#linuxcnc-devel | Logs for 2016-01-27

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[03:29:52] <jepler> huh I don't know what was wrong with the forum, but doing a "clear cache" in the admin interface fixed it
[03:30:04] <jepler> there were lots of log errors like
[03:30:04] <jepler> [Mon Jan 25 13:57:58.547767 2016] [:error] [pid 7404] [client 79.161.33.46:59743] PHP Notice: unserialize(): Error at offset 2965692 of 2970227 bytes in /var/www/html/libraries/joomla/cache/controller.php on line 203, referer: https://www.google.no
[03:30:14] <jepler> and later
[03:30:15] <jepler> [Mon Jan 25 18:20:45.685455 2016] [:error] [pid 11965] [client 207.46.13.27:39366] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 11457906 bytes) in /var/www/html/libraries/joomla/cache/storage/file.php on line 140
[03:30:21] <jepler> so I made a guess..
[03:35:49] <jepler> http://forum.joomla.org/viewtopic.php?f=706&t=888690
[03:35:53] <jepler> no clues from the joomla forum...
[03:36:47] <jepler> you can also find lots of sites with the same problem https://www.google.com/search?q=%22joomla%2Fcache%2Fcontroller.php+on+line+203%22
[03:36:54] <jepler> bonus: local paths are exposed
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[03:59:27] <strokercrate> hiya
[04:00:50] <seb_kuzminsky> oi
[04:01:51] <strokercrate> Hows it going?
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[04:09:44] <strokercrate> I have a question in regards to slave axis homing and logic ladder and if what I have an Idea with is possible.
[04:11:43] <seb_kuzminsky> ok
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[04:14:56] <strokercrate> Basically I was wondering if you could build a ladder that would allow the system to home on a slave by triggering the step signal to be killed on the slave motor once the first limit is tripped for a set amount of time. Then it reinitializes the slave with a timer and shuts the main drive off and triggers another home for the slaved axis only allowing the slave to auto square? and once done reinitializing the whole ax
[04:14:56] <strokercrate> is that has a slave?
[04:15:54] <seb_kuzminsky> a general scheme like that could probably be made to work
[04:16:13] <seb_kuzminsky> but i wouldn't use ladder for the first attempt personally
[04:16:53] <strokercrate> I tried gantrykins, But for some reason I could not ever get a good rapid without a following error
[04:17:15] <seb_kuzminsky> i doubt that's gantrykins' fault
[04:17:25] <strokercrate> I eventually made the slave a manual home. So i was contemplating this route
[04:17:30] <seb_kuzminsky> gantrykins has some problems, but ferror at rapid isnt one of them afaik
[04:17:47] <seb_kuzminsky> some of us have been batting around an idea similar to yours
[04:18:27] <seb_kuzminsky> whereby you would mark the two gantry joints as being part of a group, and they would proceed through the homing state machine in a kind of lock-step
[04:18:33] <strokercrate> I could only rapid it at about 120ipm.. But without gantrykins with a slave tied to Y through another output pin I can get 500ipm
[04:18:35] <seb_kuzminsky> like you suggested above
[04:19:23] <strokercrate> Yes, WinCNC does something similar to what im contemplating. I was unaware others have been working on it in a similar way.
[04:19:45] <seb_kuzminsky> it's mostly a gleam in cradek's eye at the moment
[04:20:07] <seb_kuzminsky> the work-in-progress is in the synchronized-homing branch, here: https://github.com/LinuxCNC/linuxcnc/commits/synchronized-homing
[04:21:24] <strokercrate> I wonder why this is difficult in LinuxCNC, But Mach, UCCNC and WinCNC have no problem? Is it because of the linux rtai system?
[04:22:03] <seb_kuzminsky> do you mean why it's difficult to set up an auto-squaring gantry in linuxcnc?
[04:22:43] <seb_kuzminsky> the answer to that is that lots of people run gantry machines (including me), but no one has written the code to do auto-squaring yet
[04:23:25] <seb_kuzminsky> i carefully located my two home switches so that they trip when the gantry is square, then home the two gantry joints together
[04:24:06] <seb_kuzminsky> it accomplishes the same result, but without the nice feature that you and cradek have thought about, where the gantry becomes more square gradually throughout the homing process
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[04:24:53] <strokercrate> So basically you are using switches to dead stop a drive?
