#linuxcnc | Logs for 2013-12-19

[00:52:44] <Mr_Mayhem> http://www.imagesco.com/nitinol/biometal-fiber.html Take that, stepper motors! Well maybe someday.
[01:43:40] <Valen> I just had an idea
[01:43:54] <Valen> make a rod of something with a large CTE
[01:44:12] <Valen> put a sleve over said rod that was very slightly larger in the middle
[01:44:31] <Valen> spot heat the rod so it bulges to fill the sleve
[01:44:44] <Valen> my differentially heating the rod you move up and down said rod
[01:44:48] <Valen> s/my/by
[01:51:14] <CaptHindsight> http://www.kickstarter.com/projects/1575992013/logi-fpga-development-board-for-raspberry-pi-beagl
[01:51:29] <CaptHindsight> yikes! $89 for BBB IO board with an FPGA and 256MB of SDRAM
[02:47:45] <mrsun_> hmm an ordenary overhead projector should be usable as a optical comparator? =)
[02:48:52] <archivist> depends how you define optical comparator
[02:50:12] <mrsun_> well a crude one atleast, to get a blown up version of stuff to compare to something
[02:50:25] <mrsun_> but a real optical comparator seems a bit more usefull :P
[02:58:50] <Valen> archivist shouldn't you be in bed?
[03:05:29] <mrsun_> does archivist sleep ?
[03:05:32] <mrsun_> dont think so ...
[03:06:30] <archivist> nearly 9 am
[03:15:33] <archivist> mrsun_, http://i122.photobucket.com/albums/o248/moorbrook1860/SetupPhoto_zps22fa0772.jpg
[03:16:08] <archivist> the other kind, the optics are for multiplying the movement
[03:16:40] <archivist> I have an OMT here but different model
[03:17:24] <archivist> also microscope above an XY stage is a good option
[03:19:18] <archivist> my homebrew http://www.collection.archivist.info/archive/DJCPD/PD/2013/2013_09_03_travelling_microscope/
[03:33:46] <Mr_Mayhem> very cool. Ever mess with one of those usb microscopes? Neat way to look around when mounted in cnc.
[03:34:47] <Mr_Mayhem> I see micro adjustments; nice work.
[03:41:14] <Deejay> moin
[03:48:10] <kengu> next project, but this will not be linuxcnc, https://www.dropbox.com/s/zo7ipwy2cjz482q/20131219_005.jpg
[03:49:35] <Mr_Mayhem> Looks like a dual head monster router.
[03:49:51] <kengu> yes it does
[03:51:11] <kengu> there were also some drills and saw blade attached that I could see. that will be the project for next year. it should be in working order and fully functioning. just power it up and start running
[03:51:55] <Mr_Mayhem> What runs it if not linuxcnc?
[03:52:18] <kengu> something from here, http://www.num.com/web/num.nsf/id/home-en
[03:53:00] <kengu> it is from 1998 and I could not get my hands on the documentation yet. next year (:
[03:54:51] <Mr_Mayhem> Is that for yourself or a client? Like, what would one make with it once it is working? Cabinets, house beams, Doors. I would do speaker enclosures for fun, ha.
[03:55:21] <Mr_Mayhem> Make some killer sub boxes heh.
[03:56:20] <kengu> it is sort of "joint" venture. as in it is for client but I will get full access to it and if they manage to do the products they are thinking with my help then I will get more money.
[03:57:47] <kengu> but yeah. I do not have experience with that kind of machines. ones that do not run linuxcnc in the end. ones that are this big or something that uses fibre optics to transmit signals. But I will learn
[03:58:48] <Mr_Mayhem> Oh, they use fiber? Good idea, to avoid interference.
[03:59:14] <Mr_Mayhem> I see, so you have access to it without needing to pay for it. Best of all possible worlds, I suppose.
[04:00:06] <Mr_Mayhem> I was thinking of this engineer I met in Rochester, NY.
[04:00:22] <Mr_Mayhem> He worked for Xerox and others in audio his whole life. Sold ultrasonic cleaners he designed for the medical field. Anyway, he had these huge diy bass horns filling the corners of his living room. Driving it with a 6" Radio Shack cheapie, he shook the house so bad stuff started falling off the wall.
[04:01:13] <Mr_Mayhem> The miracle of properly formed horn with big sheets of mdf or plywood.
[04:01:30] <Mr_Mayhem> With a machine like that, easy peasy.
