#emc | Logs for 2008-12-18

[00:12:42] <archivist> I think there are tricks with multiplier chips as well
[00:37:01] <maddash> jmkasunichalso, if you are trying to rectify a "signal" (a wire referenced to ground) instead of some power source like a transformer winding, a bridge will NOT give you full wave rectification <==== why?
[00:37:50] <fenn> diode leaks a certain amount of charge before the "check valve" closes
[00:38:04] <fenn> since the signal is so low current, that takes a while
[00:38:42] <fenn> oh, also your signal is probably offset so that the sine wave is not zero volts average
[00:38:59] <maddash> oh, it is
[00:39:34] <jepler> http://emergent.unpy.net/index.cgi-files/sandbox/white-men-oats.jpg
[00:40:11] <fenn> jepler: what's that from?
[00:40:38] <jepler> fenn: apparently it's a vintage quaker oats advertisement, but I saw it in connection2 episode "flexible response"
[00:41:24] <fenn> hm. "Flexible response represented a capability to fight across all spectrums of warfare, not just with nuclear arms"
[00:41:58] <fenn> "wherever white men live, Flexible Response(tm)"
[00:42:29] <jepler> about 7:30 in http://www.youtube.com/watch?v=lOgygALht-g
[00:42:47] <maddash> damnit, I using two diode bridges
[00:43:40] <maddash> i tried using*
[00:44:06] <fenn> ah, its like browsing wikipedia, but on TV
[00:44:34] <jepler> fenn: yes, a little bit
[00:45:20] <jepler> whenever I know what Burke is talking about I'm disappointed with the depth, but when I don't I enjoy it
[00:47:03] <maddash> i accidentally the probe
[00:54:26] <jepler> at one time or another we all accidentally the probe
[01:16:56] <maddash> archivist: I built the second circuit on that page you sent me, but it's not working...
[03:03:05] <jmkasunich> anybody remember how to stop the axis preview (I loaded a g-code program with an infinite loop)
[03:03:14] <jmkasunich> I tried esc...
[03:06:24] <skunkworks> ctrl c?
[03:06:33] <skunkworks> I thought esc worked
[03:06:43] <skunkworks> ctrl break
[03:07:01] <jmkasunich> it eventually recovered, dunno if it was esc or not
[03:07:08] <jmkasunich> but emc seems to have lost its mind
[03:07:19] <jmkasunich> I reloaded the program without the infinite loop, preview looks ok
[03:07:25] <jmkasunich> hit run, spindle starts, no motion
[03:07:30] <jmkasunich> hit esc, spindle stops
[03:07:33] <jmkasunich> jogs don't work
[03:07:44] <jmkasunich> hit f5, get the mdi menu, enter a g0, no motion
[03:08:08] <jmkasunich> time to restart I guess - and touch off again
[03:08:28] <skunkworks> http://www.linuxcnc.org/irc/irc.freenode.net:6667/emc/2006-04-25.txt
[03:11:51] <skunkworks> yeck
[03:21:33] <jmkasunich> nibble nibble nibble
[03:21:45] <jmkasunich> this may be the strangest threading ever
[03:22:51] <SWPadnos> jmkasunich, it's something like msg(AXIS, stop)
[03:23:36] <jmkasunich> that needs to be built into the g-code
[03:23:57] <jmkasunich> if I was smart enough to do that, I wouldn't have written the infinite loop
[03:24:12] <SWPadnos> some infinite loops are intentional
[03:24:13] <jmkasunich> it wasn't supposed to be infinite - forgot an increment in the loop body
[03:24:36] <jmkasunich> understood - that msg solves a problem, but not my problem
[03:24:38] <SWPadnos> like "loop forever running a part and waiting for the operator to press 'cycle start'"
[03:24:47] <SWPadnos> oh, then esc :)
[03:25:08] <SWPadnos> which apparently didn't work as I'd expect
[03:25:13] <jmkasunich> it got all boggled even after it eventually came out of the loop
[03:25:52] <jmkasunich> even when I don't have an infinite loop, one run of this program generates enough backplot to make axis quite sluggish
[03:26:08] <SWPadnos> that's interesting
[03:26:30] <SWPadnos> the amount of backplot is limited - it should start erasing old opints as new ones are added
[03:26:34] <SWPadnos> points
[03:26:38] <jmkasunich> I'm cutting an internal acme thread, that is 0.12 wide at the top of the groove, 0.08 at the bottom, 0.10 deep
[03:26:54] <jmkasunich> any attempt to cut it normally chatters like crazy
[03:27:07] <SWPadnos> but lately - in the last few months maybe, it seems like there's a slowdown in axis after a while
[03:27:11] <jmkasunich> so I'm using a cutter that is only about 0.020 wide, "nibbling" at it
[03:27:20] <SWPadnos> I noticed it, but haven't had a chance to look into it at all
[03:28:44] <SWPadnos> was it preview or backplot you wanted to stop?
