#emc | Logs for 2009-12-19

[00:22:59] <ChanServ> [#emc] "This is the #emc channel - talk related to the Enhanced Machine Controller and general machining. Website: http://www.linuxcnc.org/, wiki at http://wiki.linuxcnc.org/"
[00:49:13] <lilalinux> lilalinux is now known as lilalinux_away
[00:52:11] <Hal_9_k> Does 2.6.24-16-rtai support dual cores? htop is showing one core on my atom.
[01:01:08] <andypugh> Ha_9_k: No, there is no dual core support on the default installation. It is possible to compile an SMP-enabled RTAI kernel, but it takes work.
[01:19:46] <ds3> has anyone tried sheetcam as a g-code generator for EMC?
[02:59:06] <Dave911_> Dave911_ is now known as Dave911
[03:12:47] <Jymmm> If I wanted a lot of round discs (apx 3/4" to 1.5" diameter, 1/2" thick or so), better to cut them out of plate, or slice off of rod and then surface both sides flat?
[03:14:19] <jmkasunich> that depends on what machine(s) you have, and what your requirements are (such as precise roundness, precise thickness, etc)
[03:15:44] <Jymmm> I dont have jack, nor even a saw to cut the rod. accuracy isn't significant, more esthetic as long I can reproduce a replacement disc years later.
[03:16:35] <jmkasunich> what material? steel, alum, wood, plastic?
[03:17:10] <jmkasunich> if you don't have any machinery, then you are asking a pointless question
[03:17:12] <Jymmm> jmkasunich: Sorry, I dont know how to gauge precision. Would be brass, maybe a slight chance of aluminum
[03:17:27] <Jymmm> jmkasunich: I can buy equipment
[03:17:43] <jmkasunich> how many? just a couple, or bunches?
[03:18:13] <Jymmm> jmkasunich: ititially 20, then if it goes well hundreds per year
[03:18:41] <jmkasunich> solid brass 1/2" thick is not going to be cheap - cutting slices from rod would be much less wastefull
[03:19:33] <Jymmm> Is there a way to "slice" brass rod so that it wouldn't need to be surfaced at all?
[03:19:56] <MattyMatt> parting tool on a lathe?
[03:20:16] <Jymmm> seems wasteful
[03:20:38] <jmkasunich> Jymmm: the standard way to cut bar is a bandsaw, but that will give you a saw-cut surface
[03:20:44] <jmkasunich> unlikely to be what you want
[03:21:10] <Jymmm> correct. Didn't know if a waterjet or the like would be better
[03:21:25] <jmkasunich> (but you haven't said much about what you want... there is a huge range from rough-cut saw, to rough faced, to fine faced, to polished
[03:22:03] <Jymmm> jmkasunich: the same surface if you were to buy 1/4" alumin plate from anywhere is more than smooth enough.
[03:22:24] <Jymmm> it's mostly asthetics
[03:22:24] <jmkasunich> oh - so pretty crappy then
[03:22:45] <jmkasunich> smoother than saw cut, but not at all shiny
[03:23:17] <Jymmm> jmkasunich: Well, brass can be polished up, can't it not?
[03:23:17] <MattyMatt> my biggest problem cutting brass round with a hacksaw was marking it
[03:23:18] <jmkasunich> does that finish apply to only the faces, only the OD, or both?
[03:23:36] <jmkasunich> Jymmm: you can't polish out dents and scratches
[03:23:36] <Jymmm> jmkasunich: all faces
[03:24:05] <jmkasunich> for comparison purposes:
[03:24:27] <jmkasunich> metal express, 360 brass, 30" x 1.5" x 1/2" thick flat - $64
[03:24:35] <Jymmm> jmkasunich: Have you seen those model brass steam engines? Kinda like that.
[03:24:48] <jmkasunich> that would be enough for 20 circles 1.5" diameter, assuming no kerf loss
[03:24:50] <Jymmm> it's just for looks.
[03:25:24] <ds3> what about shearing slices off bar stock?
[03:25:25] <jmkasunich> metal express: 360 brass, 1/2" long slices off a 1.5" diameter bar, 30 pieces = $64
[03:25:46] <Jymmm> link?