[04:03:49] <Mr_Mayhem> Yeah, just play with it till it works kind of thing. With manual in hand, of course.
[04:06:03] <Mr_Mayhem> I had a hell of a time finding the manual for my VFD. One day, someone posted it in the cnc forum. It was like several months after I bought the machine.
[04:06:42] <kengu> Mr_Mayhem: that machine should come with pile of documents.
[04:06:51] <kengu> as in bunch of folders to help with
[04:08:27] <Mr_Mayhem> I know, I was doing the "my first cnc" stunt by buying a yoocnc from china. My beginner machine for $1,950 delivered. Not a real serious machine like what you deal with.
[04:08:57] <kengu> Mr_Mayhem: those smaller ones are easy
[04:09:06] <Mr_Mayhem> But enough to learn from square one. Started with Linuxcnc on an old dell.
[04:09:44] <Mr_Mayhem> Yeah. I see how crazy it can get with toolchanger, and all kinds of other things to consider.
[04:09:53] <kengu> i did do plasma cutter conversion and laser cutter conversion and I did not do ncstudio->linuxcnc on the smaller (1400*2500) router (yet)
[04:10:45] <Mr_Mayhem> What do you use then in the meantime?
[04:10:57] <Mr_Mayhem> Same as above or Mach?
[04:11:28] <Mr_Mayhem> Oh, duh. Ncstudio.
[04:13:09] <Mr_Mayhem> It would be fun to work with a machine like that. I hear the plasma needs to have a height thing to keep it behaving as it goes.
[04:13:23] <Mr_Mayhem> Or something like that.
[04:14:12] <kengu> yeah. thc or atc to google if you need more info on that
[04:14:20] <kengu> there is not one on that plasma, yet.
[04:19:10] <Mr_Mayhem> So, the machines you do are for metal cutting. I wonder what they often make with such machines. Like I sort of know, but I don't really know what the plasma or laser cut parts are most commonly used for.
[04:19:44] <Mr_Mayhem> I guess it's a wide spectrum of uses.
[04:21:36] <Mr_Mayhem> Here in Vegas there are many shops contracting work for the casinos, like decorative metal, marble, wall treatments, etc.
[04:22:33] <Mr_Mayhem> We have like 15 cnc related shops in town, by my estimate looking at google maps.
[04:25:54] <Mr_Mayhem> A bunch of waterjet places too.
[04:28:13] <kengu> cool .. perhaps
[04:28:33] <kengu> you do not have to have your own as there is some competition if you need to get something done
[04:28:40] <kengu> to get the price right
[04:28:55] <kengu> Mr_Mayhem: for wood mainly
[04:32:33] <ReadError_> I do a lot of G10
[04:34:57] <Mr_Mayhem> Really? I just cut my first printed circuit board. What do you make? Sounds like either PCBs or quadcopter frames. :)
[04:36:30] <Mr_Mayhem> I used the autoleveler app to correct for un-level board relatve to the tool, and my second board was perfect.
[04:36:48] <ReadError_> lol quads mostly
[04:36:57] <Mr_Mayhem> Nice.
[04:37:16] <Mr_Mayhem> That is a good application. How do you keep the dust down?
[04:37:46] <ReadError_> dust boot + 2 cyclone filters + hepa filter
[04:38:05] <Mr_Mayhem> Holy cow, you got serious!
[04:38:34] <ReadError_> http://www.dailygusta.com/Phone/i-38bxCSt/0/X3/CA_12151314233265-X3.jpg
[04:38:38] <ReadError_> thats a few days of dust
[04:38:38] <Mr_Mayhem> Next I expect to hear cleanroom air management system.
[04:39:21] <ReadError_> nah this cuts down most the stuff
[04:39:40] <Mr_Mayhem> Wow. what cutter tools (company wise) do you prefer? I know G10 is harsh on tools.
[04:40:17] <ReadError_> i use burr endmills mostly from ebay, kyocera (spelling?) mostly
[04:41:03] <Mr_Mayhem> Yep. Are they also called chip breaker end mills? I have those.
[04:41:38] <Mr_Mayhem> Like they have lots of tiny spikes flared out on the surface of the tool, and a spiral pattern.
[04:42:50] <Mr_Mayhem> http://www.precisebits.com/products/carbidebits/fcrouter.asp is what I use to cut through.