[03:28:56] <jmkasunich> preview
[03:29:00] <SWPadnos> ok
[03:29:17] <SWPadnos> there's an option for backplot, but not for preview (except ESC, which should stop it I think)
[03:31:56] <jmkasunich> I've moved on ;-)
[03:32:10] <SWPadnos> heh. time for me to go back out to the frozen garage anyway
[03:32:11] <jmkasunich> program has been running for 10+ minutes
[03:32:25] <SWPadnos> it's darned uncomfortable installing crap way up under the dash
[03:32:33] <jmkasunich> I hate that
[03:32:45] <jmkasunich> standing on your head
[03:32:52] <SWPadnos> at least I was able to fix the blown speaker easily
[03:33:01] <SWPadnos> yeah - if only I were from the planet Ork
[03:33:06] <jmkasunich> I thought you were doing brakes?
[03:33:08] <SWPadnos> I'd be used to sitting that way
[03:33:13] <SWPadnos> brake controller
[03:33:27] <SWPadnos> the wiring out to the trailer hitch/jack was preinstalled
[03:33:33] <jmkasunich> what exactly is a brake controller?
[03:34:05] <SWPadnos> it's teh thing that looks at the brake switch (the one that turns on the brake lights), and applies power to the trailer brakes
[03:34:34] <SWPadnos> I was surprised to learn that there is *no* proportional output available for modulating trailer brake power
[03:34:37] <jmkasunich> isn't the brake light wire part of the harness going to the trailer already?
[03:34:46] <SWPadnos> yes
[03:34:54] <jmkasunich> so why the dash diving?
[03:35:06] <SWPadnos> except that the driver has to set the amount of power to apply, which is dependent on trailer load
[03:35:18] <jmkasunich> oh, a knob?
[03:35:22] <SWPadnos> there are timed units - bad in an emergency
[03:35:50] <SWPadnos> there are intertial units, which have an inertial sensor and apply power depending on how much braking they "sense" you're applying
[03:36:05] <SWPadnos> so there's a box and a knob, plus an emergency lever
[03:36:36] <SWPadnos> and then there's the wire (30A) and circuit breaker for the whole mess, which has to come more or less straight from the battery
[03:37:06] <SWPadnos> but hey, at least the blue wire was preinstalled :) http://www.wjjeeps.com/electric_brake_inst.jpg
[03:39:26] <SWPadnos> incidentally, I may change my plans and make it a 2-day drive each way. I'm not sure I'll get out of here at any reasonable time tomorrow morning (since I'm still installing the brake controls), and it may be better to plan on 5-6 hour driving days, in case they turn into 12 hour days due to weather
[03:39:37] <SWPadnos> much better to plan on 6 and have 12 than plan on 10 and have 20
[03:39:45] <SWPadnos> (hours of driving)
[03:40:49] <jmkasunich> yeah
[03:41:16] <jmkasunich> I forgot they are open this saturday
[03:44:40] <SWPadnos> if Saturday is bad for you, let me know
[03:45:15] <jmkasunich> not a problem
[03:45:36] <jmkasunich> their parking lot will be busier, but we can deal with that
[03:45:43] <SWPadnos> ok, thanks
[04:02:28] <[1]a-l-p-h-a> [1]a-l-p-h-a is now known as a-l-p-h-a
[04:51:57] <JymmmEMC> SWPadnos: Yo, check it out... http://newspaperads.mercurynews.com/ROP/ads.aspx?advid=32664&adid=7347234&subid=24662952&type=
[05:53:24] <dave_1> HI Dan
[14:08:16] <cradek> jepler: do you think yang's question was about not being able to use apt?
