#linuxcnc-devel | Logs for 2016-07-15

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[00:41:59] <skunkworks> heh - 32 bit os won't mount an 18tb volume
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[01:31:42] <KGB-linuxcnc> 03Jeff Epler 05master ed79921 06linuxcnc 03scripts/halcmd_twopass.in 10src/Makefile 10src/configure.in halcmd: add "twopass" version as executable script * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=ed79921
[01:31:42] <KGB-linuxcnc> 03Jeff Epler 05master 29d5c45 06linuxcnc 10scripts/halrun.in halrun: If an inifile is specified, run it as twopass * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=29d5c45
[01:31:42] <KGB-linuxcnc> 03Jeff Epler 05master 37e6fc4 06linuxcnc 10(5 files) testsuite: basic test of twopass * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=37e6fc4
[01:44:30] <KGB-linuxcnc> 03Jeff Epler 05jepler/master/ickalb-tp-personalities 6f15b79 06linuxcnc 10tcl/twopass.tcl Merge remote-tracking branch 'gh-ickalb/2.6-tp_personalities' * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=6f15b79
[01:44:30] <KGB-linuxcnc> 03Jeff Epler 05jepler/master/ickalb-tp-personalities 8047337 06linuxcnc 10(5 files) halcmd_twopass: add a basic test of the functionality * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=8047337
[01:47:42] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15jepler commented on issue #91: @ikcalB I have pushed a branch to git.linuxcnc.org that merges this commit to master and then adds a small test of the new functionality. this is branch LinuxCNC:jepler/master/ickalb-tp-personalities which should appear here on github shortly.... 02https://github.com/LinuxCNC/linuxcnc/pull/91#issuecomment-232840171
[01:48:27] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15jepler commented on issue #108: See #110 for news about this work. 02https://github.com/LinuxCNC/linuxcnc/pull/108#issuecomment-232840269
[01:50:10] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15jepler commented on issue #93: @ikcalB when I run halshow, what should I look for to see how this patch changes things? do I need to create particular signal names to see a difference? 02https://github.com/LinuxCNC/linuxcnc/pull/93#issuecomment-232840451
[01:51:20] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15jepler closed issue #96: Task Abort loop on joint soft limit 02https://github.com/LinuxCNC/linuxcnc/issues/96
[01:52:10] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15jepler commented on issue #76: @SebKuzminsky is your work on this in master branch enough to make you feel this issue can be closed? 02https://github.com/LinuxCNC/linuxcnc/issues/76#issuecomment-232840679
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[02:23:06] <jepler> hey this sounds like it could be the pthread_cancel problem! http://article.gmane.org/gmane.linux.rt.user/15564 and renewed thread at http://article.gmane.org/gmane.linux.kernel/2234779
[02:23:55] <jepler> reportedly, a pinned RT process introduces a large latency when it exits
[02:24:23] <jepler> .. large enough to cause a rcu error or a complete hang? ... maybe ?
[02:25:06] <jepler> not sure why it would be different when the whole process is exiting together, instead of just one one thread, though..