[04:42:55] <ReadError_> chipbreakers are a bit different
[04:43:04] <Mr_Mayhem> oh
[04:44:18] <ReadError_> http://i.ebayimg.com/t/1-4-LOW-SHEAR-ROUTER-BURR-FOR-G10-CARVEWRIGHT-/00/$(KGrHqIOKj!E25kk6dgLBNvD0yMOgg~~0_3.JPG
[04:44:26] <ReadError_> http://i.ebayimg.com/t/5-1-8-1250-DIAMOND-CUT-CARBIDE-ROUTER-BURRS-FT-Kyocera-Tycom-/00/s/MTM2OVgxNjAw/$(KGrHqZ,!o!E8VjvRVdbBPU6mYLZ)!~~60_57.JPG
[04:44:28] <ReadError_> 2nd is a burr
[04:44:53] <Mr_Mayhem> I see. http://www.ebay.com/itm/10-1-8-1250-DIAMOND-CUT-CARBIDE-ROUTER-BURRS-FT-Kyocera-Tycom-/151176426635?pt=LH_DefaultDomain_0&hash=item2332d1348b
[04:45:16] <ReadError_> yea drillman1 is good
[04:45:22] <ReadError_> i get most of my stuff from him
[04:46:15] <Mr_Mayhem> What do you use for cad and nesting? I am simply playing with cambam.
[04:46:40] <ReadError_> cambam now mostly
[04:47:47] <Mr_Mayhem> Cool. So I guess you sell kits and people put them together?
[04:49:21] <Mr_Mayhem> I was following crudcnc on youtube, and he was doing something like that, for quadcopters. He made camera mounts or something.
[04:50:31] <Mr_Mayhem> Nice footage of ships at sea filmed from his quadcopter. He works on the ship, and brought his heli along to film the ship on a gopro hd camera.
[04:50:39] <ReadError_> i make some of my own stuff but lately ive been doing alot of work for others
[04:50:57] <ReadError_> http://www.dailygusta.com/Phone/i-6xhjWgV/0/X3/CA_12181308593690-X3.jpg
[04:51:00] <Mr_Mayhem> Yeah, that's how it begins.
[04:52:22] <Mr_Mayhem> Beautiful. Is that carbon fiber? Looks like it. I guess the donut shaped thing is a antenna.
[04:52:50] <ReadError_> yea thats cf there
[04:53:08] <ReadError_> http://www.dailygusta.com/Phone/i-xRhrvRJ/0/X3/CA_12141314573731-X3.jpg g10 there
[04:53:17] <Deejay> re
[04:54:19] <Mr_Mayhem> Very nice. Rockford clamps? Wow, I could so get into that hobby. They go together so neatly with the cnc to make the plates.
[04:54:36] <ReadError_> yea the clamps are great
[04:57:20] <Mr_Mayhem> I want to see someone make an rc gyro computer using HAL from linuxcnc's innards. Hehe. Run it on a beaglebone.
[04:57:42] <Mr_Mayhem> Lord knows it handles servos and is fast enough.
[04:58:00] <archivist_herron> hal needs better maths for that
[04:58:20] <Mr_Mayhem> Yeah, kapfman filters or whatever.
[04:59:18] <Mr_Mayhem> Have it land on something, and cnc it, and fly away, hehe
[04:59:41] <Mr_Mayhem> Ok, that was too much.
[05:00:30] <Mr_Mayhem> But nice work on the quad copters. I love those videos on you tube with them flying in all different cities like a tour. Forget the name of the group.
[05:02:25] <Mr_Mayhem> https://www.youtube.com/watch?v=M9cSxEqKQ78
[05:02:36] <Mr_Mayhem> Team Blacksheep, that's them.
[05:03:07] <Mr_Mayhem> That one is a plane, but other videos are quadcopters.
[05:06:35] <ReadError_> yea they FAA is after trappy now
[05:07:45] <Mr_Mayhem> This is the cruddcnc guy down under. Some ship footage that is nice and smooth. https://www.youtube.com/watch?v=-xvmOEmbyco
[05:08:54] <Mr_Mayhem> Found him because he explained the machine I have, then I saw his other quadcopter hobby vids.
[05:09:13] <kengu> pretty cool
[05:09:47] <Mr_Mayhem> Yeah, isn't it? Pretty pro looking footage.
