component
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[00:46:53] <mozmck> thanks, I'll look at that.
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[01:22:39] <skunkworks> http://www.machsupport.com/forum/index.php/topic,30680.0.html
[01:41:37] <Tom_itx> that would be like putting racing fuel into a yugo
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[02:20:13] <jepler> hee hee
http://www.machsupport.com/Mach3Wiki/index.php?title=Rs274ngc.h
[02:24:40] <jepler> (I had gone looking for documentation on making a mach motion plug-in and ran into this)
[02:33:08] <mozmck> I have such documentation if you need it...
[02:34:29] <mozmck> hmm, it is for Mach3, so may not be relevant for Mach4 if that's what you want.
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[05:00:13] <jepler> mozmck: no not really
[05:01:04] <jepler> I have no interest in developing software that works with mach, but some idle curiosity about what documentation is public.
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[12:25:30] <KGB-linuxcnc> 03John Thornton 052.7 725165f 06linuxcnc 10docs/src/Submakefile 10docs/src/common/linux-faq.txt 10docs/src/index.tmpl Docs: fix expand/collapse in html docs. * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=725165f
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[14:36:48] <jepler> huh I had no idea such a function was specified in POSIX: FILE *fmemopen(void *buf, size_t size, const char *mode);
[14:39:37] <skunkworks> is that good?
[14:41:10] <jepler> it lets you treat a region of memory like a file on disk for reading or writing, which is going to be useful sometimes
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[14:41:24] <jepler> dpkg-deb: building package `linux-image-4.1.0-1-rt-686-pae' in `../linux-image-4.1.0-1-rt-686-pae_4.1.3-1.1_i386.deb'.
[14:41:35] <jepler> might have some 32-bit rt packages later today
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[15:09:28] <Tom_itx> skunkworks, do you recall where andy's carousel example code was?
[15:11:25] <pcw_home> Hasn't it been merged into 2.7?
[15:11:47] <Tom_itx> the docs are but i was looking for his example
[15:18:04] <Tom_itx> remotes/origin/andypugh/carousel_demo but how do i view that locally?
[15:36:33] <jepler> 2.7.0-pre7 has this mention in its changelog: * add a carousel toolchanger component and a vismach sample config
[15:36:53] <jepler> so I expect that if you are using a current 2.7 version that you have the config. it's in configs/axis/vismach/
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[15:42:41] <pcw_home> For stepgen feedback, required FF2 seems to be determined entirely by delay between position read and velocity write
[15:42:42] <pcw_home> (tested at 1 KHz and 3 KHz same FF2 value works, I can change delay by adjusting DPLL position sample point )
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[15:51:11] <Tom_itx> jepler, thanks
[15:51:35] <pcw_home> with a read/write time change of 150 usec, FF2 went from .000125 to .000270 (same at 1 KHz and 3 KHz)
[15:52:50] <pcw_home> a rather suggestive number since its almost exactly the FF2 value change in seconds
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[16:13:40] <jepler> indeed
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[16:58:53] <jepler> by implementing rtapi_task_latency() that knows what the nominal task invocation time was, it's possible to get proper one-sided latency histograms.
http://emergent.unpythonic.net/files/sandbox/jepler-15Aug2015-65.png
[16:59:06] <jepler> but I've only implemented it for uspace so far, haven't looked at doing it for rtapi
[17:00:05] <jepler> er for rtai
[17:04:26] <pcw_home> I'm so used to looking at mirrored ones that that looks funny even though its correct
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[17:08:59] <jepler> and dropping the empty left half
http://emergent.unpythonic.net/files/sandbox/jepler-15Aug2015-22.png
[17:09:25] <jepler> .. though there still exists the possibility of a negative latency if clock_nanosleep is permitted to return early
[17:12:57] <jepler> http://emergent.unpythonic.net/files/sandbox/one-sided-latency.patches.mbox
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[18:50:43] <cradek> that's neat
[18:51:06] <cradek> it's cool that you can see the minimum latency too, and it's sure sharp
[18:52:29] <pcw_home> Yeah the minimum gets overwritten on the folded display
[18:58:17] <cradek> very early versions of emc did that wrong thing with the tool table (interpreted lengths and diameter according to g20/g21)
[18:58:44] <cradek> also, it did the same with offsets! g20/g21 were unusable.
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[20:24:40] <jepler> cradek: yes, it's quite sharp
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[21:59:15] <Tom_itx> mmm i'm still not finding the carousel demo
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[22:02:49] <Tom_itx> wonder if apt-get pulled those in...
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[22:10:36] <Tom_itx> ok
[22:10:44] <Tom_itx> wow that was buried deep
[22:12:16] <Tom_itx> usr/share/doc/linuxcnc/examples/sample-configs/sim/axis/vismach/VMC-toolchange
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[22:20:39] <pcw_home> thats where locate can help
[22:20:52] <Tom_itx> i did
[22:20:55] <Tom_itx> :)
[22:21:11] <Tom_itx> now how can i launch the associated ini in that directory?
[22:21:19] <Tom_itx> i tried mapping an icon to it...
[22:21:20] <Tom_itx> no joy
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[22:22:06] <atom1> the ini is vmc_index.ini
[22:22:27] <atom1> in that directory
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[22:30:30] <atom1> i wonder if i need python plugins for this to work
[22:30:53] <atom1> ImportError: no module named stdglue
[22:32:05] <atom1> i do get a cool little graphic before it bombs though
[22:32:49] <atom1> i'll wait for andy
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[22:34:22] <Tom_itx> i did have to move it out of readonly space to a user directory
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[22:37:47] <Tom_itx> emctaskmain.cc 3006 can't initialize interpreter
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