#linuxcnc-devel | Logs for 2014-11-27

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[00:31:11] <seb_kuzminsky> cradek: hey neat, weren't we just talking about a scale like this: http://www.watzlavick.com/robert/rocket/rocket1/photos/dsc_0081m.jpg
[00:32:01] <cradek> I ordered that one from enco with 10ths/100ths of inches on one side and mm/halfmm on the other side
[00:32:06] <cradek> and yay, it's exactly what I always wanted
[00:32:12] <cradek> what is that thing?
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[00:49:46] <jepler> andypugh: I thought we enabled that C99 feature (declaration after statement) everywhere. not true?
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[01:11:58] <kwallace> cradek, in case you had not found this yet : http://www.watzlavick.com/robert/rocket/rocket1/photos/
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[02:13:19] <skunkworks> looks like the lathe powered up...
[02:13:30] <skunkworks> darn/yay
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[02:28:14] <KGB-linuxcnc> 03Dewey Garrett 05dgarr/moveoff bb40998 06linuxcnc 10(7 files in 2 dirs) moveoff.comp: refactor for comp personality use * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=bb40998
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[02:48:47] <KGB-linuxcnc> 03Dewey Garrett 05dgarr/moveoff 11aea19 06linuxcnc 10src/hal/components/moveoff.comp moveoff.comp: print all items when showing Error * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=11aea19
[02:53:43] <KGB-linuxcnc> 03Sebastian Kuzminsky 05seb/2.7/docs-reorg 67c7f5a 06linuxcnc 10(81 files in 9 dirs) docs: reorg Getting Started (English) * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=67c7f5a
[02:53:43] <KGB-linuxcnc> 03Sebastian Kuzminsky 05seb/2.7/docs-reorg dd78510 06linuxcnc 10(77 files in 8 dirs) docs: reorg Getting Started (French) * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=dd78510
[02:53:43] <KGB-linuxcnc> 03Sebastian Kuzminsky 05seb/2.7/docs-reorg c6f77d8 06linuxcnc 10(19 files in 5 dirs) docs: reorg Getting Started (Spanish) * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=c6f77d8
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[04:59:03] <kwallace> skunkworks, I guess you need to find another machine to work on.
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[06:45:49] <seb_kuzminsky> jthornton_: here's what i'm thinking for the Getting Started guide: http://buildbot.linuxcnc.org/doc/scratch/v2.7.0~pre2~seb-2.7-docs-reorg~c6f77d8/html/
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[14:02:39] <jepler> seb_kuzminsky: you might want to change Ubuntu mentions to Debian mentions since that's the OS we're providing current install media for
[14:03:22] <jepler> I think zsync is the preferred download method now
[14:04:07] <jepler> > For configurations that have customized emc.nml, a change similar to this one is required.
[14:04:13] <jepler> probably "this one" used to be a hyperlink
[14:04:27] <jepler> >
[14:04:27] <jepler> Download the firmware images as tar files from http://emergent.unpy.net/01267622561 and install them manually
[14:04:35] <jepler> probably want to point at the right directory on wlo
[14:04:49] <jepler> though .. I dunno what firmware version(s) will work with old linuxcnc like that sooo
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[14:05:31] <jepler> > Do not attempt run LinuxCNC while the latency test is running.
[14:05:34] <jepler> ... or vice-versa
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[16:04:53] <wilstonoreo> hey guys
[16:05:05] <wilstonoreo> i have a question concerning the traj planner
[16:06:01] <wilstonoreo> first if there has anything changed since version 2.6.0
[16:06:36] <wilstonoreo> because in my current setup, the gcode commands g61 and g64 do not seem to have any effect
[16:06:56] <wilstonoreo> i'm using linuxcnc 2.70 together with a mesa 5i25
[16:07:52] <wilstonoreo> when lots of tiny segments are in the gcode, the machine is driving slower (even if the segments are on a straight line)
[16:08:54] <wilstonoreo> which i thought path planner is smart enough to handle
[16:10:45] <archivist> it should in 2.7
[16:10:51] <wilstonoreo> ok
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[16:12:12] <wilstonoreo> so assuming a straight line with several g1 commands is traversed and consists of periods of longer segments and shorter ones (my current test setup).
[16:12:12] <wilstonoreo> In 2.70, the feed rate should be constant then?
[16:12:20] <archivist> the new planner announcement http://comments.gmane.org/gmane.linux.distributions.emc.user/51783
[16:14:01] <archivist> in that thread there is mention of the settings available
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[16:15:00] <pcw_home> The new TP (that is turned on by default) in 2.7 should be considerably faster at gcode with lots of short segments
[16:15:20] <wilstonoreo> ah ok, this arc_blend stuff
[16:15:33] <wilstonoreo> the source is in src/emc/tp/tp.c ?