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[03:11:10] <seb_kuzminsky> jepler: that seems an unbelievably long time for thread exit
[03:27:01] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky reopened issue #96: Task Abort loop on joint soft limit 02https://github.com/LinuxCNC/linuxcnc/issues/96
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[03:28:48] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky commented on issue #96: I dont think d118ec4 is right. Motion *should* abort on soft limit violation, but it no longer does:... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232851440
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[04:04:02] <KGB-linuxcnc> 03Sebastian Kuzminsky 05issue-96 e2f1c46 06linuxcnc 10src/emc/motion/control.c 10src/emc/nml_intf/emc_nml.hh 10src/emc/task/emctaskmain.cc 10src/emc/task/taskintf.cc Revert "emctaskmain.cc handle on_soft_limit #96 JA" * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=e2f1c46
[04:04:02] <KGB-linuxcnc> 03Sebastian Kuzminsky 05issue-96 e714101 06linuxcnc 10src/emc/usr_intf/axis/scripts/axis.py axis gui: don't set teleop mode in ensure_mdi() * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=e714101
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[04:29:59] <linuxcnc-build> build #497 of 4017.5.deb-wheezy-armhf is complete: Failure [4failed shell_2] Build details are at http://buildbot.linuxcnc.org/buildbot/builders/4017.5.deb-wheezy-armhf/builds/497 blamelist: Florian Kerle <flo.kerle@gmx.at>, Jeff Epler <jepler@unpythonic.net>
[04:43:22] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky commented on issue #96: Part of the problem of this issue is that Axis switches to Teleop mode at a time when Motion is on a Joint soft limit. This causes the never-ending NML-issue-storm in Task. Inhibiting the switch to Teleop avoids the issue-storm.... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232858552
[04:51:10] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky commented on issue #76: No, i only did the fun easy part. I still have to do the tedious bits:... 02https://github.com/LinuxCNC/linuxcnc/issues/76#issuecomment-232859241
[04:51:45] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky commented on issue #76: No, i only did the fun easy part. I still have to do the tedious bits:... 02https://github.com/LinuxCNC/linuxcnc/issues/76#issuecomment-232859241
[04:56:48] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky commented on issue #91: @ikcalB Is the lack of this functionality in 2.6 a problem for you or anyone you know of? 02https://github.com/LinuxCNC/linuxcnc/pull/91#issuecomment-232859732
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[11:01:39] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15pkmcnc commented on issue #96: For identity-kins machines it's possible to avoid this situation completely. I see two options: ... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232923145
[11:02:08] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15pkmcnc commented on issue #96: For identity-kins machines it's possible to avoid this situation completely. I see two options: ... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232923145
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[11:10:22] <KGB-linuxcnc> 03John Thornton 052.7 aee5df1 06linuxcnc 10docs/src/getting-started/updating-linuxcnc.txt Docs: add info about updating * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=aee5df1
[11:10:37] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15pkmcnc commented on issue #96: For identity-kins machines it's possible to avoid this situation completely. I see two options: ... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232923145
[11:35:13] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15pkmcnc commented on issue #96: For identity-kins machines it's possible to avoid this situation completely. I see two options: ... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232923145
[11:40:12] <jepler> well last night I found several variations of "make threads exit at shutdown" but that was by *not* using pthread_cancel, but by simply using a cancel flag that is checked at the place pthread_testcancel is now
[11:41:05] <jepler> so I should probably make that change (pthread_testcancel -> if(task->cancel) pthread_exit(nullptr), and similar in Posix::task_delete)
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[11:47:39] <jepler> hm debian has a security update for php today, but none in the ubuntu that runs the forum yet .. unless they got theirs out a week ago, the last time I updated it?
[11:49:19] <jepler> .. nope
[11:49:25] <jepler> well now I'll just worry
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[14:09:33] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky commented on issue #96: The idea of ignoring joint limits on id-kins machines feels strange after everyone worked so hard on the JA branch to create them, but maybe doing so simplifies things for (most) users. ... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232960557
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[15:25:05] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15pkmcnc commented on issue #96: Oh, the validation is pretty simple, and it can be skipped for inihal changes as long as the machine behaves more or less normally when the limits break.... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232983228
[15:27:40] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15pkmcnc commented on issue #96: Oh, the validation is pretty simple, and it can be skipped for inihal changes as long as the machine behaves more or less normally when the limits break.... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232983228
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[16:11:17] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky opened issue #111: Teach Interp to reject arcs that reach outside the axis soft limits 02https://github.com/LinuxCNC/linuxcnc/issues/111
[16:12:39] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15jepler commented on issue #111: I think this is a duplicate of #80. Close if you agree. 02https://github.com/LinuxCNC/linuxcnc/issues/111#issuecomment-232996414
[16:12:48] <cradek> > The extents of the arc are easy to determine
[16:12:51] <cradek> [citation needed]
[16:25:25] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky commented on issue #96: How's this sound for a design:... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-232999620
[16:27:06] <seb_kuzminsky> cradek: am i missing something there? arc-center +/- radius, or arc endpoints if that's less restrictive
[16:27:28] <seb_kuzminsky> err, modulo P
[16:27:51] <archivist> the rotation
[16:28:22] <cradek> how do you know which of the 4 +- directions to check?
