#linuxcnc-devel | Logs for 2015-05-01

[08:02:27] <jepler> bash -c 'vim ; :' works fine to suspend with ctrl-g
[09:41:11] <KGB-linuxcnc> 03Jeff Epler 052.7 db29c49 06linuxcnc 10src/hal/utils/halcompile.g halcompile: fix parsing of >> and << * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=db29c49
[09:41:31] <KGB-linuxcnc> 03Jeff Epler 05jepler/halrun-suspend 8c8ad1f 06linuxcnc 10src/hal/utils/halcompile.g halcompile: fix parsing of >> and << * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=8c8ad1f
[09:41:32] <KGB-linuxcnc> 03Jeff Epler 05jepler/halrun-suspend fa16079 06linuxcnc 10src/configure.in configure: provide full path to realtime script * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=fa16079
[09:41:32] <KGB-linuxcnc> 03Jeff Epler 05jepler/halrun-suspend ed98ad5 06linuxcnc 10src/hal/utils/halcmd.c 10src/hal/utils/halcmd.h 10src/hal/utils/halcmd_main.c halcmd: teach halcmd how to clean up a realtime session * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=ed98ad5
[09:41:34] <KGB-linuxcnc> 03Jeff Epler 05jepler/halrun-suspend 31cdfe8 06linuxcnc 10scripts/haltcl.in 10src/hal/utils/halsh.c haltcl: teach haltcl how to clean up a realtime session * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=31cdfe8
[09:41:38] <KGB-linuxcnc> 03Jeff Epler 05jepler/halrun-suspend a68a5a3 06linuxcnc 10scripts/halrun.in halrun: depend on halcmd/haltcl to clean up realtime * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=a68a5a3
[09:42:13] <jepler> I'd love anyone's review or testing of jepler/halrun-suspend which is based on 2.7 branch
[09:44:31] <jepler> I sure don't understand all this terminal terribleness and I'm also sad that libreadline isn't successfully isolating us from it
[10:15:27] <pcw_home> This calculation in dpll.c seems broken unless its a DPLL hardware error of some kind:
[10:15:28] <pcw_home> *pins->phase_error = (rtapi_s32)*hm2->dpll.hm2_dpll_sync_reg
[10:15:30] <pcw_home> * (period / 4294967296000.00) ;
[10:20:11] <pcw_home> (the hal pin should always average to 0 but does not with some servo thread periods)
[11:26:09] <Roguish> hey all. I see a new version of bit hm2 files for Mesa cards, including the venerable 5i20. what was changed?
[11:31:08] <seb_kuzminsky> Roguish: packaging fixes, no changes to the firmware itself
[11:31:42] <jepler> Roguish: in /usr/share/doc/<package name> there will be at least one changelog file. it is supposed to detail the changes in each release.
[11:32:01] <jepler> Roguish: this is true for debian packages and we try to keep them accurate in all the packages we build for debian and ubuntu systems
[11:32:10] <Roguish> ah, ok. that's cool. I was just going thru the git commits.
[11:32:21] <jepler> (at one point they were talking about getting rid of them by default in ubuntu to save disk space, not sure where that went)
[11:32:36] <Roguish> jepler: even better. great. thanks.
[11:32:50] <Roguish> I will find and read.
[11:34:43] <seb_kuzminsky> jepler: is that halcompile fix appropriate for 2.6?
[11:35:27] <jepler> seb_kuzminsky: 2.6 is almost certainly affected, but no in-tree components are affected (in either version)
[11:36:23] <seb_kuzminsky> ok, then i'll try to cherrypick it back this evening
[11:39:02] <seb_kuzminsky> lol, is that an EMC2 logo?? http://www.tormach.com/blog/students-engineer-championship-competitive-robots-with-tormach/
[11:39:48] <jepler> boy I just can't read enough about these "EM Drive" experiments
[11:46:07] <seb_kuzminsky> is that the microwave resonant cavity one that generates thrust with no reaction mass?
[11:46:26] <seb_kuzminsky> it's powered by newton spinning in his grave
[11:49:08] <jepler> seb_kuzminsky: yes. the tl;dr of the latest news is that it works just the same in a vacuum chamber.
[11:50:37] <jepler> I figure they should strap it to a RTG and get it in orbit. Pointed the right way, it'd be quite clear in under a year that it works.
[11:58:23] <seb_kuzminsky> that's awfully weird isnt it
[11:58:36] <seb_kuzminsky> like those ftl neutrinos a few years ago
[12:03:17] <jepler> in that it's unexplained and the smart money is on some kind of measurement error over new physics? yeah
[12:04:13] <jepler> well in fact I think the pascal's wager matrix tells you that you should place a bet against the EM drive. If you win your bet, you double your money. If you don't win your bet, well, the asteroid mining is likely to increase everyone's standard of living.
[12:04:19] <jepler> .. more than the amount you bet
[12:06:01] <jepler> at least it doesn't look like a tabletop fusion scam in that at least 3 separate (and all slightly different) devices have been built and tested by two groups and all reported anomalous thrust
[12:07:02] <jepler> of course, in the "smarter men than me" department, Greg Egan was quite peeved about the reporting on this back in 2006. https://golem.ph.utexas.edu/category/2006/09/a_plea_to_save_new_scientist.html
[12:07:14] <jepler> "I really was gobsmacked by the level of scientific illiteracy in the article"
[12:07:43] <seb_kuzminsky> huh, i had not expected greg egan to say gobsmacked
[12:09:06] <jepler> I sohuld double check, perhaps I am accidentally reading @FakeGregEgan's twitter feed
[12:10:20] <seb_kuzminsky> that quote is in the golem post, attributed to egan
[12:14:02] <Roguish> ok, I just set up a phone interview with Google.
[12:14:58] <Roguish> mech engr position in their Energy group.
[12:15:18] <Roguish> long shot, but gotta go for it !!!
[12:16:45] <seb_kuzminsky> good luck!
[12:29:18] <seb_kuzminsky> jepler: you infected me with interest in the em drive
[12:30:23] <jepler> seb_kuzminsky: sorry :-/
[12:30:30] <jepler> let me know when you figure out what's really going on though
[12:32:16] <seb_kuzminsky> Dr White has a model that predicts (post-dicts?) all 3 groups' experimental results, using electron/positron virtual particles as the propellant in a magnetohydrodynamic flow
[12:33:30] <seb_kuzminsky> his model predicts 1300 Newtons of thrust at 100 kWe input
[12:34:00] <jepler> somebody should make a reprap that uses these instead of steppers
[12:39:29] <archivist> I think it will be Maxwell doing the spinning in his grave not Newton
[12:57:29] <andypugh> Maybe yiou can put Maxwell’s Demons in little hamster wheels?
[13:43:36] <seb_kuzminsky> hi brlcad
[13:56:59] <brlcad> hi seb_kuzminsky!
[13:57:56] <brlcad> hopefully should have sorted out which student will work on that project today or tomorrow
[13:58:46] <seb_kuzminsky> sweet!
[15:57:59] <Roguish> Hey all you programmer guys. I need to pick up some Python. know any good, very simple web based tutorials for none programmers?
[16:04:35] <seb_kuzminsky> codecademy
[19:15:07] <Roguish> seb_kuzminsky: thanks. i'll check it out.