#linuxcnc-devel Logs

Feb 21 2017

#linuxcnc-devel Calendar

09:46 AM jepler: seb_kuzminsky: thanks for the update
10:41 AM seb_kuzminsky: wow, the softiron folks put a stretch-amd64 machine on the net and gave me a login so i can test it out
10:41 AM seb_kuzminsky: i'm impressed!
10:43 AM Roguish: seb_kuzminsky: you're the man....
10:45 AM seb_kuzminsky: i meant stretch-arm64
10:45 AM seb_kuzminsky: i guess my fingers are used to that other architecture
01:19 PM andypugh: I wonder how hard it would be to get uspace running on OSX?
01:19 PM andypugh: https://developer.apple.com/library/content/documentation/Darwin/Conceptual/KernelProgramming/scheduler/scheduler.html
01:20 PM andypugh: Not that I expect there is much demand. If you only have Apple hardware you could dual-boot to Linux anyway.
01:27 PM pcw_home: Doesn't sim run on FreeBSD now?
01:32 PM andypugh: It was hearing that which made me wonder. OSX is a BSD vriant.
01:33 PM pcw_home: might be interesting to start there and see where building fails
01:36 PM andypugh: Normal LinuxCNC gets as far through configure as “configure: error: pkg-config is required to build LinuxCNC"
01:38 PM pcw_home: looks like pkg-config is available for OSX
01:38 PM pcw_home: not sure how its added
01:39 PM cradek: probably not too hard except for satisfying dependencies
01:40 PM andypugh: Hmm, someone has been busy: https://www.youtube.com/watch?v=iACXC3MJxMk
01:42 PM cradek: wow. surprising to not use gremlin.
01:56 PM seb_kuzminsky: i think uspace does not run on freebsd yet
01:58 PM seb_kuzminsky: stretch-arm64 installs and runs without problems as a guest on a stretch-arm64 hypervisor
01:58 PM seb_kuzminsky: i could not get jessie-arm64 to install, it would not detect any disks or cdroms attached to the gues
02:01 PM seb_kuzminsky: i have not yet gotten stretch-armhf to install as a guest on a stretch-arm64 hypervisor, the virtualized armv7 doesn't seem to have uefi boot firmare afaics
02:04 PM KGB-linuxcnc: 03Dewey Garrett 05dgarr/external_offsets 3db9014 06linuxcnc 10(40 files in 12 dirs) External Axis Offset hal pins * 14http://git.linuxcnc.org/?p=linuxcnc.git;a=commitdiff;h=3db9014
02:04 PM seb_kuzminsky: does anyone have an opinion on dgarr's aux_apps branch? it looks useful to me
02:05 PM cradek: jepler: thank you for dealing with that
02:11 PM cradek: aux_gladevcp_apps?
02:18 PM seb_kuzminsky: yeah, _v2 i think
02:20 PM seb_kuzminsky: it's intended to facilitate moving things like guis and gui add-ons out of linuxcnc.git and into their own separate repos
02:33 PM cradek: that is a very good goal
02:38 PM kwallace2: I saw this on a foam cutter running Mach3 : https://www.inventables.com/technologies/usb-motion-controller
02:38 PM kwallace2: Does anyone know what's inside and how it works?
02:41 PM cradek: > Automatic firmware checking and upgrade
02:42 PM cradek: http://cncdrive.com/MC/UC100%20datasheet/UC100%20users%20guide.pdf
02:45 PM cradek: ftdi [serialish] usb interface
03:06 PM kwallace2: cradek, thank you for the link. I was trying to talk the owner into thinking about using LinuxCNC instead, of course, but I had no information on what he had. I thought it would be hard to have true realtime motion control in such a small package.
03:06 PM cradek: looks like it does a lot
03:06 PM cradek: somehow
03:10 PM kwallace2: It doesn't seem to be all that cheap ($125). I can put together a PC for less than that.
03:11 PM Tom_L: for that dongle??
03:11 PM jepler: you can put a lot of software in a little microcontroller these days, and a TQFP-64 isn't a particularly small part either
03:11 PM jepler: GRBL and other embedded motion software are proof of that
03:11 PM jepler: then you just have to spend the dev time to make it work well enough with mach3 and you are printing money
03:14 PM kwallace2: The same maker space has a mini router running an obligatory Arduino and GRBL. I'm putting together a PC to run an informal demo on the router.
03:16 PM andypugh: It looks like basically a smoothstepper for generic breakout boards.
03:17 PM andypugh: It probably works perfectly well, with Mach. And Mach works perfectly well too.
03:17 PM andypugh: (Except for lathes, of course :-)
03:18 PM kwallace2: Hmm... I just remembered I have a picture, sort of: https://www.meetup.com/Motherlode-Makers/photos/27592484/
03:23 PM seb_kuzminsky: build (including docs) on a single cpu arm64 guest on the softiron od1k took 37 minutes
03:24 PM jepler: kvm guest?
03:24 PM jepler: afk
03:29 PM seb_kuzminsky: yeah, stretch-arm64 guest on stretch-arm64 KVM hypervisor
03:35 PM seb_kuzminsky: and all the tests pass, yay
03:35 PM seb_kuzminsky: the only obstacle now i think is getting an armv7/armhf guest to run on this hypervisor
03:45 PM jepler: my experience with the dragonboard was that there were only a few very minor items needed to complete a (sim only) arm64 build, so I'm glad that hasn't bitrotted somewhere in the meantime
03:47 PM seb_kuzminsky: the new fans for my U3s came in, now i need to machine some kind of mounts for them on the enclosure