[16:28:32] <seb_kuzminsky> archivist: right, coordinate system rotation affects all this
[16:29:06] <seb_kuzminsky> cradek: i think i'd want to determine the bounding box of the arc, and make sure *it* fits in the axis soft limits
[16:29:18] <seb_kuzminsky> since we have cuboid soft limits that should do it
[16:29:26] <cradek> no, that will throw out a lot of perfectly fine arcs
[16:29:37] <archivist> and bums like me that hang a rotary off to the side and spin it for large arcs :)
[16:29:38] <cradek> any cam software generates huge-radius arcs that look kinda like straight lines
[16:29:54] <cradek> you would disallow all of those
[16:30:12] <seb_kuzminsky> but the endpoints of those huge arcs make the bounding box small, and make it fit inside the soft limits
[16:30:30] <cradek> ok I guess I don't know what you mean by bounding box
[16:30:59] <cradek> (I thought you meant center +- radius along both axes)
[16:31:02] <seb_kuzminsky> the box that contains the programmed arc, including considering the start & end points
[16:31:07] <seb_kuzminsky> like in this picture: http://stackoverflow.com/questions/32365479/formula-to-calculate-bounding-coordinates-of-an-arc-in-space
[16:31:20] <cradek> ok sure! but that'll be hard.
[16:31:35] <seb_kuzminsky> hmm
[16:32:16] <cradek> I agree that's the right solution! I disagree it's easy.
[16:32:31] <seb_kuzminsky> you've thought much more about this than i, so i believe you that there are difficulties i'm neglecting
[16:32:37] <cradek> please prove me wrong and I will try to break it for you
[16:32:37] <seb_kuzminsky> i'll ponder while getting a coffee
[16:34:01] <cradek> I should look at the arc representation at that level and then get coffee too
[16:37:14] <cradek> //FIXME: there was limit checking tests below, see if they were needed
[16:37:16] <cradek> umm
[16:37:20] <cradek> so ... we removed all that?
[16:38:28] <cradek> looking at checkInterpList()
[16:40:58] <jepler> if so I bet it was before any of "us" were here
[16:41:05] <jepler> but who knows!
[16:43:44] <cradek> the turn tells you which way to walk around the quadrants and consider them. you have initial and final directions (just rotate the radial vectors). maybe it's not so hard.
[16:44:18] <cradek> once you've found that you've considered 4, you can go ahead and stop
[16:44:38] <jepler> getting the right axis-aligned quadrants under rotation seems like the main trick then?
[16:45:00] <cradek> you have to check the perpendicular direction too, which it also never did
[16:45:20] <jepler> did you find this old and now-deleted implementation, or are you brainstorming a fresh implementation?
[16:45:31] <cradek> yeah I think the hard part is finding which quadrants to consider
[16:45:43] <cradek> fresh
[16:45:55] <cradek> the old one didn't do much
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[16:46:54] <cradek> it's nice that you have final arc representation at this stage, not r/ijk
[17:00:10] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky closed issue #111: Teach Interp to reject arcs that reach outside the axis soft limits 02https://github.com/LinuxCNC/linuxcnc/issues/111
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[17:00:34] <seb_kuzminsky> thanks for pointing out #80 jepler
[17:01:55] <seb_kuzminsky> http://mathoverflow.net/questions/93659/find-the-bounding-box-of-a-circle-segment/93934#93934
[17:02:39] <seb_kuzminsky> all soft limit checks have to happen in G53, right? so by this time we've undone any coordinate system translation & rotation
[17:02:43] <jepler> side(?) question: if we decided to implement cylindrical work volumes (which is probably a dandy idea) this gets harder again doesn't it
[17:03:41] <seb_kuzminsky> it certainly changes
[17:03:45] <cradek> seb_kuzminsky: at this level you don't have to worry about any of that. in fact maybe rotation is already taken care of?
