#emc-devel | Logs for 2007-09-06

[12:37:28] <skunkworks_> logger_dev: bookmark
[12:37:29] <skunkworks_> Just this once .. here's the log: http://www.linuxcnc.org/irc/irc.freenode.net:6667/emcdevel/2007-09-06.txt
[22:44:22] <jepler> I can't see any difference between the velocity or acceleration profile for keyboard incremental jogging vs jogwheel incremental jogging
[22:44:52] <jmkasunich> should you ?
[22:45:07] <jepler> my mill will stall during a jogwheel jog, but I haven't gotten it to happen during a keyboard jog
[22:45:40] <jmkasunich> does it happen for a quick spin of the wheel, or slow steady turning, or?
[22:45:56] <jepler> most often when I try to give it a quick spin
[22:46:09] <jepler> I should probably just turn down my accel and vel a few percent and see if that fixes it
[22:46:55] <jepler> the jogwheel I have is pretty noisy so there are not only stops but there are 1-count reversals (maybe larger) as well
[22:49:36] <jepler> can't achieve that with keyboard incremental jogs: http://emergent.unpy.net/index.cgi-files/sandbox/typical-jogwheel-jog.png
[22:49:56] <jmkasunich> ewww
[22:50:08] <jepler> yeah I know
[22:50:18] <jepler> when it doesn't stall, though, it's fairly usable
[22:50:21] <jmkasunich> what kind of encoder is that?
[22:50:39] <jepler> it's a mechanical knob, 24 count / 12 detent per revolution
[22:50:42] <jepler> crap but the only thing I have
[22:51:15] <jmkasunich> two carbon rods from old batteries, dragging on a quadrature wheel cut out of old chimney flashing with fingernail clippers
[22:51:24] <jepler> yes that
[22:52:28] <skunkworks> jmkasunich: I saw the trench pictures. better today?
[22:52:39] <jmkasunich> still not done
[22:52:48] <jmkasunich> I can flush, but I'm doing it with my neighbors water
[22:53:05] <jmkasunich> having a poop pipe that works is a good thing tho
[22:53:26] <skunkworks> Yes - It is :)
[22:53:30] <jmkasunich> those poor guys
[22:54:18] <jmkasunich> especially the lead plumber - his office sent him out with one apprentice, and somebody screwed up and left out an important part, which the apprentice had to go and fetch (1-1/2 hour trip)
[22:54:27] <fenn> jepler can you put a rc filter on the switch?
[22:54:59] <jepler> fenn: yes, but I'd have to redo the board it's on
[22:54:59] <jmkasunich> so the lead guy is down in the trench fighting with rocks and climbing in and out to get stuff that the apprentice should be fetching
[22:55:07] <skunkworks> so the lead plumber had to do the manual labor ;)
[22:55:09] <skunkworks> right
[22:55:34] <jmkasunich> he works his ass off whether the apprentice is there or not, but it's wastefull and inefficient to have him schlepping tools
[22:55:48] <jmkasunich> I did quite a bit of that today, just to keep things moving
[22:56:10] <jmkasunich> the rocks in this dirt are just unbelievable
[22:57:41] <jmkasunich> there's a 12 pack of Killians in my fridge with the guy's name on it for tomorrow
[22:57:51] <jmkasunich> (well, 11 pack now, I was thirsty)
[22:58:20] <jepler> I may have to issue a mea culpa on this one .. I lowered my maxvel 10% from 1.2 to 1.1 (ips) and can't get it to stall
[22:58:39] <jepler> so it's more that the jogwheel "random position generator" was better able to stress the machine than gcode or keyboard jogging was... ?
[22:58:51] <jmkasunich> lol
[22:59:04] <jepler> maybe that's what the random number generator component is good for
[22:59:14] <jmkasunich> yeah, keyboard or g-code usually only goes from 0 to 1, not -1 to 1
[22:59:30] <jmkasunich> I guess g-code can do - to +, if you write it that way
[22:59:53] <skunkworks> :) I only needed a plumber to put the septic in the house previous house I built. (for some reason you need a licence to do that;)) but he was excellent.
[23:00:17] <jmkasunich> the guy thats been working here is great, but his office is staffed by idiots
[23:00:28] <jmkasunich> the job was quoted as three men for three days
[23:00:37] <jmkasunich> day 1, I got one man for half a day
[23:00:44] <jmkasunich> phone
[23:05:02] <jmkasunich> day 2 - two men all day, and a third for half a day
[23:05:08] <jmkasunich> today, 2 men all day
[23:05:12] <jmkasunich> total man days: 5
[23:05:18] <jmkasunich> quoted for nine
[23:05:32] <jmkasunich> if they had sent 3 men each day it would be done by now
[23:05:45] <jmkasunich> bbl
[23:06:21] <jepler> I have this sinking feeling I introduced a bug, or else revealed one in axis
[23:06:52] <jepler> frequently I hit F5 to issue an mdi command, but nothing happens .. switching tabs sometimes makes it work
[23:07:09] <jepler> the bug I fixed had to do with MDI commands being "partially accepted" in machine off mode ...
[23:07:22] <jepler> anybody else seen this, or am I unique?
[23:08:49] <jepler> and for that matter, why is g28 g53 z0 rejected?
[23:09:04] <jepler> "go to Z=0 in machine coordinate system, then go to G28 home"
[23:15:52] <SWPadnos> G28 and G30 are explicitly defined as being in machine coordinates, I think
[23:16:20] <jepler> no, when I programmed G28 Z0 it seemed to move in the active (G54) coordinate system to Z0, then move to G28 home (in machine coordinates)
[23:16:44] <SWPadnos> ok, I didn't understand exactly what you meant
[23:17:32] <jepler> that's OK, that gcode I mentioned may not be wanted by anybody
[23:27:20] <jepler> bbl
[23:36:23] <cradek> hi guys
[23:39:36] <cradek> g28 is so screwy
[23:41:23] <cradek> g28 z0 makes only the z axis move (to relative 0 and then to absolute 0)
[23:41:51] <cradek> I think the thing you want is not possible
[23:43:44] <cradek> jepler: your indicator is here
[23:46:07] <jepler> cradek: ok thanks
[23:46:29] <jepler> I got feeler gauges today too
[23:47:02] <cradek> I guess you could get a rough idea of alignment with those
[23:47:57] <cradek> the 2" chinese indicator I got is interesting - it indicates 0.000 and 2.000 just fine (123 block) but 0.998
[23:48:33] <cradek> so who here suspects the $10 chinese indicator and who suspects the Browne & Sharpe 123 block?
[23:50:03] <jepler> cradek: yeah I thought about that
[23:50:20] <cradek> jepler: come by anytime - I'll be playing in the garage
[23:50:23] <cradek> err, shop
[23:50:30] <jepler> cradek: thanks for the invite, but I doubt I will
[23:50:43] <cradek> ok
[23:50:45] <jepler> cradek: bring the indicator to the office tomorrow instead?
[23:50:58] <cradek> iirc, the holder needs doctoring
[23:51:04] <jepler> oh right
[23:51:17] <cradek> I haven't even opened it yet
[23:51:32] <jepler> you thought that part could be turned down to 1/8 ...
[23:51:34] <cradek> I might have a look tonight - if it's soft it'd be easy to turn down
[23:51:53] <cradek> if it's hard, you'll have to figure something else out
[23:52:04] <jepler> let me know
[23:52:21] <cradek> ok, bbl