#linuxcnc-devel | Logs for 2014-07-10

[21:29:41] <jepler> dgarr: thanks for that feedback
[21:31:54] <dgarr> no problem, thanks for uspace work
[21:57:34] <skunkworks> logger[psha]:
[21:57:34] <logger[psha]> skunkworks: Log stored at http://psha.org.ru/irc/%23linuxcnc-devel/2014-07-11.html
[22:03:40] <skunkworks> http://electronicsam.com/images/KandT/testing/DSC_1915.JPG
[22:03:45] <skunkworks> starting to look like
[22:04:27] <skunkworks> http://electronicsam.com/images/KandT/testing/Screenshot%20from%202014-06-23%2010:32:46.png
[22:04:55] <skunkworks> start with a 5.5 inch shaft... remove everything that doesn't look like the drawing..
[22:05:44] <skunkworks> all the manual stuff is done (lathe work) now I can slap it on the k&t and do the rest
[22:08:02] <skunkworks> http://electronicsam.com/images/KandT/testing/DSC_1917.JPG
[22:13:35] <dgarr> jepler, fwiw my amd machine that runs old rtai but has problems with new rtai has poor latency with preempt_rt and rtos-uspace-apis: http://www.panix.com/~dgarrett/stuff/uspace-rt.png
[22:14:35] <dgarr> oops, link is http://www.panix.com/~dgarrett/stuff/amd_uspace_rt.png
[22:23:30] <pcw_home> dgarr: pretty sure you will have to disable the base thread to get meaningful results from preemt_rt
[22:24:54] <pcw_home> (the default 25 usec base thread period is probably about twice preemt_rt's latency)
[22:28:46] <skunkworks> it seems also that nvidia is less tollerated now.. (2 videos - one onboard and one pcie that both ran decent on 10.04 don't run well with latest rtai image.
[22:29:20] <pcw_home> well the driver as probably been improved
[22:34:13] <dgarr> pcw_home: yes but this one is preempt_rt with uspace: http://www.panix.com/~dgarrett/stuff/uspace-rt.png
[22:36:54] <pcw_home> I still think you need to turn of the base thread
[22:37:24] <CaptHindsight> 3.12.22-rt34 was running ~32uS, getting closer to 25uS
[22:41:44] <dgarr> you are probably right but the machine is off now
[22:44:56] <skunkworks> http://electronicsam.com/images/KandT/testing/IMG_20140626_174011_685.jpg
[22:45:38] <seb_kuzminsky> skunkworks: i like the blue chips. and the freecad model
[22:45:58] <skunkworks> seb_kuzminsky: my first freecad drawing..
[22:46:14] <seb_kuzminsky> it's getting totally usable, imo
[22:46:31] <seb_kuzminsky> i'm looking forward to the assembly module and the cam module :-)
[22:46:46] <skunkworks> sure - I just have never used parametric cads before...
[22:47:29] <skunkworks> there are some anoying things.. like working in english - some things like array type operations are only metric (cannot even put " behing them)
[22:47:40] <skunkworks> behing
[22:47:43] <skunkworks> jeeze
[22:47:46] <skunkworks> behind
[22:48:38] <skunkworks> I suppose I should just work in metric...
[22:48:56] <seb_kuzminsky> then it would match pycam, which is also in metric ;-)
[22:49:42] <skunkworks> but the k&t has english ball screws!
[22:49:57] <seb_kuzminsky> good thing it runs linuxcnc which handles both ;-)
[22:50:46] <skunkworks> the blue chips where all over the shop...
[22:50:57] <skunkworks> (I have a few burn marks on my arms...)
[22:51:00] <seb_kuzminsky> i bet!
[22:51:18] <seb_kuzminsky> i like the impromptu shim stock
[22:51:21] <seb_kuzminsky> what's the crank for?
[22:52:15] <skunkworks> I am working on a stirling engine - I need a test bed to play with head shapes..
[22:52:59] <skunkworks> I am converting a old 2 cylinder air compressor - So I need to adjust the crank so it will be 90deg out of phase instead of 180..
[22:54:36] <skunkworks> the way the air compressor is built - I can just sort of cut off one side. make a new replacement that I can bolt together 90deg out.
[22:55:32] <skunkworks> (crank)
[22:56:21] <skunkworks> which is good because that side of the crank journal was gulled.
[23:40:23] <CaptHindsight> ok, new test system working, 3.4.55 RTAI on Mint Mate 17 that uses the Trusty repos latency is >80K, same system with LiveCD <6K
[23:43:29] <CaptHindsight> used http://buildbot.linuxcnc.org precise master-rt
[23:44:08] <CaptHindsight> and had to use some older packages from precise liboost-python and 2 others
[23:49:51] <seb_kuzminsky> wow, that's terrible!
[23:55:59] <CaptHindsight> installing Mint Debian Mate now