[14:09:04] <jepler> yes, that's what I thought it was
[14:09:29] <jepler> I still do
[14:10:14] <cradek> so he was able to get the CD but not install updates or new packages - ick.
[14:10:27] <jepler> yes, because his campus somethingsomething
[14:14:48] <archivist> or he doesnt know how to connect to web correctly
[15:25:08] <anonimasu> hmm
[16:09:28] <toastatwork> hmmmmm
[16:48:56] <jmkasunich> note to self - always call metal express before placing an order
[16:49:14] <jmkasunich> pricing over the phone from the local office is just a bit over half of the online quote
[16:49:24] <skunkworks> Nice
[16:49:28] <cradek> wow.
[16:49:28] <jmkasunich> (at least it is today)
[16:49:50] <jmkasunich> it is usually a bit better, once or twice worse - I've never seen this much difference before tho
[16:50:04] <jmkasunich> I wonder if she made a mistake somewhere
[16:50:07] <cradek> when I wanted to order a bunch of metal recently, they were one place I checked, and I wasn't impressed by their pricing.
[16:50:22] <jmkasunich> what were you comparing them to?
[16:50:44] <cradek> looks like I ordered from onlinemetalsupply.com
[16:50:46] <eric_u> I would guess everyone has high prices right now since the metals market has gone way down
[16:50:54] <cradek> this was early Nov.
[16:51:18] <jmkasunich> I forget to check onlinemetal
[16:51:56] <jmkasunich> metal-express has a warehouse in town - she says there is a good chance this will be ready for me to pick up around 2:30 when I expect to be in that neighborhood anyway
[16:52:15] <jmkasunich> so what I save in shipping makes a big difference
[16:52:27] <seb_kuzminsky> jmkasunich: that's handy :-)
[16:52:29] <cradek> that's sure nice I bet.
[16:52:46] <jmkasunich> this order isn't that much, maybe 20 lbs
[16:52:46] <cradek> I have a local supplier too, but they are pricy and I only go there when it's urgent.
[16:52:56] <jmkasunich> I've bought 100 lbs at once before, shipping sucks on that
[16:54:17] <BigJohnT> scrap metal prices have dropped a lot in the last month
[16:54:46] <jmkasunich> china is no longer buying everything that isn't bolted down
[16:55:22] <skunkworks> dad got rid of a lot of copper and iron while it was up.
[16:55:29] <jmkasunich> smart
[16:55:50] <jmkasunich> we had probalby 200 lbs of copper and similar of aluminum collecting at work
[16:56:03] <jmkasunich> should have unloaded it a while back, but we did it last week instead
[16:56:03] <archivist> I missed getting rid of two scrap vans while the price was high
[16:56:12] <jmkasunich> I didn't hear what they got for it
[16:56:21] <skunkworks> copper was around $3 a pound for a while. (for the good stuff)
[16:56:33] <jmkasunich> yeah
[16:56:39] <jmkasunich> and we had the good stuff
[16:56:57] <jmkasunich> 500MCM wire, prototype busbars that didn't work out
[16:56:58] <BigJohnT> the hillbillies quit hauling scrap steel in to town about a month ago
[16:57:22] <jmkasunich> I'm afraid the junkies are still stripping piping out of abandoned houses around here
[16:57:31] <jmkasunich> although probably not as bad as it was
[16:57:35] <skunkworks> yeck
[16:57:43] <BigJohnT> some of the trucks and trailers they used should have been left at the scrap yard
[17:02:50] <skunkworks> BigJohnT: are you in Saint Joseph
[17:03:02] <BigJohnT> no, Poplar Bluff
[17:04:05] <eric_u> scrapyards shouldn't buy plumbing from anyone other than licensed contractors
[17:04:46] <skunkworks> heh - you're funny. ;)
[17:04:55] <BigJohnT> in MO you have to show your drivers lic and they make a copy of it if you sell more than $50 of scrap to a dealer
[17:05:01] <eric_u> the brother of someone I know had a vacant rental, they got $50 worth of copper that cost him $5k to replace, and he did the work
[17:05:17] <jmkasunich> that is rampant around here too
[17:05:25] <eric_u> luckily the fact that they left the water running was not a big deal
[17:05:33] <skunkworks> wow
[17:05:33] <cradek> eric_u: they'll move on to wiring, and "naturally deselect" themselves
[17:05:47] <jmkasunich> unfortunately most of them don't
[17:05:49] <skunkworks> * skunkworks goes to the darwin awards sit
[17:05:51] <skunkworks> site
[17:06:19] <eric_u> I don't see that it is going to hurt us too much if private individuals can't sell copper to scrapyards
[17:06:22] <jmkasunich> * jmkasunich has absolutely no sympathy for those
[17:06:48] <eric_u> Ohio seems to control the sale of junk vehicles to scrapyards to the owner of the title
[17:07:26] <eric_u> but they probably just want the title transfer fees
[17:07:59] <jmkasunich> probably
[17:27:29] <anonimasu> hm..