[03:25:56] <jmkasunich> metal express: 360 brass, a single piece of 1.5" bar long enough for you to make 20 slices, $39
[03:26:02] <jmkasunich> www.metalexpress.net
[03:26:28] <jmkasunich> then navigate to products, brass, pick your alloy and shape (360 is the most common and probably cheapest alloy), then select size, length, and qty
[03:26:39] <Jymmm> got it
[03:27:31] <Jymmm> Shit, that beats me doing it. Except for the polishing like this... http://www.daledetrich.com/brass_model_t.htm
[03:27:35] <MattyMatt> wide fine file will take out saw marks that emery paper can't handle
[03:27:38] <Jymmm> thanks jmkasunich
[03:27:43] <Jymmm> bbiab
[03:28:08] <jmkasunich> Jymmm: there is a hell of a lot of work between a slice off a bar, and those shiny parts in that photo
[03:29:55] <jmkasunich> IMHO, if you want a surface to be "pretty", you need to plan on machining it - the raw OD of a bar will be tarnished, and may have dents and scratches in it
[04:11:07] <Jymmm> jmkasunich: You know, you're right. I totally didn't think about raw bar stock condition.
[04:11:51] <Jymmm> jmkasunich: But, what is the typical process for brass to go from a surfaced face, to mirror finish?
[04:12:21] <cradek> depends whether you want it shiny or flat and shiny
[04:12:40] <cradek> shiny is easy - use a buffer
[04:12:40] <Jymmm> mirror, as in see your reflection in it
[04:13:25] <Jymmm> not like "brushed" finish.
[04:14:03] <Jymmm> would it just be easier to grab some steel and get it chrome plated?
[04:14:18] <cradek> plating doesn't make a part smooth
[04:14:47] <Jymmm> so the plating wouldn't' fill the toolmarks?
[04:14:53] <cradek> nope
[04:14:54] <Jymmm> surfacing toolmarks
[04:15:05] <Jymmm> not bandsaw toolmarks
[04:15:24] <cradek> you have to do the same finish work whether or not you plate it
[04:16:02] <cradek> plating shops have huge buffers and they can do it for you - but that makes shiny, not flat and shiny
[04:16:12] <Jymmm> ok.
[04:17:01] <Jymmm> toss out this idea for a while =)
[04:17:26] <Jymmm> * Jymmm wipes the slate clean. NEXT!
[04:17:34] <Jymmm> thanks guys
[07:57:41] <MattyMatt> http://www.newscaletech.com/squiggle_overview.html
[07:58:46] <MattyMatt> $125 each not too bad
[08:00:10] <MattyMatt> 2 per finger and 3 per thumb, about $1500 per hand, but they'd be monkey sized
[10:09:20] <yoyoek1> hi
[10:10:26] <micges> hi
[10:12:01] <yoyoek1> on linuxcnc.org on server is working some svn service ?
[10:17:27] <micges> I don't think so
[10:17:29] <micges> why?
[10:19:21] <yoyoek1> I have a project and I whant to make it publick but I don't have any svn (public svn) acount
[10:19:54] <micges> try on www.sf.net
[10:20:44] <micges> you must register and you can add projects under many version controllers (git, svn, cvs)
[10:25:25] <micges> gui
[10:26:26] <yoyoek1> micges: you use some soft to make tool path in gcode with tool dimension correction in 2dcam ?
[10:26:46] <yoyoek1> micges: or you draw a drawing with that corrected path ?
[10:28:01] <micges> for now to use cutter width comensation I must correct drawings in cad
[10:28:23] <yoyoek1> somthing like http://yoyo.ghost.pl/fb/?&tag=nowe&id=1169&subPage=detale
[10:28:29] <micges> but I preparing to use emc new code to do that for me
[10:29:24] <yoyoek1> emc code ? there is a posibility ? emc don't know where is a furcace of a object. it only get a eadges
[10:30:25] <micges> yes emc has that function in interpreter
[10:31:33] <micges> but it not that simple to use like fixing drawings
[10:32:20] <micges> yoyoek1: http://www.linuxcnc.org/docview/devel/html//gcode_main.html#sec:G41,-G42
[10:33:38] <yoyoek1> micges: I'm working from about two weaks now on it but for my mGcodeGenerator
[10:34:20] <micges> yoyoek1: emc2 interp have all information to make dynamic cutter radius compensation based only on gcode
[10:34:50] <yoyoek1> where can I found some info how to use it ?
