#emc | Logs for 2011-02-13

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[00:00:44] <danimal_garage> adios!
[00:01:08] <JT-Shop> good night
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[00:12:47] <andypugh> In a hotel in Finland. I could not persuade the linuxcnc client to connect, is this working?
[00:14:12] <Valen> no
[00:14:17] <Valen> you are all alone in the world
[00:14:31] <andypugh> If so... Where might one find a list of the firmwares included in the emc-firmware package? git.linuxcnc.org has the source, but not the resultant .bit files.
[00:14:39] <Valen> andypugh: nobody can hear you
[00:14:39] <Valen> you and all those finish babes
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[00:15:44] <andypugh> The Finnish lasses are quite lovely, it has to be admitted, but woefully lacking in G-code and C related conversational gambits.
[00:19:04] <Valen> so take them to bed and educate them ;-P
[00:20:04] <Valen> as to the firmware, well I can only help you with innuendo and single entendre commedy
[00:25:09] <andypugh> Valen: What version of emc2 are you running? Could you look in /lib/firmware/hm2/7i43 ?
[00:25:21] <Valen> don't have access to it sorry
[00:25:29] <Valen> mill computer is switched off and 20km away
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[00:27:00] <andypugh> I am about 10 degrees north of my machine, I think I win / lose
[00:27:11] <Valen> probably
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[00:42:18] <andypugh> <sulk> Night all
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[14:06:22] <awallin> hmh gotta go out and it's -16C
[14:07:13] <jthornton> 34F and sunny here
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[15:38:23] <JT-Shop> what kind of capacitor should I look for for the MAX6675? http://www.maxim-ic.com/datasheet/index.mvp/id/3149
[15:43:03] <awallin_> that is a 'decoupling' cap just to filter the Vcc
[15:43:30] <awallin_> 0.1uF electrolytic and 100pF ceramic in parallel is common
[15:44:26] <JT-Shop> so the 0.1uF should be an electrolytic?
[15:45:07] <awallin_> it doesn't have to be but an electrolytic will be smaller in size than a plastic/ceramic
[15:45:26] <JT-Shop> size won't matter much
[15:45:45] <awallin_> did you want to multiplex the T+ and T- inputs?
[15:46:06] <JT-Shop> I'm not sure
[15:46:20] <JT-Shop> the ocean one seems to switch only one
[15:47:39] <JT-Shop> something like this for the cap http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=490-5380-ND
[15:48:10] <awallin_> see fig 11 here: http://www.analog.com/static/imported-files/application_notes/34661261AN369.pdf
[15:48:12] <JT-Shop> could you tie all the T- together and just multiplex the T+?
[15:49:08] <awallin_> yes that cap will be fine, maybe a few uF electrolytic also if you are worried about noise
[15:50:26] <JT-Shop> not worried yet :)
[15:51:54] <JT-Shop> so in fig 11 the switch both + and - and use an isothermal block
[15:51:59] <JT-Shop> cool
[15:52:22] <awallin_> I'm not sure if you could tie together all -
[15:52:38] <awallin_> have to be careful with all metal-metal contacts when working with t-couples
[15:54:48] <JT-Shop> the ADG609 will switch 4 pairs of lines
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[15:55:56] <JT-Shop> http://www.analog.com/static/imported-files/data_sheets/ADG608_609.pdf
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[15:57:03] <JT-Shop> oh heck I just noticed on the AN-369 sheet they tell you what multiplexer they use :)
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[15:58:20] <JT-Shop> I wonder if they make a 1/2 size ADG507A
[16:00:25] <JT-Shop> ah here it is the ADG609
[16:02:43] <JT-Shop> awallin_: thanks for all the help
[16:03:01] <awallin_> np
[16:09:01] * JT-Shop finds some motivation and heads up to the roof
[16:18:27] <pcw_home> A lowly 74HC4051 will work as well as the ADG parts for thermocouple signals (since you dont need +-10V input range and guaranteed inputs off when unpowered)
[16:26:49] <JT-Shop> less than a buck too
[16:28:06] <JT-Shop> do they have one that is 2x4:1 in the 4051 series?
[16:49:11] <pcw_home> 4052 I think
[16:50:21] <pcw_home> the real secret here is low power dissipation on the card so you have very small thermal gradient
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[16:56:45] <JT-Shop> yep, 4052 <$1
[16:57:35] <JT-Shop> pcw_home: did you see how it is done in fig 11 here? http://www.analog.com/static/imported-files/application_notes/34661261AN369.pdf
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[17:03:25] <mrsunshine_> hmm, a 15mm "thick" timing belt, is that to small for spindle drive?
