#linuxcnc | Logs for 2013-03-09

[00:47:35] <tripod|> hi there
[00:48:36] <tripod|> anyone here, who can tell me, how i can setup something like this in linuxcnc? https://www.youtube.com/watch?v=FgnxBaFFDi8
[02:13:22] <DJ9DJ> moin
[03:14:07] <IceKiller> hey guys anyone know how much current (voltage) i need to give these steppers : http://www.wantmotor.com/ProductsView.asp?id=160&pid=80
[03:14:13] <IceKiller> WT57STH115-3004A 57BYGH115-003
[03:16:21] <DJ9DJ> rated current: 3A
[03:16:28] <DJ9DJ> according to the table
[03:17:05] <archivist> IceKiller, the voltages stated can be ignored when using a proper driver, what matters is the current and as high a voltage as your drivers can handle safely
[03:17:44] <archivist> many are running their motors at 30+ volts
[03:18:17] * DJ9DJ uses 48 volt :)
[03:20:12] <archivist> mine are on a 24 volt supply turned up as far as it will go...about 29
[03:25:30] <IceKiller> hmm ok
[03:25:34] <IceKiller> i'll probably go for 35-40v than :)
[03:26:05] <Jymmm> Usually 20-25 times the rated voltage
[03:26:24] <Jymmm> or so I've seen.
[03:27:33] <Jymmm> http://www.geckodrive.com/support.html
[03:28:54] <Jymmm> "...At this point it is important to introduce the concept of overdrive ration. This is the ration between the power supply voltage and the motor’s rated voltage. An empirically derived maximum is 25:1, meaning the power supply voltage should never exceed 25 times the motor’s rated voltage or 32 times the square root of motor inductance..."
[03:30:43] <mrsun> there is a calculation for highest voltage to use to a given inductance of the motor
[03:31:44] <Jymmm> mrsun: Uh..... "32 times the square root of motor inductance"
[03:32:05] <mrsun> something like that and i would go for something like that
[03:32:11] <Jymmm> lol
[03:32:18] <mrsun> as you would saturate the magnetic field fast as hell with higher voltage =)
[03:32:27] * Jymmm pats mrsun on the head and hands him a cookie!
[03:32:34] <mrsun> gives about 40V or so for my motors
[03:40:01] <Jymmm> Bah, I can't remember... There's an encoding scheme that only changes one bit at a time to go to the next in sequence. Anyone recall what it is? I think even some encoders or "wheels" (?) use?
[03:42:49] <Jymmm> Ah, grey code
[03:50:47] <DJ9DJ> indeed
[03:53:25] <Jymmm> DJ9DJ: Heh, I couldn't "see it" initially, but I see the pattern now! WOO HOO
[03:55:50] <Loetmichel> Jymmm: isnt that gray code?
[03:56:24] <Jymmm> Loetmichel: Why, yes, yes it it! Thank you =) 013-03-09 01:29:40 Jymmm: Ah, grey code
[03:56:59] <Loetmichel> i meant the spelling
[03:57:33] <Jymmm> eh
[03:57:38] <DJ9DJ> hrhr
[03:57:51] <Jymmm> Loetmichel: Goony goo goo
[03:58:49] <Loetmichel> ?
[07:33:34] <IceKiller> anyone here have second hand ballscrews/bk12/bf12 for sale? (410mm & 150mm)
[07:38:55] * archivist rapidly hides his unused ballscrews
[08:40:07] <r00t4rd3d> you can get ballscrews off ebay cheap
[08:40:14] <r00t4rd3d> just gotta wait on chinaman
[09:37:06] <IceKiller> anyone have any experience with servo motors? DC servo motor type: l511t-019el7 from sanyo?
[09:39:02] <Jymmm> IceKiller: Just ask your question. If someone can help, they will.
[09:42:13] <IceKiller> well basicly the servo motors and drivers etc are probably from some kind of plotter, it works @ dos (lectra orsomething)
[09:42:23] <IceKiller> but my friend whats to use it with mach3
[09:52:13] <archivist> mach3 and servo!!!! joking
[09:53:01] <JT-Shop> LOL mark3 and servos
[09:54:06] <archivist> JT-Shop, is your fergy deseasal or some other fuel
[09:55:31] <JT-Shop> my fergy has a contentinal gas engine, it is the same tractor as the MF 150 or something like that and made for the Fergy dealers so they had somethign to sell that was the same in performance
[09:56:55] <archivist> I came across some distributor info for the petrol and other fuels
[09:58:11] <JT-Shop> for a F40 Ferguson?
[09:58:28] <archivist> I am currently cataloguing Lucas information
[09:59:07] <archivist> older models I think TE 20
[09:59:37] <JT-Shop> ah, yea that is an earlier model made both here and over your way
[09:59:53] <JT-Shop> over her it is a T0 20
[10:02:35] <JT-Shop> here
[10:03:15] <archivist> 1948-51 covers models TE 20, A, D, H
[10:03:53] <JT-Shop> mine is 1956
[10:04:22] <archivist> a youngsta
[10:10:03] <JT-Shop> aye, younger than me lol
[10:10:17] <archivist> and me :)
[10:21:49] <Jymmm> O_o
[11:01:16] <gmag> Hi, need some help understanding G40, any tips?
[11:02:15] <JT-Shop> that's a dead simple one it turns off compensation
[11:02:37] <gmag> JT-Shop, :-( dunno what compensation is
[11:02:56] <JT-Shop> what did you think G40 was?