[10:35:58] <micges> i've sended you link
[10:39:10] <micges> yoyoek1: http://www.linuxcnc.org/docview/devel/html//gcode_tool_compensation.html#sec:Cutter-Radius-Compensation
[10:42:11] <lilalinux_away> lilalinux_away is now known as lilalinux
[10:44:45] <yoyoek1> gcode is magic
[10:53:35] <micges> bbl
[10:54:57] <EbiDK|AWAY> * EbiDK|AWAY likes urban dictionary word of the day today :) http://www.urbandictionary.com/define.php?term=Cashmas&defid=2736051
[11:12:37] <Dave911> frallzor: I'm really sorry to hear about your Mom's passing... hang in there...
[11:21:35] <Dave911> Jymmm: Brass disks - sounds like a natural for a CNC lathe with sharp tooling.. machine all the surfaces of the disks and then buff them yourself or have someone finish them for you. A CNC lathe with a bar feeder and the right tooling could whip those out in no time! :-) Look into vibratory polishing. Or contact a plating shop and tell them what you want. Metal finishing is a...
[11:21:36] <Dave911> ...science unto itself.
[11:28:33] <Jymmm> Dave911: I'm just gonna pay jmkasunich $0.10/ea for them. I'm sure I can get him drunk enough to go for it
[11:29:41] <Dave911> Beer/liquor is cheap compare with brass ;-)
[11:29:56] <Jymmm> I'm thinking moonshine
[11:30:12] <Dave911> Not the good stuff ......
[11:30:46] <Jymmm> No, it's gonna have to be the good stuff. if not, he might go blind
[11:31:01] <Dave911> Details ..... geez ...
[11:31:38] <Dave911> Remember ethanol.... not methonal... ;-)
[11:31:39] <Jymmm> Eh, whatcha gonna do *shrug*
[11:32:39] <Jymmm> (Food grade alcohol - on the controlled substance list)
[11:33:29] <Dave911> When E85 gasoline came out I had to wonder how many moonshiners weren't trying to figure a way how to separate the gas from the ethanol ..... :-)
[11:33:31] <lilalinux> lilalinux is now known as lilalinux_away
[11:34:11] <Dave911> >>Food grade alcohol - on the controlled substance list << for the purpose to collecting taxes .....
[11:34:33] <Dave911> meant: for the purpose of collecting taxes ......
[11:35:19] <Jymmm> All I know is it's limited access and $60/gal in smaller qty's
[11:35:36] <Jymmm> and nobody has it locally - I just need a gallon
[11:36:07] <Jymmm> Well, I know one place to get it at a winery I used to work at.
[11:36:09] <Dave911> I do a lot of work with a distillery - a real legal one. I think they pay about $10/ gallon in taxes to the feds... They make about 100K gallons per day .. how would you like that tax bill!
[11:36:59] <Dave911> Vodka is basically straight grain alcohol..
[11:37:15] <Jymmm> For as much as this lil winery makes, sure I'll pay it =)
[11:39:29] <Jymmm> i just have no idea on the water content in vodka
[11:40:12] <Dave911> Well I guess most people can't consume that much alcohol anyway so $10/gallon is tolerable..
[11:41:00] <Dave911> I bet the alcohol tax is Russia is pretty low as their per capita consumption is way up there ..
[11:43:42] <Jymmm> heh
[11:48:39] <micges> yoyoek1: if you have question about G41/G42 just ask
[11:57:20] <yoyoek1> micges: information about existing G41/G42 distroid all my work :/
[11:58:02] <yoyoek1> micges: if there is somthing like in/out tool commpensation i gcode I shoud finish my exporter at the eavning
[11:58:34] <yoyoek1> micges: and there is a commpensation o.O all my work for nothing :/
[12:00:09] <micges> not nessesary, with your exporter user don't have to mess up with gcode
[12:00:25] <micges> this is huge advantage for many users
[12:01:16] <yoyoek1> micges: yes but prepering object is allsow time consumming
[12:01:54] <yoyoek1> micges: I'm gona modiffy my exporter to generait strait to gcode G41/G42/G40
[12:02:37] <micges> that would be the best think
[12:02:48] <micges> I think
[12:03:26] <yoyoek1> micges: simpliest idea. in blender you have somthing like layers :) layer 1 - g40 ; layer 2 - g41; .....
[12:04:05] <dimas> Dave911, it is about $1.3-1.6 of alcohol tax for 0.5 litre bottle of vodka
[12:04:33] <dimas> * dimas consumes it too little to know better..
[12:07:05] <archivist_> archivist_ is now known as archivist_emc
[12:31:31] <lilalinux_away> lilalinux_away is now known as lilalinux
[13:54:55] <Valen> anybody know what post processor to use from rhinocam for emc2?
[13:56:08] <Valen> or from say mechsoft?