[17:03:32] <mrsunshine_> (0.37kw motor)
[17:05:57] <archivist> sounds to big, do you mean wide
[17:06:08] <pcw_home> Yes, they use another junction to compensate for the fact that the AD594 may be at a different temperature than the input terminal block
[17:06:10] <pcw_home> but if you only have 4 channels, and you can keep the input terminal block/mux/max part at the same temperature you should be fine
[17:06:12] <mrsunshine_> yes, wide is what i mean =)
[17:06:34] <mrsunshine_> im going to order pulleys etc so its good to know if it will be up to scratch :P
[17:06:53] <archivist> there are some online belt calculators
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[17:07:10] <mrsunshine_> that shows how much power they can take also? :)
[17:09:12] <archivist> teeth in pulley? pitch? rpm?
[17:09:59] <mrsunshine_> small one im thinking of 48 and big one 64, 5mm pitch and 2750 rpm on big one =)
[17:11:42] <JT-Shop> pcw_home: thanks
[17:12:37] <mrsunshine_> or if its 56 on small one, either way running it at 56 koggs should take less power then running it at 48 :P
[17:14:24] <archivist> mrsunshine_, http://www.roymech.co.uk/Useful_Tables/Drive/Timing_belts.html
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[17:17:30] <mrsunshine_> wth is "mpm" ? :)
[17:19:07] <archivist> metres per minute surface speed probably
[17:19:19] <mrsunshine_> ahh
[17:19:26] <cpresser_> divide by Pi and diamater and get RPMs
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[18:27:26] <jrshaul> I want to make some headphones out of aluminum.
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[18:28:29] <IchGuckLive> best to bay them not selfmade
[18:28:54] <jrshaul_> The headphone transducers are from some very heavily damaged Beyerdynamics.
[18:29:00] <jrshaul_> I'm just making the housing.
[18:29:12] <rooks> cots > nih, unless you really know what youre after
[18:29:28] <jrshaul_> ?!?
[18:29:39] <IchGuckLive> Hi all in the USA .Question is there in NY a Naiborhood Railway ,2nd Question is there anything like one month ticket in use in the USA
[18:29:55] <rooks> jrshaul_, its on wikipedia
[18:30:19] <jrshaul_> I'd like to find some aluminum tube that's tougher than the stuff I've got. I have about a foot of 4.5" turbocharger plumbing, but it's very soft - you can make permanent markings with a ballpoint pen.
[18:30:22] <jrshaul_> VERY annoying.
[18:30:31] <jrshaul_> rooks: Are you talking about healthcare systems or aluminum?
[18:30:53] <rooks> what?
[18:31:17] <jrshaul_> cots>nih
[18:31:30] <jrshaul_> I don't know what COTS is, but NIH has several meanings depending on location.
[18:31:33] <rooks> so? its on the wikipedia
[18:31:59] <rooks> cots - commercial of the shelf, nih - not invented here syndrome
[18:32:17] <jrshaul_> Ah.
[18:32:22] <jrshaul_> Yeah, I'd agree with that.
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[18:32:42] <rooks> derp
[18:32:54] <jrshaul_> I'm trying to make a few $ selling kits for fancy headphone amplifiers. Turns out that if you spend $30 on semiconductors you can build a really fantastic one from a NatSemi datasheet.
[18:33:22] <jrshaul_> I can sell the kits for ~$75. $15 for passive components & PCB + $30 for semiconductors = $45, and $30 profit.
[18:34:19] <jrshaul_> Ordinarily, desigining such a thing is really, really difficult - you need an EE to spend quite a bit of time on it. My approach has a much higher per-unit cost, but the overhead is zero.
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[21:20:33] <tom3p> yakawa manual shows an rc snubber for the motor brake.
[21:20:34] <tom3p> brake coil is 24Vdc. shouldn't it use a diode?
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[21:44:02] <UnderSampled> http://pastebin.com/cVzmZpaa
[21:44:05] <UnderSampled> what's that mean?
[21:49:23] <danimal_garage> no clue
[21:58:25] <danimal_garage> yay my enclosure pannel is almost done
[21:58:32] <danimal_garage> everything fit nicely
[22:00:21] <UnderSampled> danimal_garage: pics?
[22:01:04] <tom3p> did you size the enclosure to the panel or the make project fit on the panel :)
[22:01:09] <tom3p> i keep adding more terminal blox
[22:01:43] <danimal_garage> no pics yet
[22:02:06] <danimal_garage> tom3p, i got the enclosure first then layed it out to fit
[22:02:16] <tom3p> :)
[22:02:23] <danimal_garage> but the price was right, i figured it was worth the chance
[22:02:44] <tom3p> UnderSampled, does the file exist in EMC2_RTLIB_DIR=/usr/realtime-2.6.32-122-rtai/modules/emc2 and do you have perms?