[11:03:05] <JT-Shop> http://www.linuxcnc.org/docs/html/gcode/tool_compensation.html#sec:cutter-compensation
[11:07:30] <gmag> I had no idea what G40 meant cause I didnt know what compensation was about. But that link clarifies things
[11:07:33] <gmag> cheers mate
[11:07:51] <gmag> I think you have a tutorial you made about G code, could you share the link?
[11:08:23] <gmag> @JT-Shop
[11:11:29] <JT-Shop> http://gnipsel.com/linuxcnc/index.html
[11:11:34] <JT-Shop> enjoy
[11:14:18] <gmag> cheers mate
[12:09:37] <IchGuckLive> hi all B)
[12:14:36] <gmag> hi
[12:15:49] <IchGuckLive> B)
[12:30:57] <IchGuckLive> today a bood miliong no break of tool
[12:52:24] <IchGuckLive> not many talking today so i go by for today !!
[13:01:13] <skunkworks> https://www.youtube.com/watch?v=-QGPNurG9VE
[13:07:02] <mrsun> hmm tips on removing brazing flux residue? :)
[13:08:02] <archivist> elbow grease
[13:08:08] <Loetmichel> mrsun: depends on the flux
[13:08:13] <mrsun> oh :/
[13:08:17] <mrsun> its hard as glass
[13:08:24] <Loetmichel> sometimes dilutedNaOh is good
[13:08:57] <skunkworks> salt solution worked for me..
[13:09:09] <skunkworks> heated
[13:09:11] <mrsun> brazed my gears for the lathe today =) hope it will work good ! =)
[13:09:20] <mrsun> so boil it in salt water? :P
[13:09:22] <skunkworks> wait - salt and vinager? That was it...
[13:09:55] <Loetmichel> skunkworks: nice. but the motor seems to be a bit powerless...
[13:11:41] <skunkworks> mrsun: yes - worked very well - supposed to just under boil
[13:12:10] <mrsun> wont eat away on the steel then ? :)
[13:13:09] <skunkworks> mrsun: http://www.ehow.com/how_7901829_remove-silver-solder-flux.html
[13:14:31] <skunkworks> it doesn't take very long.. (I was very surprised at how well it worked)
[13:16:30] <roycroft> i pickel with a sodium bisulfate solution in a crock pot
[13:16:40] <roycroft> sodium bisulfate is readily available at a pool/spa center
[13:16:50] <mrsun> hhmm looks like my bull gear have been turned the wrong way on the lathe ... hmm
[13:16:59] <roycroft> something i learned in my jewelerymaking class
[13:20:58] <mrsun> hmm
[14:58:03] <r00t4rd3d> ReadError, how many slots did you get cut before you had a melt down?
[15:01:46] <ReadError> 1.5
[15:01:52] <ReadError> i used the bigger one
[15:01:56] <ReadError> it did fine though
[15:16:39] <r00t4rd3d> so I should do 1 at a time and allow for cool down :)
[15:16:49] <r00t4rd3d> how long was your 1st one?
[15:17:16] <r00t4rd3d> I am probably going to use mdf also which will be easier to cut
[15:17:58] <r00t4rd3d> slot it then put some minwax wood hardener on it
[15:34:44] <tripod|> anyone here, who can explain me, how to setup a tripod?
[15:51:27] <Tom_itx> ask the dude in the video
[16:04:17] <ReadError> r00t4rd3d: 2'
[16:04:34] <ReadError> makes a crapload of dust
[16:07:18] <DJ9DJ> gn8
[16:50:48] <Tom_itx> tripod|,
[16:51:01] <Tom_itx> http://kvarc.extra.hu/step/motor/emc/emckinematics.html
[16:51:37] <tripod|> Tom_itx i want to controll something similar to rostock
[16:52:27] <tripod|> https://www.youtube.com/watch?v=3UOq-CQsbNo
[17:07:52] <cncbasher> tripod|https://www.dropbox.com/sh/dl837bg4yg4ii16/vQIZd17-Ae/delta
[17:12:23] <Tom_itx> did you write that?
[17:13:10] <tripod|> cncbasher and where do i find the calcs?
[17:13:21] <Tom_itx> deltakins.c
[17:13:39] <Tom_itx> looks rather similar to the link i gave you
[17:14:26] <cncbasher> those files came the same guy
[17:14:41] <tripod|> thats same as u gave me, but i want to do like rostock with linear axis
[17:14:44] <cncbasher> i've not used them as yet
[17:16:15] <tripod|> i think, i have to draw first, then i can bether calc i think
[17:50:23] <mrsun> i wonder if my repair will hold :/ looks like its cracked already :P
[17:50:28] <mrsun> or its just not fused at the end
[17:50:52] <mrsun> but i can atleast happily say that the back gear has 0 wear on it on the lathe :P
[17:50:58] <mrsun> made it hard as hell to make a tooth to fit :P
[17:53:15] <mrsun> oh well if it doesnt hold i can always redo it :P
[17:53:22] <mrsun> if i dont break more gear teeth in the process ;P
[19:32:23] <Shanker51> hello
[19:32:28] <Shanker51> how are you all
[22:34:03] <uminded> I get a ton of "Attempt to use kernel headers from user space" warnings when compiling, I get no other errors and evert test in "runtests " fails