[05:11:23] <Mr_Mayhem> The neatest quadcopter stuff I found is the guys in Switzerland https://www.youtube.com/watch?v=pp89tTDxXuI
[05:12:37] <Mr_Mayhem> I wonder if there are any open source plans for quadcopters.
[05:12:51] <Mr_Mayhem> Oh, and can't leave out quadcopters building a wall.
[05:12:52] <Mr_Mayhem> https://www.youtube.com/watch?v=JnkMyfQ5YfY
[05:13:24] <Mr_Mayhem> You probably already saw that one, but neat. Kinda like an aerial reprap.
[05:15:35] <Mr_Mayhem> Some serious knowlege of control, positioningm and feedback there.
[05:20:00] <ReadError_> yea i think most of those setups they use motion processing cameras
[05:20:13] <ReadError_> like in that ted talk
[05:20:46] <ReadError_> http://www.youtube.com/watch?v=w2itwFJCgFQ
[05:21:24] <Mr_Mayhem> Makes tuning a servo seem like kindergarden, hehe
[05:22:27] <Mr_Mayhem> I want one to deliver my pizza. I heard someone is working on it, ha.
[05:26:22] <Mr_Mayhem> All the cool stuff is strongly tied to control theory and related math.
[05:30:12] <Mr_Mayhem> I guess the next stunt is to do it without the motion tracking cameras.
[05:34:14] <jthornton> wow, 15.1 stone this morning
[05:34:37] <Mr_Mayhem> cold?
[05:36:02] <Mr_Mayhem> Neat TED video, thanks, I enjoyed it.
[05:36:16] <jthornton> no, it's 281.4 kelvin atm
[05:36:56] <archivist_herron> a bit anorexic for an american :)
[05:38:34] <jthornton> I'm getting into the minority of not overweight Americans
[05:39:36] <Mr_Mayhem> I used to make ice cream with liquid nitrogen at catering events. I made people fat for a living, hehe. I forget what kelvin -320F is.
[05:40:59] <jthornton> 77.5944444 kelvin
[05:43:10] <Mr_Mayhem> Hehe, he Knows. Fun stuff, I still have dewars in the garage. Maybe useful some day to seat a bearing on a cnc or something.
[05:45:16] <Mr_Mayhem> Or halloween fog, etc.
[05:46:34] <Mr_Mayhem> Its a bit pricey, say 50 cents a liter if you shop around.
[05:47:00] <Mr_Mayhem> Unless you have a big tank for a factory or whatever.
[05:50:56] <Mr_Mayhem> Hey ReadError_ where do you buy G10 material? I just wanted to note it because I am making speaker panels with acrylic and wanted to compare the G10 in a prototype.
[05:51:24] <ReadError_> eplastics now
[05:51:30] <Mr_Mayhem> ok.
[05:51:50] <Mr_Mayhem> I found cheaper, but not for black, only green.
[05:52:47] <Mr_Mayhem> http://www.g10fr4.com/index.htm
[05:53:24] <Mr_Mayhem> Who knows, maybe he can get black too but simply didn't mention it.
[05:53:25] <ReadError_> i get mine for much less
[05:53:35] <ReadError_> 11$ vs 18$
[05:53:43] <ReadError_> on one size for example
[05:53:45] <Mr_Mayhem> Oh, ok.
[05:54:02] <Mr_Mayhem> Cool. I will check them out then.
[05:54:23] <ReadError_> mcmaster sells black and blue also
[05:55:02] <Mr_Mayhem> Is there a difference in quality of the inside color? Some look like they are only black on the outside surface.
[05:55:23] <Mr_Mayhem> But maybe that's the camera or lighting on the cut. I don't know.
[05:56:49] <Mr_Mayhem> Well, thanks. I will have to a cyclone dust trap, and see how it goes.
[06:12:09] <MacGalempsy> just got the touchscreen mounted onto the mill. anyone got a trick to get pvc tubing to seal better with slip couplings?
[06:12:38] <MacGalempsy> got a slight leak that kicks the compressor on about every 10 min
[06:12:57] <jthornton> yes
[06:13:17] <MacGalempsy> will you sharE?
[06:13:48] <jthornton> well the touchscreen is mounted to the mill
[06:14:08] <jthornton> are you talking about push to connect fittings?
[06:14:52] <MacGalempsy> yes in a solinoid valve
[06:14:58] <jthornton> http://ecx.images-amazon.com/images/I/41jo6WimULL._SL500_AA300_.jpg
[06:15:03] <jthornton> like these?