[04:26:23] <strokercrate> Oh I see what you are doing now, nevermind.
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[04:34:55] <seb_kuzminsky> just regular home switches
[04:35:07] <mozmck> strokercrate: there is a component called gantry.comp that will work...
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[04:36:09] <mozmck> I've just been working on this stuff, and I am using that for now, because it was going to take too long to get synchronized homing AND joint-axes working for me.
[04:36:35] <strokercrate> I don't think I noticed that in my research.
[04:37:00] <mozmck> but gantry.comp is not in linuxcnc repositories that I'm aware of - I lifted it from machinekit ;-)
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[04:37:36] <mozmck> I'll have to find some links.
[04:37:49] <strokercrate> ahh, I have yet to toy with machinekit, Have debated about it with a beaglebone.
[04:38:37] <mozmck> I haven't used it, and I sure wouldn't try it on a plasma table like I'm working with!
[04:40:11] <strokercrate> Just built a plasma using WinCNC, but dang it cost to much.
[04:41:06] <mozmck> gantry.comp has the limitation that when a switch trips it stops that joint immediately (no decel). I looked at it at some length and determined that there is no good way to add decel. But, in practice you can set your homing speed at a decent rate unless your motors are really wimpy.
[04:41:44] <mozmck> I've never used WinCNC.
[04:42:56] <strokercrate> Its a decent system, and the guys that run it are awesome. But the cost, well its heavy at times. I personally love linuxcnc more then the others I have used thus far.
[04:43:06] <mozmck> I think that a sychronized homing is really the way to go. The hal component is a stop-gap measure.
[04:44:19] <strokercrate> Well, a direct stop atm would be a great benefit, even if its a few thousands off in square, most router applications thats not a problem
[04:45:00] <seb_kuzminsky> mozmck: does the output of gantry.comp become the command to a stepgen?
[04:45:16] <seb_kuzminsky> if so you could run it through limit3 to get decel
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[04:46:51] <mozmck> limit3? I guess I should look at that. Yes, although I'm using pcw's PID stuff and the stepgen gets the velocity output of the pid
[04:47:08] <strokercrate> I would love to toy with this.
[04:48:15] <seb_kuzminsky> mozmck: i should connect you with Brian Hicks, who contacted me recently about a hy-vfd bug that he had fixed
[04:48:18] <seb_kuzminsky> he was looking at gantry.comp too
[04:49:35] <mozmck> interesting. I worked on it for a while. There is also a version called gantry_latching that is supposed to work better for the homing method I use where it moves off the switch.
[04:50:31] <mozmck> But I could never get that one to work - it would trip all switches and then have a following error. The standard one works well enough though.
[04:51:49] <strokercrate> Do you remember where the info is located, not really finding references in a search
[04:52:01] <mozmck> Let me look again - hold on...
[04:53:24] <strokercrate> think I just found it. lgantry.icomp?
[04:53:52] <mozmck> no - the icomp is a new machinekit thing. It is mostly the same...
[04:56:00] <strokercrate> oh, okay
[04:57:25] <seb_kuzminsky> https://sourceforge.net/p/emc/mailman/message/32654660/
[05:02:21] <strokercrate> The link within to the github turns a 404, a manual search through components shows its not there.
[05:03:05] <seb_kuzminsky> this was the final version of gantry.comp before it became an icomp: https://github.com/machinekit/machinekit/blob/0e1acad530651837e0c13c704850c69cf2c2acef/src/hal/components/gantry.comp
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[05:04:35] <seb_kuzminsky> looks like charles steinkuehler was the only person to commit to it, which agrees with the copyright at the top of the file
[05:04:53] <strokercrate> Awesome Thanks, this gives me something to toy with
[05:05:14] <seb_kuzminsky> let us know what you find out!
[05:05:54] <mozmck> thanks seb - I can look up more stuff tomorrow.
[05:07:32] <strokercrate> Sure will, retrofitting an old camtech now for UCCNC, but will be able to accept Linux as well, so I may use it for Experimentation
[05:08:10] <strokercrate> Anyone ever use UCCNC?
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[12:51:06] <jepler> JT-Shop: I notice the forum never got announcements for 2.7.3 and 2.6.12. pinging you since you usually take care of it.