[13:59:59] <Valen> heres what I'm hoping to make
[14:00:00] <Valen> http://www.vapourforge.com/mill/finished%20product.png
[14:31:53] <oPless> whats that then?
[14:32:01] <oPless> some kind of knife ?
[15:47:49] <Dave911_> Dave911_ is now known as Dave911
[16:15:06] <Valen> oPless eventually
[16:15:13] <Valen> using an existing blade
[16:17:10] <oPless> Valen, that's cool.
[16:17:19] <Valen> missus xmas present
[16:17:39] <Valen> her grandads carving knife set, the handles got ruined on them
[16:18:47] <Valen> so going to make a new one out of a block of stainless
[16:54:01] <Dave911_> Dave911_ is now known as Dave911
[17:25:45] <frallzor> hoy hoy
[18:05:31] <tom3p> yoyoek1: what is the material? http://yoyo.ghost.pl/fb/?subPage=detale&tag=nowe&id=1155 (very nice work as usual)
[18:07:46] <yoyoek1> tom3p: it is fiberglas plate 2mm tin
[18:07:49] <yoyoek1> thin
[18:08:45] <frallzor> something RC-related?
[18:09:22] <yoyoek1> frallzor: yes it is a conversion part for rc helicopter for main rotor blade grip
[18:10:51] <MattyMatt> has your mySQL just crashed?
[18:11:03] <frallzor> MattyMatt dont just click
[18:11:12] <frallzor> it added a few odd symbols for some reason then
[18:11:17] <frallzor> like the 3-4 last ones
[18:11:22] <yoyoek1> http://yoyo.ghost.pl/fb/?subPage=detale&tag=nowe&id=1155&&
[18:14:28] <MattyMatt> and now it works without the &&. strange
[18:15:35] <yoyoek1> two days from now I made firt work in wood :) http://yoyo.ghost.pl/fb/?subPage=na_tapecie&tag=podstawa%20silnika
[18:15:49] <MattyMatt> that fibreglass plate & pcb must use a different resin than normal GRP, so it can be milled
[18:16:35] <yoyoek1> FG it is myn main work material
[18:17:47] <MattyMatt> I removed the front of my full-face motorbike helmet with a hacksaw and file. everyone told me it was illegal and unsafe but I'd nearly died from sneezing so I didn't care
[18:19:43] <MattyMatt> much longer fibres to shatter in a helmet I think
[18:24:42] <MattyMatt> is that balsa ply?
[18:25:16] <yoyoek1> plywood
[18:25:51] <yoyoek1> plywood. very thin. three layers of wood. between adhesive
[18:26:45] <yoyoek1> This is called the house. This is for attaching an electric motor in a remote-controlled models
[18:27:14] <MattyMatt> the dehaveland mosquito was made by ironing veneers onto a concrete form. that's the only balsa ply I've heard about
[18:28:26] <MattyMatt> one day I'll do that in a scale model :) when I'm retired or rich enough for hobbies
[18:28:38] <frallzor> http://pici.se/gal/oddname/Mill/ new lovely pics in my album now :P
[18:28:40] <frallzor> enjoy!
[18:28:59] <frallzor> porn for the interested in the insides of electronics
[18:30:15] <MattyMatt> where are you up to on the Mate? what's holding you up?
[18:30:47] <frallzor> well, need to order some stuff for the "running of steppers"
[18:30:59] <frallzor> dont know the english term atm
[18:31:07] <MattyMatt> drivers
[18:31:08] <frallzor> "cogs" =P
[18:31:17] <MattyMatt> aha
[18:31:23] <frallzor> rack and pinions
[18:31:27] <frallzor> there we go
[18:32:12] <frallzor> but first, clean garage, move the build home
[18:34:24] <MattyMatt> I've got lots of good friends on IRC, but it doesn't help when you need a team of shifters :p
[18:42:32] <ries> frallzor: where are you going to racks + pinions from? and, did you already decide teh steppers (I though motion king but....)
[18:46:31] <frallzor> same ppl that let me use their workshop can fix
[18:46:38] <frallzor> = cheap =)
[18:47:01] <frallzor> im going for the geared ones I think
[18:47:09] <frallzor> oriental
[19:30:28] <ries> frallzor: other people use them, I think you should be fine with that
[19:31:04] <frallzor> some time until I can get the rest of the electronics though
[19:34:23] <ries> I am currently missing my gauge plate :s
[19:34:37] <ries> some company here they said they would have it for around 25USD
[19:34:53] <ries> then, when we did see the plate we got it was a bit of a laugh... it was all twisted!!!