[22:03:14] <UnderSampled> tom3p: I know the file exists
[22:03:37] <UnderSampled> what I don't understand is, this is from a vanilla install from the emc live cd
[22:03:46] <UnderSampled> it should work out of the box, right>
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[22:07:46] <tom3p> yes, id say so, but since it doesnt, try to get more info on why "Operation not permitted" sounds like perms
[22:15:03] <tom3p> fwiw """If you get an error like Realtime system did not load then stop the rtai with $ halcmd unloadrt all then $ halcmd stop then start again. Sometimes the first load will clear up an issue... """
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[22:18:29] <tom3p> very similar errors http://www.mail-archive.com/emc-users@lists.sourceforge.net/msg25326.html
[22:20:41] <danimal_garage> so how do i install 2.4.x? Is it the same process as the 2.3.x install (burn the image on a disk)? There's nothing currently installed on the hdd i'm using, it would be a fresh install
[22:21:21] <tom3p> UnderSampled, ^^^ was resolved by editing grub line do you have this in logs? [ 0.000000] Local APIC disabled by BIOS -- you can enable it with "lapic"
[22:22:44] <UnderSampled> tom3p: I'll be right back, the computer is downstairs
[22:23:20] <tom3p> danimal_garage, burn bootable cd image to disk, boot disk , choose to install now or wait till you test drive the 'live' vrsn
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[22:25:05] <Valen> livecd is probably 2.3
[22:25:10] <Valen> just install and update
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[22:26:38] <tom3p> "The EMC2 team has a custom Live-CD (EU mirror) based on Ubuntu 10.04 with emc 2.4.x included,"
[22:26:58] <Valen> eh, there ya go
[22:27:06] <tom3p> i can guess the US mirror is also 2.4.x but cant guaranty it
[22:27:54] <micges> livecd is with 2.4.3
[22:29:00] <tom3p> thx
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[22:38:02] <UnderSampled> tom3p: that seems to have worked
[22:38:02] <UnderSampled> thanks
[22:38:12] <tom3p> great!
[22:38:14] <UnderSampled> how again do I make that change permanent?
[22:38:27] <UnderSampled> I only just tried it from the boot menu
[22:44:21] <danimal_garage> sweet! thanks for the info guys
[22:44:44] <tom3p> UnderSampled, hmm, the only place i can find is /boot/grub/grub/cfg which says 'do not edit' why do they make it so masonic?
[22:46:49] <Valen> if you want to change grub stuff you need to edit things like /etc/default/grub and stuff in /etc/grub.d
[22:46:55] <Valen> then run update grub
[22:47:13] <Valen> grub2 is super user friendly like that
[22:47:22] <Valen> 1000 times better than the old grub
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[23:08:08] <danimal_garage> http://www.homebrewedcomponents.com/machine_pics/
[23:08:33] <danimal_garage> some pics of my electrical pannel and some of a quick change pallet system i made for my mill
[23:10:28] <danimal_garage> i left some room for growth on the pannel
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[23:12:39] <Jymmm> danimal_garage: bicyclist supporting freak
[23:13:24] <danimal_garage> it's more like they support me
[23:13:52] <danimal_garage> see? i even used panduit, just for you, even though it's kinda mis matched
[23:13:56] <danimal_garage> miss*
[23:14:14] <Jymmm> danimal_garage: Just make it that they crash when being dumbasses, which would be ALL OF THEM - ALL THE TIME
[23:15:29] <danimal_garage> Jymmm, why the hate? did a cyclist love you and leave you? was it that damn Raul again? He keeps doing that.
[23:16:30] <danimal_garage> He said he preys on guys that spell their name with a y instead of an i, they're easy targets.
[23:16:59] <Jymmm> They never obey the laws, run lights/stops, get in the way and impede the flow of traffic, and always in blind spots/curves
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[23:17:48] <danimal_garage> do you wait for the signal at cross walks all the time if noone is coming?
[23:18:08] <Jymmm> I stop at least.
[23:18:24] <danimal_garage> as do i
[23:20:37] <tom3p> danimal_garage, nice panel, i cut slots behind mine for the flatbands
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[23:21:42] <danimal_garage> thanks!
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[23:21:53] <danimal_garage> too late
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[23:28:29] <Valen> wheres a cheap place for tools
[23:28:44] <Valen> we keep breaking them whilst working the kinks out of a part
[23:30:15] <UncleG> Is there any easy way to use a physical switch to locate the spindle? Im needing the spindle to stop in the same location for loading hexagon material. I do NOT have an encoder on the spindle.
[23:30:56] <UncleG> @valen what kind of tooling?
[23:31:11] <Valen> pretty much anything in a 6mm ball mill would do
[23:31:33] <UncleG> I would try ebay, you might get lucky.
[23:32:08] <UncleG> I buy "lots" of tooling on ebay for great price.
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