#emc | Logs for 2008-04-22

[00:15:36] <twice2> i copy kernel conf livecd installed to /boot, do make-kpkg --initrd ... but it's not bootable, why?
[00:22:27] <twice2> if you have not already, please ignore my last :-/
[00:26:00] <twice2> ok, my current goal is to compile a kernel with that will support himem and smp (livecd install) btdt???
[02:36:12] <twice2> not asking for hand holding, but is it possible to get a working smp kernel with himem from the livecd install?
[02:36:52] <cradek> you will have to build a kernel, rtai, and emc
[02:37:03] <cradek> and if you do that, you will not be able to use our released packages
[02:37:42] <cradek> also all but the very latest rtai versions, including the one on the livecd, fail if you enable > 1G of ram
[02:38:05] <twice2> no, i just want smp/himem for cad work not emc2, i want to be able to switch kernels
[02:38:17] <cradek> oh!
[02:38:23] <cradek> just install the ubuntu distributed kernel then
[02:39:11] <cradek> like maybe try linux-image-2.6.15-28-server
[02:39:11] <jmkasunich> stock ubuntu kernels do SMP just fine
[02:39:42] <cradek> err I guess you want to install linux-image-server, not the particular version
[02:39:51] <cradek> then you will get any updates (unlikely at this stage)
[02:40:47] <twice2> stock ubuntu kernel from synaptic then
[02:40:59] <cradek> yes
[02:41:03] <Be_identitycrisi> Be_identitycrisi is now known as BeIdentityCrisis
[02:41:11] <twice2> thank you
[02:41:57] <Be_identitycrisi> Be_identitycrisi is now known as BeIdentityCrisis
[02:42:08] <cradek> uh
[03:04:59] <twice2> ok getting stock kernel now. So i guessing the reason i could never compile a working 2.6.15-magma has something to do with RTAI
[03:05:39] <twice2> that just can't be menuconfig'd
[03:09:37] <twice2> i thought i could get the 2.6.15-magma source, kernel-package and then copy the config from /boot, compile and install the exact kernel from livecd
[03:11:59] <twice2> using initrd. anyway i've got enuf noobs hanging out for one night :)
[05:58:48] <ds2> anyone used one of these for feed back inplace of an encoder:
[05:58:50] <ds2> http://www.sparkfun.com/commerce/product_info.php?products_id=8681
[06:08:40] <K`zan> I haven't but it looks interesting, thank for the pointer ds2
[06:10:53] <SkinnYPupp> Cool device
[06:11:13] <K`zan> Yep, tis :).
[06:11:47] <K`zan> Getting stuff together here, good progress. Beat though gonna go fall over :). Night all.
[06:12:38] <ds2> but how well does it behave?
[06:20:37] <Sweeper> ds2: doesn't have enough linearity to work properly
[06:20:49] <Sweeper> and it's also only 10cm
[06:27:40] <ds2> the one I pasted should be 50cm
[06:29:28] <Sweeper> orite
[06:29:30] <Sweeper> anyways
[06:29:37] <Sweeper> datasheet said 5% linearity
[06:30:06] <ds2> what's to prevent that from being calibrated out?
[06:30:43] <Sweeper> dunno, I suppose \o
[06:31:03] <Sweeper> actually, I think we came to that conclusion earlier
[06:31:11] <Sweeper> * Sweeper forgets
[06:31:19] <Sweeper> we talked about it like a week or two ago
[06:31:50] <ds2> heh I see. a week ago I was buried in ESC stuff
[06:31:52] <Sweeper> oh, I think I wanted to use it with just a dc motor
[06:32:04] <Sweeper> there might have been some issue there...
[06:32:30] <Sweeper> but I think after my cartesian bot is done, I might give it a shot
[06:32:38] <ds2> i see
[06:32:40] <Sweeper> although $25 is a bit much
[06:32:50] <Sweeper> encoders don't cost that much, iirc
[06:32:56] <ds2> oh?