[17:03:55] <seb_kuzminsky> cradek: i think it must be
[17:04:07] <seb_kuzminsky> jepler: why is cylindrical work volumes desirable?
[17:04:12] <seb_kuzminsky> *are
[17:04:30] <cradek> robots are more cylindrical than rectangular
[17:04:36] <jepler> seb_kuzminsky: it was mentioned on another of these issues. they certainly describe the work volume of a linear delta, and may be more appropriate for hexapods too
[17:05:03] <jepler> no code's written afaik
[17:05:04] <cradek> well describe more closely a linear delta anyway
[17:05:19] <seb_kuzminsky> i can see an argument for trying to supporting different-shaped work volumes for different kins, maybe that's what we're talking about?
[17:06:13] <seb_kuzminsky> maybe the kins would supply a plugin to Interp as well as to Motion, and the interp part would do axis (and joint?) soft-limit violation detection?
[17:06:19] <cradek> hm if you have a kins api for "check this point for me" you won't really know what points to check
[17:06:38] <seb_kuzminsky> yeah, it would have to be "check this Line or this Arc"
[17:06:43] <seb_kuzminsky> all the motion primitives
[17:06:49] <cradek> bleh
[17:06:57] <seb_kuzminsky> and Task could use it for jogs
[17:09:19] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky commented on issue #80: Some hand-wavy discussion here: http://tom-itx.no-ip.biz:81/~tom-itx/irc/logs/%23linuxcnc-devel/2016-07-15.html#11:39:49 02https://github.com/LinuxCNC/linuxcnc/issues/80#issuecomment-233010338
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[18:15:03] <seb_kuzminsky> cradek: is this the lathe you have? https://forum.linuxcnc.org/forum/54-user-exchange/31264-hardinge-chnc-super-precision-lathe-for-sale#77517
[18:21:50] <kwallace1> That looks similar to my HNC: http://www.wallacecompany.com/cnc_lathe/HNC/00003-1a.jpg
[18:23:20] <seb_kuzminsky> kwallace1: do you like yours?
[18:23:45] <cradek> pretty similar, but later than mine
[18:23:57] <cradek> HNC was an NC lathe, CHNC is CNC
[18:25:46] <kwallace1> I like mine, but it doesn't get used very much.
[18:26:23] <cradek> same
[18:26:34] <kwallace1> I'm not too keen on the threaded spindle.
[18:26:46] <cradek> it's a good chucker, no tailstock, most useful for making short <= 1" diameter parts
[18:31:41] <kwallace1> My Feeler gets used more (on the right background): http://www.wallacecompany.com/cnc_lathe/00006-1a.jpg
[18:33:40] <kwallace1> My HNC to LinuxCNC conversion was pretty easy. Maybe easier with reusing the resolvers.
[18:34:57] <seb_kuzminsky> no tailstock seems like a bummer
[18:37:55] <kwallace1> I use the tailstock on the Feeler mostly for drilling which is handled on the turret on the HNC.
[18:38:45] <cradek> the resolvers are really nice, amazing resolution
[18:39:09] <cradek> yes I agree about drilling. it's good at that.
[18:40:32] <cradek> it really is for making lots of small precise parts
[18:40:52] <cradek> it's not a general purpose lathe
[18:41:44] <kwallace1> I haven't worked out having multiple tools at each "pocket" yet, though I may have put it off long enough to have someone else fix it.
[18:42:21] <cradek> mine's modulo so T1 and T9 are at the same turret position (but have different offsets of course)
[18:42:53] <seb_kuzminsky> a friend has an emco 120, i have tool envy
[18:43:20] DeltaF is now known as jbr
[18:45:19] <cradek> seb_kuzminsky: my HNC was super easy to run on single phase power. the main transformer that runs the servo amps was already single phase.