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[13:33:05] <skunkworks> archivist, http://bbs.homeshopmachinist.net/threads/69393-Electronic-threading-latest-and-greatest?p=1027783#post1027783
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[14:05:55] <JT-Shop> jepler: thanks for the reminder
[14:21:55] <skunkworks> http://www.cnczone.com/forums/benchtop-machines/297554-mach-3-conversion-kit-boxford-vmc-190-a.html#post1826168
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[14:27:45] <archivist> skunkworks, guess who has to got across and wire it and edit the hal file :)
[14:27:52] <archivist> got/go
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[14:31:00] <archivist> skunkworks, did a boxford for somebody, you can lift the connector from the control and connect a bob to it
[14:31:45] <archivist> it has some ST drives that work ok
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[15:03:40] <mozmck> Can axes A, B, or C be set to LINEAR? In Gscreen it seems to assume they are always ANGULAR
[15:04:06] <jepler> mozmck: no, I don't think so
[15:04:31] <jepler> you mean so that e.g., G20/G21 affects how the A-number is interpreted? I don't think that is possible.
[15:05:26] <mozmck> Hmm, so what is the AXIS_X[TYPE] setting for in the ini file?
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[15:12:33] <mozmck> Is G20/G21 handling the only difference between linear and angular I wonder?
[15:13:06] <jepler> the GUIs also have code to multiply/divide values before display differently depending on axis letters
[15:13:20] <jepler> wrapped rotary mode only applies to certain axis letters
[15:13:39] <jepler> there are no codes to select the ABC "plane" for canned cycles or arcs
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[15:14:05] <jepler> ABC motions are probably treated differently than other motions by our current planner
[15:14:18] <mozmck> Yes, the GUI code is what got me asking :-) I figured out that a, b, and c are not being converted when I switch from inch to metric and back.
[15:14:29] <jepler> naive cam also wouldn't operate on ABC
[15:14:55] <mozmck> I see, so a number of differences.
[15:14:58] <jepler> AXIS/gremlin, for the purposes of visualization assumes ABC are always rotations
[15:15:15] <jepler> yeah I'm afraid so
[15:15:46] <mozmck> ok, well thanks for the education.
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[15:37:15] <skunkworks> archivist, does he like how the hobber works?
[15:38:04] <archivist> yes hence after his breakdown he want to continue with linuxcnc
[15:38:22] <skunkworks> break down?
[15:38:41] <archivist> the one we set up end 2014
[15:38:58] <jepler> hardware breakdown, not personal breakdown?
[15:39:08] <archivist> hardware
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[16:32:33] <JT-Shop> is there a list of the config options for the 7i92 anywhere?
[16:34:41] <pcw_home> basically any 5I25 config can be ported (but I haven't done many yet)
[16:37:09] <JT-Shop> I mean like num_encoders
[16:37:33] <jepler> those are in common with all hostmot2 drivers, documented in the main "man hostmot2" page
[16:37:41] <JT-Shop> I have the 7i92 working on a pc in the beer cave
[16:38:00] <JT-Shop> ok, I looked in the hm2_eth page
[16:38:40] <JT-Shop> thanks
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[16:49:58] <pcw_home> Yeah other than the driver needing an IP address, and card name , a 7I92 and 5I25 HAL file should be identical
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[17:22:49] <JT-Shop> ok thanks
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[20:55:51] <micges> zlog: hi
[20:55:51] <zlog> micges: Log stored at http://tom-itx.no-ip.biz:81/~tom-itx/irc/logs/%23linuxcnc-devel/2016-01-27.html
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[21:58:29] <jepler> > DeepMindā€™s program AlphaGo beat Fan Hui, the European Go champion, five times out of five in tournament conditions, the firm reveals in research published in Nature on 27 January1
[21:59:14] <cradek> oh my
[21:59:23] <jepler> http://www.nature.com/news/google-ai-algorithm-masters-ancient-game-of-go-1.19234
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[22:08:16] <jepler> Fan Hui is rated either 2-dan or 8-dan depending what source you check. Big difference. http://senseis.xmp.net/?FanHui http://www.europeangodatabase.eu/EGD/Player_Card.php?&key=12633346
[22:08:39] <jepler> I'm inclined to give EGD, which rates him 8d, the higher credence vs a wiki where the text hasn't been updated
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