#linuxcnc-devel | Logs for 2016-02-15

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[11:32:36] <KGB-linuxcnc> 03John Thornton 052.7 13480af 06linuxcnc 10docs/src/config/pncconf.txt Docs: add info about editing a config * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=13480af
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[14:43:34] <skunkworks> I like how he doesn't mention linuxcnc https://groups.yahoo.com/neo/groups/mach1mach2cnc/conversations/messages/150096
[14:44:41] <skunkworks> seb_kuzminsky, deb?
[14:45:13] <archivist> he is very blinkered
[14:46:17] <archivist> its the linux is scary problem
[14:46:30] <skunkworks> yes - he has
[14:46:37] <skunkworks> very very complicated
[15:03:06] <pcw_home> hmm, how many times do I need to ask mister "dead-in-the-water" what OS he's running?
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[15:17:22] <skunkworks> pcw_home, sorry...
[15:24:57] <skunkworks> heh
[15:24:58] <skunkworks> https://groups.yahoo.com/neo/groups/mach1mach2cnc/conversations/messages/150097
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[15:27:35] <cradek> Date: Tue Mar 21 02:42:28 2006 +0000
[15:27:47] <cradek> we're coming up fast on our 10 year anniversary of having threading
[15:28:06] <cradek> jeez I've been working on linuxcnc a long time
[15:29:30] <archivist> when was the last threading bug.. 2009 when I had a problem in 2.3, fixed in 2.4
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[15:31:45] <cradek> yeah it's sure had some fixes over time
[15:32:21] <skunkworks> it must suck as a motion control mfg to have to come up with your own treading/tapping logic
[15:33:44] <archivist> js was talking about that the other day, seems the delay external to internal is a killer
[15:34:12] <archivist> fscks up the shoulder, has to have a safety groove
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[15:35:38] <cradek> there but for the grace of smart predecessors and a good initial design
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[16:33:53] <seb_kuzminsky> skunkworks: deb http://highlab.com/~seb/linuxcnc jessie main
[16:35:46] <seb_kuzminsky> there's -rt kernels for amd64 and 686-pae
[16:35:50] <seb_kuzminsky> haven't tried them yet
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[16:42:27] <jepler> I had overnight latency of ~300us on my laptop
[16:42:42] <seb_kuzminsky> how does your laptop run with rtai?
[16:42:47] <jepler> I think the 4.1-rt may have been better on that particular hardware but I don't know for sure
[16:42:50] <jepler> I haven't run rtai there
[16:45:35] <jepler> .. I really can't imagine ever using rtai again, for my own needs. I'd much rather debug uspace, and if I never have to do software step generation again I'll be happy.
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[16:54:35] * skunkworks agrees.. (except for debugging uspace)
[16:56:03] <pcw_home> I had stability issues with 4.4.1-rt6 so went back to 4.4.1.5
[17:00:15] <jepler> I'm not sure which combination of patches is in this debian packages
[17:00:36] <jepler> it looked like they use a broken up set of patches,so it might not exactly correspond to any specific -rt release
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[18:29:07] <CaptHindsight> happy to test any packaged RTAI test kernels on 2.7
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[19:01:32] <skunkworks> pcw_home, http://www.cnczone.com/forums/servo-motors-drives/299340-switch-resolver-encoders.html
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[19:35:06] <seb_kuzminsky> jepler: 80 us worst case latency after ~1 hr here, on a machine that runs all day with 1/10 of that with rtai
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[19:42:25] <skunkworks> sounds like normal rt_preempt.
[19:42:37] <skunkworks> I have not gotten to it yet. Been one of those days.
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[19:53:35] <PCW> seb_kuzminsky: what hardware? I get a lot better on fast hardware than slow ( Atoms are terrible with Preempt-RT newer fast Intel are quite good )
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[19:59:28] <jepler> mine's a i5-3220M fwiw. I guess
[19:59:32] <jepler> that's not particularly new anymore
[19:59:49] <jepler> launch Q2'12 according to intel
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[21:26:53] <JT-Shop> PCW: iirc you have some sample configs for the 5i25?
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[21:30:41] <PCW> I have some but they are just 5i2x sample configs with the card name changed in the ini file
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[21:31:07] <PCW> pncconf probably makes better sample configs
[21:31:22] <JT-Shop> ok i'll make some up
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[21:37:58] <PCW> theres an old one here:
[21:37:59] <PCW> http://freeby.mesanet.com/7i77.zip
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[21:43:08] <JT-Shop> thanks
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[23:31:59] <skunkworks> The matsuura has a resolver on the spindle motor - cradek you figured out it was not usable? (multi-pole?)
[23:32:37] <skunkworks> (I don't think we would try to use it anyway.. It is still being used for the existing spindle drive.
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[23:38:46] <cradek> I think the vfd needed it - mine was not usable - it had like 100 poles and the pico resolver board couldn't come close to driving it
[23:39:16] <skunkworks> That is what I remember. - plus it is on the spindle
[23:39:22] <skunkworks> *spindle motor
[23:39:26] <cradek> it would have made an unreasonable count rate if it had worked
[23:39:31] <cradek> yes on the motor
[23:39:49] <skunkworks> I think we have the a decent solution if we can get the gear tooth counting well.
[23:40:00] <skunkworks> 69 teeth
[23:40:26] <cradek> yeah that should be good enough if your sensors are fast (don't have much hysteresis)
[23:40:58] <cradek> I suppose it couldn't be worse than a half tooth, so it will be fine
[23:41:25] <skunkworks> they say they will count a 60 tooth gear up to 12krpm
[23:41:36] <skunkworks> (this is 6krpm spindle)
[23:41:40] <skunkworks> so time will tell
[23:41:44] <cradek> neat
[23:42:02] <cradek> mine loses count when it goes fast (ttl encoder) but who cares
[23:43:53] <skunkworks> we have been using ttl-dif converters from digikey. (they have 5 pun plug on one end - dif pigtail on the other end