[17:27:36] <anonimasu> seems like im finally getting machinetime on the mill
[17:28:07] <anonimasu> err machining time
[17:52:50] <anonimasu> http://imagebin.org/33931
[17:55:10] <seb_kuzminsky> mmm swarf
[17:55:47] <anonimasu> yeah cant really avoid it :)
[17:57:03] <anonimasu> flood coolant throws it all around the machine
[21:19:53] <cradek> wow, dave e's synergy part looks nice
[21:20:24] <jepler> wow neat
[21:20:57] <cradek> I've never modeled a part in solids and had a machine cut it
[21:21:02] <DanielFalck> where are they posted?
[21:21:05] <seb_kuzminsky> link?
[21:21:11] <jepler> http://imagebin.ca/view/EGO40Lt.html
[21:21:11] <jepler> http://imagebin.ca/view/dHfREsy.html
[21:21:16] <DanielFalck> thanks
[21:21:36] <DanielFalck> wow that's really nice
[21:21:38] <cradek> I always manually program tool paths (with more or less programming behind it)
[21:21:38] <anonimasu> cool :)
[21:21:46] <jepler> http://article.gmane.org/gmane.linux.distributions.emc.user/11456
[21:21:51] <cradek> seems like some kind of magic otherwise
[21:22:02] <seb_kuzminsky> neat :-)
[21:22:10] <anonimasu> I usually hand program everything too
[21:22:20] <anonimasu> most stuff are easy enough to just hack a few cycles togther :)
[21:22:27] <DanielFalck> apt360 here...
[21:23:08] <jepler> that must be 5-axis work?
[21:23:15] <cradek> DanielFalck: can you do a curvy surface like that? I got the apt book but it seems like it's all about cutting around outlines (2.5d)
[21:23:28] <DanielFalck> I don't do anything exotic- just 2.5 right now
[21:23:34] <jepler> or just multiple mountings?
[21:23:37] <cradek> jepler: no, he used a ballnose mill and then filed it
[21:23:46] <cradek> oh yeah, the inside cuts were a different mounting
[21:23:46] <DanielFalck> you can do stuff on cones/cylinders/spheres
[21:23:50] <anonimasu> I see
[21:23:56] <DanielFalck> it doesn't do surfacing
[21:23:56] <anonimasu> then it's not as cool :p
[21:24:20] <DanielFalck> but then you can use other stuff nowdays for that- pycam is a good start
[21:24:22] <cradek> dave e has a mazak just like the one at rolands, except without everything working so nicely :-)
[21:24:31] <anonimasu> hehe
[21:24:32] <toastatwork> my spell check menu has never appeared in iceweasel - anyone else have this problem
[21:25:04] <anonimasu> the flowline contouring stuff I did for the press tool was done in mc..
[21:25:07] <DanielFalck> http://imagebin.org/33945
[21:29:44] <jepler> somebody needs to figure out how to make scrollbars inside pngs work right
[21:30:20] <DanielFalck> you want to look at the code?
[21:33:05] <DanielFalck> http://pastebin.ca/1288799
[21:33:22] <DanielFalck> miss named it in the first line : )
[21:52:15] <anonimasu> cute :)
[21:55:19] <Vortex> good evening
[21:55:32] <Vortex> I have a bit of proplem
[21:56:12] <Vortex> my spindle motor is bushless dc motor
[21:56:34] <Vortex> how can I drive it using normal VFD?
