#linuxcnc-devel Logs

Jun 26 2018

01:26 PM andypugh: I wonder if he is correct? https://forum.linuxcnc.org/49-basic-configuration/34752-y-axis-movement-on-x-axis-straight-line-move-related-to-backlash-comp#112640
01:28 PM andypugh: And is ot worth raising a bug tracker on it?
02:05 PM hazzy-lab: andypugh: That is very interesting, I think I have observed that. My backlash comp is only .0015in so it's very slight
02:07 PM cradek: it would be great to know if someone can reproduce it in a sim config
02:07 PM cradek: I use backlash comp on one of my lathes and have never seen anything untoward
02:13 PM rmu: backlash comp can't really work in a situation where the machine moves perpendicular to the compensated axis anyway, because the controller doesn't necessarily know on which side the tool is cutting (if at all)
02:14 PM andypugh: hazzy-lab: Rene seems to be planning to make many more V4.3 STMBL drives. Does that mean you now want 2 or still only 1?
02:15 PM andypugh: rmu: It only moves when the axis changes direction, it doesn’t attempt to comensate for cutting forces (but does allow the programmer to do that with careful approach directions)
02:16 PM cradek: that is all true, but it's the best we can do with software to compensate for poor hardware, and is sometimes helpful.
03:12 PM pcw_mesa: any ideas how to compile mesa_7i65 in uspace? it does not get built by default
03:15 PM pcw_mesa: ( trying to figure out whats going wrong in RTAI: mesa_7i65 causes a kernel panic there about every third time you run it )
03:19 PM andypugh: I think mesa_7i65 is a normal .comp file, so halcompile ought to do the trick.
03:23 PM pcw_mesa: it doesn't seem to find hostmot2.h
03:27 PM andypugh: Hmm
03:28 PM andypugh: Try the undocumented INCLUDE function?
03:28 PM andypugh: (before the ;; marker)
03:31 PM pcw_mesa: ok i will compile from the mesa_hostmot2 directory (but the sources are not there)
03:32 PM pcw_mesa: well I mean it will try to compile but fails with undefined types
03:37 PM andypugh: I think that you need someone handier with a compiler than me to help here.
03:37 PM andypugh: I always just give up and recompile all of LinuxCNC :-)
03:38 PM pcw_mesa: I did but that doesn't work
03:38 PM pcw_mesa: (mesa-7i65 is not compiled)
03:38 PM andypugh: But it is for RTAI?
03:39 PM pcw_mesa: Yes I think so (but causes a kernel panic when run)
03:40 PM pcw_mesa: well it works 2/3 times and crashes the PC on the ~third launch
03:43 PM mozmck: If you change the include line from "../../../hal/drivers/mesa-hostmot2/hostmot2.h" to just "./mesa_hostmot2/hostmot2.h" it will find the file, but on my system it spits out a bunch of other errors.
03:45 PM pcw_mesa: Yeah I got there by running halcompile --install ../mesa_7i65.comp from mesa_hostmot2
03:45 PM mozmck: Did it compile or give a bunch of other errors then?
03:46 PM pcw_mesa: bunch of missing type errors
03:47 PM mozmck: yeah
03:48 PM pcw_mesa: so maybe thats why its not built by default for uspace ( I was just trying to get more data points on why it causes a kernel panic, uspace is more forgiving )
03:52 PM andypugh: pcw_home: Is the kernel panic complete or partial? Do you get to see the log output?
03:53 PM andypugh: pcw_home: https://github.com/LinuxCNC/linuxcnc/blob/master/docs/rtfaults.txt
03:53 PM andypugh: Is how I normally address this
03:53 PM andypugh: But as the module author, and posessor of a 7i65, I probably ought to be the one to fix it.
04:00 PM pcw_mesa: sometimes you get a bit of a log, other time it just crashes with no reports
04:00 PM Tom_itx is now known as Tom_L
04:02 PM andypugh: pcw_home: Do you want to raise a bug tracker and assign it to me?
04:03 PM rene-dev_: hazzy-lab yes, im making some.
04:06 PM hazzy-lab: rene-dev_: Great, how many IRAMs do you have left?
04:09 PM rene-dev_: plenty
04:10 PM pcw_mesa: andypugh yeah, not sure how you assign it though
04:11 PM andypugh: pcw_mesa: Thingy on the right
04:13 PM pcw_mesa: Still dont see, do you mean the @?
04:15 PM pcw_mesa: well it needn't be assigned to you, actually I think someone else (on the forum) was poking at it last
04:17 PM pcw_mesa: Ill see if I can gather any useful kernel messages
04:39 PM pcw_mesa: https://pastebin.com/dh0TsGTC (terminal)
04:39 PM pcw_mesa: https://pastebin.com/j9CwVsyW (dmesg)
04:52 PM andypugh: Hmm, nothing leaps out at me
05:00 PM andypugh: cradek: This car dash panel is reminscent of one of your clocks. https://youtu.be/QP07Jq5b88M?t=3m47s
05:00 PM andypugh: It’s great and I want it.
05:10 PM pcw_mesa: With more testing it seems I only every get the oops at shutdown
05:11 PM pcw_mesa: and random (maybe a race at shutdown)
06:02 PM skunkworks: andypugh: how much are the drives?
06:02 PM andypugh: skunkworks: The kits I assembled came in at £90 each.
06:03 PM skunkworks: that is cheap - how many amps?
06:04 PM skunkworks: as in current
06:04 PM skunkworks: ;)
06:07 PM skunkworks: Wonder if this is related to the backlash issue https://www.cnczone.com/forums/tormach-pathpilot-/354884-tormach.html
06:08 PM skunkworks: No.. I think that is just a wrong backlash amount
06:08 PM skunkworks: nevermind
06:10 PM andypugh: skunkworks: 20A / 350V
06:11 PM andypugh: But 2.2kW limit
06:11 PM aircooled is now known as hazzy-lab
06:14 PM andypugh: skunkworks: Assembly instructions http://bodgesoc.blogspot.com/2018/05/STMBL.html
06:27 PM skunkworks: wow - he had the boards partially assembled from PCBAStore?