[06:33:48] <alex_joni> they say up to 400-500mm here: http://www.spectrasymbol.com/typo3/site/en/sensors/softpot.html
[06:33:54] <alex_joni> but still +/-3% linearity
[06:34:44] <Sweeper> hmm
[06:34:46] <Sweeper> maybe not
[06:34:54] <Sweeper> * Sweeper was thinking encoders were a lot cheaper
[06:35:10] <alex_joni> a good encoder is easily > 150$$
[06:35:28] <alex_joni> you can get low-cost encoders around 50$ iirc
[06:35:31] <Sweeper> I mean, realistically, you only need like, 50ppr
[06:35:59] <Sweeper> on 1mm pitch screws, that's .02mm resolution
[06:36:57] <Sweeper> oh, I got mine surplus, that's why I was thinking they were cheap
[06:37:04] <Sweeper> like $10 each for 128's
[06:38:15] <Sweeper> shit, with gearing + dc brush motor, even a 16x encoder would work
[06:38:32] <Sweeper> just gotta find one sans detente
[06:38:47] <alex_joni> bbl
[06:38:53] <Sweeper> http://octopart.com/info/Electroswitch/701-08-32 <-- quadrature + 32 positions
[07:02:31] <fenn> you definitely dont want to use a mechanical encoder
[07:02:46] <fenn> those are for knobs on stereos and suchlike
[07:03:09] <fenn> if you are that cheap there's always optical mouse encoders
[07:04:12] <fenn> i dont think the resistor thing will work either, how much noise? temperature variations in resistance? is it repeatable?
[07:09:39] <ds2> hmmm lots to think about
[07:13:30] <Sweeper> there's always the magnetic ones
[07:14:09] <Sweeper> http://reprap.org/bin/view/Main/MagServo
[07:15:54] <Sweeper> one flash chip down, one to go
[12:12:02] <lerman_> lerman_ is now known as lerman
[15:42:12] <rayh_> rayh_ is now known as rayh
[16:21:01] <tomp2> can I put the 6.06 LTS image onto a 1Gig usb stick and boot from that? ( using hd-less cd-less eeepc not intended to run hardware )
[16:25:33] <tomp2> hmm, eeepc is 800x480 , whats the min rez for AXIS?
[16:27:29] <fenn> 800x600
[16:30:41] <rayh> I think it will take more than 1 g. I put it on a 4 gig flash with 1.5 left over.
[16:31:21] <rayh> You could cut it down but I've not tried.
[16:31:55] <tomp2> fenn: thx would have to hack AXIS or use tkemc
[16:32:28] <fenn> could use fvwm or something that lets your desktop be bigger than screen size
[16:32:45] <rayh> Mini sizes to that automatically.
[16:33:47] <tomp2> rayh: thx, mini hint is good. I thought the cdromwas near 600meg, why wouldnt it fit in 1G thumb ( just for the install )
[16:34:15] <tomp2> fenn: goog idea about fvwm ( always liked it )
[16:34:18] <rayh> ah I think the cd stuff is compressed
[16:34:45] <tomp2> not harm in tryin! thx :)
[16:35:30] <rayh> My recent install shows 2446600 for disk usage. There are a couple extra packages there.
[16:36:18] <fenn> you could use netboot: http://archive.ubuntu.com/ubuntu/dists/dapper/main/installer-i386/current/images/netboot/ http://wiki.koeln.ccc.de/index.php/Ubuntu_PXE_Install
[17:39:44] <tomp2> fenn: thx, looking at pxe boot now
[17:46:46] <alex_joni> the CD uses a compressed squashfs
[17:46:53] <alex_joni> unpacked it's a bit larger than 1G
[17:48:04] <tomp2> alex_joni: do you think it's simpler to use a 4g thumb or to use pxe net-boot?
[17:48:15] <alex_joni> I never tried either :)
[17:48:26] <alex_joni> but I would suspect a 4g thumb to be a bit easie
[17:48:27] <alex_joni> r
[17:48:51] <tomp2> thanks
[20:56:04] <alex_joni> good night all
[21:05:48] <tomp2> nite alex
[21:52:36] <dmess> hi all