[06:15:25] <MacGalempsy> one looks like that
[06:15:52] <jthornton> cut off a bit of tube to get a fresh place to seal to, if that fails replace the fitting
[06:16:17] <MacGalempsy> thats what I was afraid of. the really leaky one is part of the manifold
[06:16:26] <MacGalempsy> the tubing is new
[06:16:47] <jthornton> as in a all in one manifold with the fittings molded in?
[06:17:21] <MacGalempsy> it looks like it could be component
[06:17:51] <jthornton> some fittings have an internal hex for an allen wrench
[06:18:20] <jthornton> and are completely round on the OD for close spacing on manifolds
[06:18:25] <MacGalempsy> I may just live with it until the rest of the machine is functional
[06:18:51] <MacGalempsy> ah, ok. it snaps to a DIN rail, so it may be pretty easy
[06:24:55] <MacGalempsy> well guys, it was a productive night. have a good day.
[09:40:24] <IchGuckLive> hi all B)
[11:36:27] <IchGuckLive> hi all B)
[11:37:53] <CaptHindsight> ebay 320273430661 seriously? (CNC Control retrofit for Mill Lathe Router Plasma Table Mach3)
[11:37:55] <IchGuckLive> we are getting ready here for the Xmas year show
[11:38:14] <CaptHindsight> what do you do for the show?
[11:38:22] <IchGuckLive> CaptHindsight: crap all over the bay
[11:38:38] <IchGuckLive> its as every year a Starttrrek supper show
[11:38:55] <CaptHindsight> Trekkie xmas?
[11:38:58] <IchGuckLive> i will try to set up a live stream within the next 10minetes
[11:40:15] <IchGuckLive> multistreambox is up and 2 streams are on
[11:44:15] <CaptHindsight> http://www.diacro.com/metal-forming/ anyone have experience/comments on the quality of bends they make?
[11:45:38] <IchGuckLive> http://startrekvorlesung.fh-kl.de/livestream
[11:46:33] <archivist> hehe 320273430661 srsly expensive
[11:46:39] <kengu> CaptHindsight: http://www.ebay.com/itm/320273430661
[11:47:01] <kengu> a bit easier with proper url (:
[11:47:58] <CaptHindsight> we try not to make it too easy for fleabay in here
[11:48:40] <kengu> why we try?
[11:48:52] <Jymmm> No, archivist_herron is just lazy
[11:49:02] <Jymmm> =)
[11:49:29] <Jymmm> Surfin Swans http://www.youtube.com/watch?v=YCat9UXhZpU
[11:52:26] <Mr_Mayhem> what was with the livestream. Dead link now.
[11:52:49] <IchGuckLive> CaptHindsight: i woudt go for a high press so you can automate it by a car pushup cylinder
[12:02:28] <Mr_Mayhem> Oh, needed javascript on. star trek convention in germany. Something different.
[12:03:47] <Mr_Mayhem> a bit choppy here in Vegas.
[12:03:58] <Mr_Mayhem> that livestream.
[12:04:20] <IchGuckLive> im trying to chop all the viewers inside the room
[12:04:30] <IchGuckLive> wait 20sec
[12:04:42] <Mr_Mayhem> ok
[12:04:56] <Mr_Mayhem> Yeah, cuts the congestion.
[12:05:54] <Mr_Mayhem> Usually the treckies are in Vegas, the other way around:-)
[12:06:09] <Mr_Mayhem> Or la
[12:09:39] <Mr_Mayhem> It dropped and is now back up and choppy.
[12:10:43] <Mr_Mayhem> I guess two screens is too much this far away.