[22:34:59] <dmess> i bought a cnc4pc.com spindle controller card that takes step/dir
[22:35:21] <dmess> havent hooked it all up yet though
[22:43:28] <seb_kuzminsky> http://www.youtube.com/watch?v=zMBQuWb7GJg
[22:43:46] <seb_kuzminsky> those kids get down
[22:44:36] <BigJohnT> Bluegrass!
[22:44:55] <seb_kuzminsky> http://www.youtube.com/watch?v=zTHgDQFnMZc
[22:45:06] <BigJohnT> I don't have any speakers on this box
[22:45:24] <seb_kuzminsky> you're missing out then ;-)
[22:45:30] <BigJohnT> Jethro Tull is playing on the other one...
[22:45:50] <seb_kuzminsky> lol the guitar's bigger than the player
[22:47:14] <cradek> seeing these kinds of videos makes me less sad that the old bluegrass folks (that are left) are getting so old
[22:48:03] <BigJohnT> I like the Dillards
[22:48:13] <seb_kuzminsky> i havent listened to much bluegrass before now
[22:48:23] <seb_kuzminsky> what's some good warp-speed pickin' i should look for?
[22:48:30] <BigJohnT> and Pink Floyd
[22:49:23] <BigJohnT> Bela Fleck
[22:49:26] <cradek> I like these guys: http://www.youtube.com/watch?v=Za2BOPECRtE
[22:50:52] <BigJohnT> who is it cradek? I'm on dial up...
[22:51:43] <cradek> BigJohnT: just some unknown group at some outdoor festival - there are lots of them on youtube!
[22:52:21] <BigJohnT> seb_kuzminsky: check out Jimmy C. Newman too... not bluegrass but raised on crawfish
[22:53:30] <cradek> seb_kuzminsky: also check out one of theirs where their singer sings - she has a voice twice as big as she is
[22:53:58] <seb_kuzminsky> cradek: the hillbilly gypsies?
[22:54:02] <cradek> yeah
[22:54:19] <cradek> bbl
[22:54:28] <seb_kuzminsky> ok i will, the one you linked is pretty sweet :-)
[22:54:32] <seb_kuzminsky> see you later cradek
[22:54:54] <BigJohnT> oh boy Baba O'Riley is playing now
[22:56:18] <BigJohnT> seb_kuzminsky: you ever listen to Alison Krauss?
[22:56:33] <seb_kuzminsky> BigJohnT: i never have
[22:57:11] <BigJohnT> she has the most amazing range and sings real sweet
[22:58:02] <seb_kuzminsky> i'll look for it
[22:58:15] <BigJohnT> check out New Favorite by Alison Krauss and Union Station
[22:58:21] <seb_kuzminsky> i'm digging the hillbilly gypsies version of fire on the mountain right now :-)
[22:58:43] <BigJohnT> Sweet! as they say a little south of me
[23:01:39] <BigJohnT> here you go seb_kuzminsky http://nl.youtube.com/watch?v=3-mTAIXgGww
[23:02:15] <seb_kuzminsky> * seb_kuzminsky clicks
[23:03:19] <BigJohnT> * BigJohnT listens to Donald Fagen
[23:17:17] <BigJohnT> * BigJohnT heads upstairs to get confortably numb...
[23:33:44] <jmkasunich> cradek: you ain't kidding about her voice
[23:33:45] <jmkasunich> http://imagebin.ca/view/EGO40Lt.html
[23:35:21] <maddash> who's voice?
[23:39:29] <seb_kuzminsky> maddash: http://nl.youtube.com/watch?v=YctdxEOSbFE&feature=related
[23:47:43] <maddash> omg she's hot
[23:54:13] <jmkasunich> oh, no wonder you were confused, I posted the wrong URL
[23:54:18] <jmkasunich> http://nl.youtube.com/watch?v=Pm7BpVU5Gwk
[23:54:53] <jmkasunich> re: hot - in the intro to that song, the guitar player introduces her as his wife, then says "Sorry, boys"