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[16:16:38] <pcw_home> I would presume so
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[16:17:38] <wilstonoreo> other question, what is advantage of using xenomai instead of rtai?
[16:19:39] <pcw_home> LinuxCNC currently doesn't support Xenomai (Machinekit does)
[16:20:06] <pcw_home> LinuxCNC currently supports Preemt-RT and RTAI
[16:20:25] <wilstonoreo> which one is better?
[16:20:36] <pcw_home> all are better
[16:20:45] <wilstonoreo> Preemt-RT or RTAI?
[16:20:49] <pcw_home> (at different things)
[16:21:31] <wilstonoreo> aha
[16:21:34] <wilstonoreo> why would i use xenomai, for instance
[16:21:55] <pcw_home> latency wise its roughly RTAI, Xenomai, Preemt-RT in order of worsening latency
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[16:23:15] <pcw_home> so for software step generation on a PC RTAI is best
[16:23:35] <wilstonoreo> we do hardware step gen
[16:23:36] <Tom_L> does it really matter so much with your boards?
[16:24:22] <pcw_home> No its not a big issue unless you have software stepgens or you need really high servo thread rates
[16:24:54] <Tom_L> i wish there was a latency chart somewhere that showed levels of good and bad
[16:25:29] <Tom_L> and potentially max soft and hard step rates
[16:25:38] <pcw_home> also Xenomai (and Preemt-RT) have support for current Arm CPUs, RTAI does not
[16:25:48] <wilstonoreo> because 2.70 doesnt work with our boards since i have a xenomai kernel. We used machine kit before, but it doesnt not seem to have the new path planner.
[16:25:48] <wilstonoreo> So basically, i setup a debian with Preemt-RT, check out 2.70 and compile?
[16:25:52] <wilstonoreo> we work on x86
[16:26:12] <pcw_home> MK does have the new TP
[16:26:26] <wilstonoreo> ok, then why it doesnt work with my setup?
[16:26:47] <pcw_home> Not sure if its enabled by default like it is in linuxcnc
[16:26:47] <wilstonoreo> one sec, i take a look at which branch i'm currently
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[16:27:14] <wilstonoreo> on machinekit
[16:28:31] <pcw_home> you may need to set ini.traj_arc_blend_enable = true
[16:28:57] <wilstonoreo> in the hal file?
[16:28:58] <Tom_itx> pcw_home, i got those chips off the boards if i could get with you some time next week... would be appreciated.
[16:29:38] <pcw_home> OK I'll make a bag-o-chips next week to mail to you
[16:29:55] <Tom_itx> lemme know the damages...
[16:30:02] <pcw_home> you can setp it in the hal file
[16:30:37] <wilstonoreo> so i have the arc_blend stuff in my inifile but nothing changed
[16:30:40] <wilstonoreo> s
[16:30:50] <wilstonoreo> do i need to recompile it?
[16:31:16] <pcw_home> Wouldn't think so
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[16:32:23] <wilstonoreo> so when a preemt-rt is sufficient and i only need the new traj planner by default, linuxcnc 2.70 should preferable, shouldnt it?
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[16:34:56] <pcw_home> I guess it depends on what you are doing, is debian iso has both kernels available so you can try both
[16:36:20] <pcw_home> if i run the linuxcnc splash screen (1200 IPM) it runs is ~12 seconds with the CAB off and ~8 seconds with CAB on
[16:36:35] <wilstonoreo> cab?
[16:37:05] <wilstonoreo> i'm running a 3d printer with it
[16:37:22] <pcw_home> Circualar Arc Blending (the new TP)
[16:37:48] <pcw_home> circular
[16:38:28] <wilstonoreo> yeah, i saw it, played with the settings in machine kit, but i guess its not activated
[16:38:54] <wilstonoreo> so then i will test it with good old new linuxcnc 2.7.0
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[16:39:40] <wilstonoreo> will try that, come back to you guys later maybe, thanks a lot for now!
[16:39:43] <pcw_home> and g64 works as usual
[16:40:22] <skunkworks> I pretty sure the new tp is activated by default in linuxcnc (2.7+)
[16:40:53] <Tom_itx> pcw_home, could the 7i43 be powered without U9 to test for connectivity?
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[16:41:29] <wilstonoreo> ok, how can i see (without printing anything) if the new tp is activated?