[12:19:19] <IchGuckLive> Mr_Mayhem: now it shoudt work only 20 inside the lan and 5k viewers
[12:30:11] <Mr_Mayhem> It played for a bit choppy and died again. The pageload is slow, so maybe just latency to me is the issue, like high ping time. Anyway, I don't want to fill this room with star treck signal reports. Looks like a fun show, though. I never heard folk music like that played by people in star treck uniforms.:-)
[12:40:42] <CaptHindsight> are there any deals on tables suitable for routers ~24" x 36"? (.6m x1m)
[12:42:49] <CaptHindsight> granite surface plates are low cost and flat enough for ~$300
[12:43:12] <cradek> don't forget shipping
[12:43:28] <cradek> anything over 12x18 is not UPSable
[12:44:03] <cradek> and as appealing as the idea is, you don't really have a good way to hold the work to it
[12:44:24] <cradek> I'll use a small one for my engraving robot (if I ever finish it) because I hold the work with double sided tape
[12:45:19] <CaptHindsight> Enco trucks them to me for ~$60
[12:47:16] <CaptHindsight> a nice ground t-slot plate source would be nice
[12:56:23] <CaptHindsight> http://www.ebay.com/itm/280801860523 they don't spec flatness (aluminum Vacuum table)
[12:58:35] <CaptHindsight> same for the PVC variety http://www.ebay.com/itm/280698609700
[13:01:58] <IchGuckLive> Mr_Mayhem: is it now ok to you NY NJ is fine
[16:02:36] <CaptHindsight> http://chicago.craigslist.org/wcl/mat/4247171655.html 5052 Aluminum Sheets .25" x 5'x 10' - $250
[16:16:17] <Spida> JT-Shop: Missouri seems to be a bit far away... *cough*
[16:16:26] <Spida> JT-Shop: thanks for the offer, though...
[16:17:39] <Deejay> gn8
[16:42:49] <JT-Shop> lol
[16:44:24] <mozmck> CaptHindsight: nice, but I'm building a ragwing.
[16:44:32] <andypugh> Want! http://youtu.be/-vVblGlIMgw
[16:45:11] <mozmck> CaptHindsight: oh wait, I read that as .025"
[16:58:41] <CaptHindsight> mozmck: yes, plate vs sheet
[17:02:41] <CaptHindsight> http://www.ebay.com/itm/181283823492 nice base for a router/plasma cutter etc
[17:12:29] <andypugh> He claims it is 1" thick cast iron. I think he is wrong.
[17:13:49] <CaptHindsight> the feet look 1" thick
[17:14:10] <CaptHindsight> the rest maybe 3/8-1/2 in some parts
[17:14:43] <andypugh> I also think that it is rolled steel throughout too.
[17:14:55] <CaptHindsight> yeah, vs iron
[17:15:31] <CaptHindsight> well you know how those folks from Missouri are :)
[17:20:13] <JT-Shop> I learned not to trust anyone from Missouri till you were sure they were out to screw you!
[17:21:08] <JT-Shop> he probably don't know the difference between structural steel and cast iron... looks like a farmer
[17:22:05] <JT-Shop> the only thing missing is the top LOL
[17:24:14] <CaptHindsight> I'd like to find something like that closer to my neck of the woods, but it looks like I'll have to get the welder and band saw out
[17:53:40] <tjb1> Does anyone here take mill work?
[17:53:47] <tjb1> I need a simple piece made out of aluminum
[17:53:56] <tjb1> will fit in 1"x1"x.5" square
[17:55:26] <Tom_itx> nothing a file couldn't do
[17:55:35] <ries> totally OT, if I release software... GPLv3 or more like a BSD type license?
[17:55:41] <andypugh> Or a cold chisel + skill :-)
[17:56:19] <tjb1> Tom_itx: Will fit in that, it has quite a few holes in it
[17:56:22] <tjb1> and threads
[17:56:30] <andypugh> ries: I think we have settled on GPL 2+ for LinuxCNC, but I don't claim to understand it all.
[17:56:58] <Tom_itx> gotta go find a scrap so i can test these engraving bits out
[17:57:14] <Tom_itx> andypugh, what did you suggest for a depth on those? i can't recall
[17:57:22] <Tom_itx> .010" or so?
[17:57:44] <andypugh> I used 0.1mm
[17:57:47] <ries> andypugh: For me it never bugged me BSD vs GPLvX but I want to start releasing my little g-code view/generator tool and wonder what license I should pick... not easy :s
[17:59:08] <Tom_itx> that's only about .003" right?
[17:59:09] <mozmck> ries: BSD allows others to take your code, modify it and release a commercial product based on it without giving their changes back. GPL forces them to give changes back to the community.
[17:59:12] <Tom_itx> not very much at all
[18:00:20] <ries> mozmck: my recent exprience with libreCAD seems to indicate that even if it's GPL there is nothing what I can do for people to fork, re-copyright it and sell. LibreCAD is found in the appstore and Apple isn't taking it down :s so I cinda wondering what would be the best for the project... if somebody is interested :D
[18:01:19] <mozmck> I think the re-copyright would be problematic, but you can always fork and sell a GPL project.