[18:48:57] <kwallace1> How common is CAN Bus on CNCs? I am biased toward Modbus but I have been playing with CAN Bus on a Jaguar and I may get sucked into playing with it more.
[18:49:23] <cradek> don't know, I think of that as a thing that's just in cars
[18:52:38] <jepler> Xenomai comes with some canbus hardware drivers for whatever that's worth
[18:52:59] <kwallace1> The CAN topic seems to come up now and again, maybe more on Machinekit. Hmm: http://www.osadl.org/Abstract-6-RTAI-in-CAN-bus-based-Networ.rtlws11-abstract6.0.html?&no_cache=1
[18:57:04] <jepler> the answer is the same as always: if you want a hardware interface that isn't there yet, you get to do your own research and write your own driver
[18:57:11] <jepler> and if you're not tooooo tiiiirrrreeeeeddddd after that, then make us a PR
[19:04:15] <jepler> a canbus packet is a maximum of 8 bytes, and a packet of that size takes 108 bit times (11-bit address) or 128 bit times (29-bit address). canbus operates at a mere 1Mbit/second. You should probably spend no more than 300us out of a 1ms servo thread waiting on I/O, so you only get 300 bit-times or less than 24 bytes transfer per ms
[19:04:29] <jepler> I don't think it's an appropriate choice for position control (encoders, steppers, etc)
[19:06:30] <jepler> so that leaves stuff you might do in non-realtime and then the constraints on what APIs you can use to talk to hardware become a lot more relaxed: anything you can install on linux.
[19:12:06] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15pkmcnc commented on issue #96: Sounds pretty good.... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-233044700
[19:12:56] <kwallace1> It looks there are four bus types on page 15 here: file:///home/kwallace/Downloads/2003%20MY%20S-Type%20Electrical%20Guide.pdf maybe I should take up knitting instead.
[19:13:41] <kwallace1> Oops. bad link
[19:15:49] <kwallace1> http://www.jagrepair.com/images/Electrical/STypeElectrical/2003%20MY%20S-Type%20Electrical%20Guide.pdf
[19:28:12] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15pkmcnc commented on issue #96: Sounds pretty good.... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-233044700
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[19:43:56] <jepler> who is "pkmcnc", do I know them by another name?
[19:44:19] <skunkworks> I just know him from the youtube videos..
[19:44:50] <jepler> oh yes I've seen some of those videos
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[20:19:32] <seb_kuzminsky> jepler: i think pkmcnc is Andrew Kyrychenko <amkyrychenko@gmail.com>, he's got several commits in master, mostly related to hexapods
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[20:34:18] <jepler> seb_kuzminsky: ah thanks
[20:50:51] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15SebKuzminsky commented on issue #96: I think non-cuboid axis soft limits are an interesting idea, but outside the scope of this particular issue.... 02https://github.com/LinuxCNC/linuxcnc/issues/96#issuecomment-233066468
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[22:53:00] <seb_kuzminsky> yay weekend
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[23:02:41] <JT-Shop> you looking at the chnc?
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[23:08:36] <seb_kuzminsky> haven't heard back from the seller yet
[23:08:51] <seb_kuzminsky> i'll go at least look at it this weekend if he's up for it
[23:09:06] <seb_kuzminsky> not sure the weight is worth the work volume, if you know what i mean
[23:11:17] <JT-Shop> what is the X and Z on that one?
[23:11:24] <JT-Shop> I have a CHNC I
[23:12:27] <JT-Shop> the CHNC I has a 16C spindle... might ask what that one is
[23:12:54] <JT-Shop> Doesn't cradek have a HNC?
[23:18:18] <JT-Shop> time to retire for the night
[23:18:25] <seb_kuzminsky> yeah, he says it works well and was easy to convert
[23:18:34] <seb_kuzminsky> ok see you later :-)
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