[16:42:09] <skunkworks> wilstonoreo: are you using the A axis for your extruder?
[16:42:20] <wilstonoreo> yeah exactly
[16:43:23] <wilstonoreo> does the 4th axis affect the trajectory?
[16:43:35] <skunkworks> you won't see any improvement in speed... the new tp only improves XYZ moves... if you add an A movement it falls back to the classic blending
[16:44:24] <wilstonoreo> is there a workaround for this?
[16:44:33] <wilstonoreo> thats pretty odd to be honest
[16:44:41] <skunkworks> switch to velocity extruding - (so it isn't an axis)
[16:45:12] <wilstonoreo> ok, i read about that already... not so easy to set up it seems
[16:49:12] <wilstonoreo> https://github.com/luminize/machinekit/tree/vel-control-extruding
[16:49:12] <pcw_home> Tom_itx: Im not sure the power will be enabled without U9
[16:49:21] <Tom_itx> ok
[16:49:39] <Tom_itx> i was just gonna check the 3.3v reg and see if the pc could see the board
[16:49:56] <Tom_itx> i'll just wait
[16:52:05] <pcw_home> I will send a couple FAN2001s in case they got damaged
[16:52:43] <wilstonoreo> but velocity extrusion doesnt work with two extruders...
[16:53:35] <Tom_itx> i think i'll order a 7i90 7i47 soon just to have as a fallback anyway
[16:53:55] <Tom_itx> do you have those screwterminal power rails on the store page?
[16:54:04] <Tom_itx> i'd like to get one of those too
[16:54:51] <pcw_home> the common block? not sure what the stock situation is on those (we are behind quite a bit)
[16:54:57] <Tom_itx> anything else i'll need for the 7i90?
[16:55:04] <Tom_itx> same d25?
[16:55:26] <Tom_itx> i should get some din rail mounts
[16:55:34] <Tom_itx> do you guys have the rails themselves?
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[16:55:47] <Tom_itx> i don't think i've got enough here
[16:56:37] <Tom_itx> i can check back later on all that
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[16:58:05] <cradek> > Once I removed the oilers and drilled the holes deep enough to reach the bearings I had a way to inject insufficient quantities of the incorrect lubricant.
[16:58:35] <Tom_itx> stuff it with felt?
[16:59:39] <pcw_home> why would velocity extrusion not work with any number of extruders?
[17:00:36] <wilstonoreo> should be possible with a t command shouldn't it?
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[17:52:56] <seb_kuzminsky> jepler: good feedback, thanks
[17:53:18] <seb_kuzminsky> i've not really started fixing up the contents yet, but i noted those items for when i do
[17:53:43] <seb_kuzminsky> so far the thing i've done is reorganized the getting started docs:
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[17:55:48] <seb_kuzminsky> whoops
[17:56:25] <wilstonoreo> so the new trajectory planner works for me, but as you guys only without the 4th axis
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[17:56:55] <wilstonoreo> just wrote a little python script which generates a test gcode with a straight line and different segment sizes
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[17:58:07] <seb_kuzminsky> in 2.7.0~pre2 we had all the sections of the getting-started docs as separate html files, generated from separate asciidoc source files
[17:58:39] <seb_kuzminsky> all the getting-started sections were linked (manually) from the top-level index.html
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[17:59:31] <seb_kuzminsky> that branch moves all the getting-started source files to a new getting-started/ directory, and makes a top-level Getting Started html document from them, with the same contents as the Getting Started pdf
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[18:28:23] <wilstonoreo> so guys, i hacked the traj planner, so it doesnt fallback when abc axes are used
[18:28:26] <wilstonoreo> works nicely
[18:28:35] <wilstonoreo> thx a lot
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[18:44:31] <skunkworks> wilstonoreo: could we see what you did?
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[18:46:59] <wilstonoreo> sure, one sec
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[18:50:11] <wilstonoreo> http://pastebin.com/dHvkq0n1
[18:50:17] <wilstonoreo> quite hacky, i know
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[19:11:30] <wilstonoreo> oh sorry forget, its all in src/emc/tp/tp.c
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[19:28:56] <jthornton> seb_kuzminsky, thanks for organizing the docs
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[20:21:16] <seb_kuzminsky> jthornton: sure thing! it's just the start so far, since there seems to be a general opinion that it's an improvement i'll go ahead and do the same to the other books (user guide, integrator guide, etc)
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[21:06:58] <jthornton> great and don't eat too much today
[21:11:01] <zeeshan|2> do you guys have a good quick reference for someone with some _programming_ experience
[21:11:10] <zeeshan|2> that deals with communication over protocols?
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