[18:01:51] <ries> they are just bluntly selling it with a re-copyright without giving the source
[18:02:12] <ries> I am just now wondering what's better project whise
[18:02:56] <mozmck> Interesting. I think there is a group that will take them to task for that if you let them know, but I don't remember who.
[18:04:20] <mozmck> I would think it would just depend on your goals/ideals.
[18:07:05] <ries> Hopefully next week...I wrote it in java so they can't sell it on the App store anyways :D (as far as I know....)
[18:09:30] <jdh> tjb1: what is your part?
[18:09:32] <Spida> tjb1: would probably be helpful to know on which continent your are located if you want the fnished part sent to you...
[18:11:12] <tjb1> NY, USA and yes
[18:13:02] <tjb1> jdh: It would be this http://files.e3d-online.com/Drawings/E3D_Heat_Block.jpg that is around 30mm long instead of 16
[18:13:16] <tjb1> If you can do it I would of course have a real print and not chat talk or napkin sketches ;)
[18:18:09] <Tom_itx> i've done some pretty good work via chat talk :)
[18:18:39] <Tom_itx> i know what that is ( i think )
[18:18:56] <Tom_itx> friggin reprap parts
[18:19:57] <tjb1> im switching to thermocouple and need a place to stick it
[18:20:22] <Tom_itx> considered a PT100?
[18:21:31] <tjb1> That works the same as a thermistor?
[18:21:49] <Tom_itx> it's quite linear
[18:21:59] <Tom_itx> i use one on my toaster oven
[18:22:08] <andypugh> Thermocouples are just two bits of wire. They don't need any space at all to exist in.
[18:22:12] <tjb1> But it works in the same way
[18:22:47] <Tom_itx> yeah but they need an op amp to boost the signal
[18:22:56] <tjb1> Hmm
[18:23:05] <andypugh> Technically the thermocouple is the electrical connection between the two bits of wire, in fact.
[18:23:16] <Tom_itx> i used the internal 1.1v reference on mine and hooked it straight to an adc input
[18:23:26] <tjb1> Yes andypugh, but its much easier to screw one in and go to town
[18:23:57] <Tom_itx> http://tom-itx.dyndns.org:81/~webpage/toaster_oven/PT100_a.jpg
[18:24:02] <Tom_itx> they're quite small
[18:24:04] <andypugh> I used to just spot-weld two bits of wire to the surface of my specimens.
[18:27:50] <andypugh> You can get them down to tiny sizes as a packaged item, if you prefer. http://uk.rs-online.com/web/p/thermocouples/7877822/
[18:28:02] <Tom_itx> how did you calibrate it?
[18:28:13] <andypugh> Me?
[18:28:22] <Tom_itx> yeah
[18:28:40] <andypugh> I used commercial thermocouple wire. So the standard amps "Just Worked"
[18:30:33] <Tom_itx> http://www.ebay.com/itm/New-PT100-Stainless-Steel-Thermocouple-Temperature-Sensor-Probe-2m-Cable-3-fork-/360613245965?pt=LH_DefaultDomain_0&hash=item53f639740d
[18:30:49] <Tom_itx> those are too big for your application though
[18:31:10] <andypugh> The spot-weld was an electrical connection, so both wires were at the same potential at that point. They were at the same temperature, as they were in intimate contact. At the other end of the wire they were at the same temperature too, so the thermoelectric effect meant that they were at different potentials at the other end.
[18:31:59] <andypugh> The thermocouple "magic" isn't in the connection, it is in the wires.
[18:32:19] <Tom_itx> dissimilar metals
[18:32:31] <andypugh> Actually, copper is a reasonable thermocouple wire.
[18:33:11] <andypugh> (It is used as one half of some couples)
[18:34:08] <andypugh> Any wire that is hot at one end and cold at the other will have a different voltage at each end. The tricky part is measuring it, because the same is true of the measuring wire.
[18:34:38] <andypugh> I guess that the perfect thermocouple wire would be something with absolutely zero thermoelectric effect.
[19:04:59] <andypugh> Time to sleep.
[19:46:30] <Tom_itx> JT-Shop you still around?
[19:47:30] <Tom_itx> your face program defaults to the left rear?
[19:47:40] <Tom_itx> you didn't give me an option?
[20:09:11] <Tom_itx> how can you reverse the MPG direction on one axis?