[19:35:05] <frallzor> nice
[19:35:55] <ries> There guillotine wasn't good.. se we did knew enough...
[19:36:20] <ries> properly we will buy a 8mm plate and then rectify it out selve
[19:39:23] <frallzor> =)
[19:41:57] <yoyoek1> siet feels like-18.9C o.O
[19:42:24] <yoyoek1> nie ma to jak rozgrzewka przed zim0105
[19:42:34] <yoyoek1> there's nothing like a warm-up before winter
[19:44:17] <yoyoek1> as it is now so cold that I do not want to know what will happen in February.
[19:46:07] <yoyoek1> efekt cieplarniany, a 015bwinie lataj0105
[19:46:17] <yoyoek1> The greenhouse effect, and pigs fly
[20:36:12] <archivist_emc> a UK hardinge on the loose fleabay 170421691815
[20:37:30] <frallzor> nice one
[20:37:50] <frallzor> too bad one dont live in the UK
[20:38:19] <archivist_emc> I do but am skint
[20:38:23] <frallzor> sometimes I wish i hade joined the military as a truckdriver =P
[20:38:42] <frallzor> then I could borrow a truck and pick the bloody thing up after a long roadtrid
[20:38:43] <frallzor> *p
[21:06:31] <micges> yoyoek1: wlasnie wrocilem, jest jakies -18C
[21:07:28] <micges> yoyoek1: link for your pages don't work
[21:21:09] <anxova> is it possible to install emc in a ubuntu system without rtai?
[21:23:57] <micges> anxova: yes
[21:24:06] <micges> only is simulation mode
[21:24:39] <anxova> that's what i want. how i must proceed?
[21:25:40] <micges> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Installing_EMC2#On_Ubuntu_6_06_or_8_04_from_source
[21:26:38] <micges> there are instructions to get source code and compile it in simulator
[21:27:09] <anxova> ok, thanks micges
[21:28:32] <anxova> but is mandatory to use ubuntu 8.06? can i use it on ubuntu 9.10 version?
[21:29:02] <micges> yes
[21:29:57] <anxova> yes on what? first or second question?
[21:30:19] <micges> you can use 9.10
[21:30:29] <micges> must manually inastall dependencies
[21:30:44] <anxova> aha, and is so complicated?
[21:31:03] <micges> no complicated, annoying
[21:32:13] <micges> all missing dependencies are displayed during ./configure --enable-simulator
[21:32:53] <anxova> ok, thanks a lot
[21:34:30] <anxova> and just one last question. is it possible in emc2 to show a solid piece and see the path of the tool?
[21:35:50] <micges> you mean 3d simulation of details after program?
[21:37:17] <micges> what do you mean 'solid piece'?
[21:38:21] <anxova> well, like a cube and see how it's drilled etc.
[21:40:50] <micges> anxova: there is path simulation, 3d simulation using tool radius and solid part model is in developing stage
[21:41:42] <anxova> aha, thanks a lot for these answers micges
[21:42:09] <micges> welcome
[21:42:22] <archivist_emc> simulating the part being cut wont be easy to do
[21:42:54] <micges> archivist_emc: jepler have some progress on this
[21:43:10] <micges> but I don't know details
[21:43:59] <archivist_emc> I have tried his program a while ago
[21:44:29] <archivist_emc> we did squash a bug but there is more to do
[21:45:07] <micges> few days ago he show some progress on emc-devel
[21:45:20] <archivist_emc> ah nice
[21:59:58] <micges> archivist_emc: it seems that you tested program in the same time I saw it ;)
[22:00:14] <micges> (weak memory...)
[22:13:54] <micges> archivist_emc: as for taper on lathe, I have found person who in this week demonstrate me some cool stuff on real lathe, I hope to learn as much
[22:13:57] <micges> I can
[22:14:22] <micges> after that I can asking :)
[23:27:51] <anxova> i'm trying to compile emc2 in ubuntu 9.10, but when i do ./compile i get this "Required OpenGL header missing. Install it, or specify --disable-python to skip the parts of emc2 that depend on Python" but i don't know what package to install. some idea?
[23:29:05] <jthornton> anxova: http://neo-technical.wikispaces.com/emc2-ubuntu
[23:49:48] <anxova> thanks jthornton
[23:50:57] <LawrenceG> Jymmm, http://imagebin.ca/view/epbv1Q.html 4" letters carved by emc2