04:51 PM jepler: I bet I could get the job done sooner with my glorified glue gun^W^W^W3d printer, ignoring time the part would spend in the mail :-P
04:51 PM seb_kuzminsky: heh maybe
04:51 PM jepler: (hmmm instead of the possibly-trademarked FDM term perhaps we shold call them GGG printers)
04:52 PM seb_kuzminsky: i've got an old scsi enclosure, i'm planning to drill a tight grid of little holes in the roof and screw the fan on there
04:52 PM seb_kuzminsky: it'll blow down on the u3 heatsink
04:53 PM jepler: I was envisioning a plastic bracket that has one set of screw holes for the fan and another that matches the mounting screws of the board itself like http://www.thingiverse.com/thing:1667026
04:54 PM jepler: then you just need to 3d print M4 screws the right length
04:54 PM seb_kuzminsky: i like it!
04:55 PM seb_kuzminsky: it'd be more convenient to have the fan stay with the u3 when i take the case apart, instead of coming off with the top of the enclosure
04:55 PM jepler: easy to fabricate from a sheet of alu too
04:56 PM andypugh: I find myself increasingly surprised that I don’t have a 3D printer. The use I see myself most interested in would be printing patterns and core-boxes to be cast in iron (I play with 100+ year old vehicles) . I am thinking big-linear-delta. Any counter-proposals?
04:56 PM seb_kuzminsky: yeah
04:57 PM seb_kuzminsky: andypugh: go for it :-)
04:58 PM jepler: this guy's results with lost-PLA casting looked pretty good to me http://3dtopo.com/lostPLA/
04:58 PM andypugh: Though, oddly, the thing that has recently piqued my interest has been seeing 3D-extruded ceramis that can then be fired.
05:00 PM andypugh: jepler: Different game. I would be looking at re-usable patterns to make conventional (and multiple) iron castings.
05:02 PM jepler: I'm not familiar enough to see how 3d printing is going to fit into the workflow
05:05 PM andypugh: jepler: The last picture here: http://bodgesoc.blogspot.co.uk/search/label/Holbrook03%20Pattern%20Making is the result of a solid month of evenings assembling and machining blocks of MDF.
05:07 PM andypugh: Ansd what I want to be able to make are patterns for these engines: http://hmvf.co.uk/forumvb/showthread.php?13636-1908-Dennis-Truck&p=453664#post453664
05:08 PM andypugh: (scroll through, it’s an amazing story and bit of luck)
05:11 PM jepler: so you send off a part that is the shape of the thing you want cast in iron, but it doesn't have to be any particular substance that can withstand melted iron temperature .. ?
05:11 PM andypugh: Yes, though it needs to be 2% bigger.
06:17 PM jepler: based on a 30kg casting, I came up with an approximate 3800cm3 of iron, or 3900cm3 of PLA after accounting 3% for shrinkage. (this all assumes you print your model 100% solid). That's 4.8kg of the stuff, or $96 at $20/kg, and if you're using the typical 1kg spools that's 4 spool changes. At an optimistic plastic flow rate rate of 30mm3/s (e3d volcano with 1.2mm nozzle) it's ~36 hours to extrude t
06:17 PM jepler: he full volume, excluding extra time for rapids and retracts in the part program.
06:20 PM jepler: hopefully you can finish it in the way that the individual threads of extruded pla don't appear on the final part (unless that's a look you're going for), getting a good soft finish by sanding PLA seems tougher than with MDF (or at least you have different challenges)
06:22 PM seb_kuzminsky: just hotbox your garage with acetone vapor
06:24 PM JT-Shop: I'd like to do some lost PLA casting now that I have a 3d printer
06:25 PM JT-Shop: http://gnipsel.com/images/casting/
06:25 PM JT-Shop: that's the burner and furnace I built a while back
06:39 PM kwallace2: JT-Shop, You must go through a lot of soup. I have a similar setup and find the propane burner is handy as a general purpose torch too: http://www.wallacecompany.com/machine_shop/Furnace/
06:45 PM JT-Shop: popcorn tin
06:47 PM kwallace2: Ha, that makes sense. Now, I'm hungry for popcorn.
06:49 PM JT-Shop: I need to make an oil fired burner one day
06:50 PM JT-Shop: lol I have all of Myfordboy's videos downloaded and saved
06:55 PM kwallace2: It's not convenient, but creates a lot of heat and lasts. I make more waste oil than I use in the furnace, although I don't use the furnace very often. I also had this follow me home: http://www.wallacecompany.com/machine_shop/fire_master_h1818/fire_master_index.html . Much larger and more convenient. You probably recall me posting this before, but it's still on my todo list, someday: http://www.mdpub.com/scopeworks/hexagons/index.html
06:56 PM kwallace2: Myfordboy videos are a favorite.
06:57 PM JT-Shop: nice kiln
06:58 PM JT-Shop: I have one of the round ones and use it to powder coat
07:00 PM kwallace2: Hmm, I haven't thought of powder coating. I'd like to do vitreous enamel too.
07:02 PM JT-Shop: it's pretty easy to do
07:02 PM * JT-Shop calls it a night
07:08 PM kwallace2: Good night.
11:31 PM pcw_mesa_ is now known as pcw_mesa