#emc | Logs for 2009-12-08

[00:05:40] <dan1mal_garage> haha
[00:05:42] <dan1mal_garage> wow
[00:05:56] <dan1mal_garage> sold!
[00:06:57] <L84Supper> it must be true, since who would make up a story like that?
[00:07:39] <dan1mal_garage> a tweaker
[00:08:22] <skunkworks365> Jymmm: ping?
[00:09:14] <Jymmm> skunkworks365: yo, hard a captentry question for ya
[00:09:20] <Jymmm> had
[00:09:48] <skunkworks365> ok - I am technically a Diy'er.. :)
[00:09:58] <L84Supper> heh http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=180439918664&ih=008&category=12584&ssPageName=WDVW&rd=1
[00:10:18] <L84Supper> goggle already had it
[00:10:45] <andypugh> You could have just aked me.
[00:10:53] <Jymmm> skunkworks365: I have some 1/4 ply and want to put up some shelves in the garage. there are some now and they use three 2x4's for the brace, toe nailed together. is that strong enough?
[00:11:44] <andypugh> Is it for your balloon collection, or your osmium ingot collection?
[00:11:51] <dan1mal_garage> haha
[00:11:53] <L84Supper> andy : I just copied and pasted a couple of sentences to to see what it would find :)
[00:11:57] <skunkworks365> 1 nail?
[00:12:12] <Jymmm> skunkworks365: it apears so
[00:12:26] <Jymmm> skunkworks365: I have no nails, I use drywall screws for everything
[00:13:35] <skunkworks365> I am an over-doer... so I would say not.. (I use mostly deck screws/drywall screws also.)
[00:14:07] <skunkworks365> 1/4 plywood? how often are you supporting it?
[00:14:14] <skunkworks365> and as said above - for what?
[00:14:27] <Jymmm> hang on, let me TRY and draw something up
[00:15:34] <andypugh> I would say that 1/4" ply is fine for stopping stuff from falling through a shelf, but isn't strong enough to be a structural part.
[00:16:29] <andypugh> It's more about rigidity than strength, 5/8" particle board would be weaker, but stiffer and more suitable.
[00:23:33] <skunkworks365> bottom of drawers are 1/4 usually - so.. (also think of what kind of weight you store in there. ) ;)
[00:23:54] <skunkworks365> and how far they usually span
[00:24:31] <skunkworks365> and they are usually supported all the way around.. most of the time.
[00:25:07] <skunkworks365> jm
[00:27:57] <awallin> what does "1-1/2x8 Threaded Mounting" for a lathe chuck mean?
[00:28:17] <Jymmm> 1.5" diameter, 8 threads per inch
[00:29:27] <awallin> and what is "plain back" ?
[00:29:33] <awallin> clearly I know nothing...
[00:30:51] <andypugh> "plain back" lathe, or chuck?
[00:30:52] <Jymmm> skunkworks365: http://imagebin.ca/view/Kvek2MVu.html
[00:31:14] <Jymmm> skunkworks365: side view
[00:31:14] <awallin> andypugh: I'm looking for suitable lathe chucks
[00:31:28] <awallin> my lathe spindle has just 3 mounting holes for bolts
[00:31:30] <skunkworks> sorry computer locked up
[00:31:43] <Jymmm> skunkworks365: np, so did my brain when drawing that
[00:32:00] <andypugh> Do you have pictures of the spindle? Is this a mini-lathe?
[00:32:20] <dan1mal_garage> the thread should be the thread of the nose of the spindle
[00:32:53] <andypugh> My tiny little lathe had a spigot and 3 bolt holes, but that was a toy.
[00:33:01] <awallin> http://picasaweb.google.com/anders.e.e.wallin/JHQLathe2009_11_21#5406654152950596514
[00:33:01] <dan1mal_garage> plain back usually means there is nothing on the back of the chuck, you have to mount your own adapter plate
[00:33:28] <awallin> that spindle was made to fit an Optimum chuck, so I may go with that...
[00:33:48] <dan1mal_garage> are those threaded holes?
[00:33:57] <awallin> nope, just holes :)
[00:33:59] <dan1mal_garage> or is it cam lock?
[00:34:07] <andypugh> I think that would be your best bet, though you could easily make an adaptor plate in-situ.
[00:34:11] <awallin> no mechanism, just holes
[00:34:23] <andypugh> Cam-lock has a bigger taper
[00:34:34] <MarkusBec> MarkusBec is now known as MarkusBec_away
[00:34:44] <awallin> http://www.amazon.com/Bison-7-800-0500-Inch-Br-univ-lathe-Chk/dp/B0006MZ430
[00:34:47] <awallin> ??
[00:35:30] <andypugh> That chuck would need an adaptor plate.
[00:36:34] <awallin> not too difficult to make I guess...
[00:36:44] <andypugh> Or perhaps not. It seems that there are at least 2 different chucks in that picture.
[00:37:26] <tom3p> wish list: hal components with names ... by the time i get to comp.0., comp.1., comp.3., it'd be nice if they were HiVel, LoVel, TooHot (or whatever human readable meaningful thing user may think of )... (so 'named components')
[00:37:47] <SWPadnos> um
[00:37:56] <andypugh> Indeed not. Bolt any old bit of metal to your spindle. Bore out an accurate register for your spindle. Flip it round and bolt it on properly, machine to suit a chuck.
[00:38:04] <tom3p> eh, maybe the signal name (the 'net') suffices... nm
[00:38:04] <SWPadnos> for components made with "comp", this is already there
[00:38:26] <SWPadnos> loadrt mycomp names=fred,wilma,barney,betty
[00:38:56] <tom3p> yeh, aint that sweet, like "i'd like an orange flaveored orange colored orange shaped orange' (overload)
[00:39:14] <SWPadnos> with TheaterButter (TM) on top!
[00:39:22] <tom3p> haha
[00:40:17] <tom3p> (or i get this project done and get back to the picture gui hal builder)
[00:40:30] <andypugh> I vote for that
[00:40:32] <SWPadnos> either way
[00:40:42] <tom3p> aye aye
[00:40:43] <SWPadnos> for many HAL components though, the naming thing exists now
[00:40:51] <tom3p> ?
[00:41:03] <SWPadnos> loadrt mycomp names=fred,wilma,barney,betty
[00:41:15] <SWPadnos> that's instead of count=4
[00:41:23] <tom3p> oh you were serious! i thought you were wishing, cool
[00:41:34] <SWPadnos> no, not wishing
[00:41:36] <SWPadnos> heh: )
[00:41:50] <tom3p> thx, i didnt know that
[00:41:56] <SWPadnos> sure
[00:42:01] <SWPadnos> (though it's in the manuals)
[00:42:04] <SWPadnos> silly
[00:42:20] <tom3p> ok, its in the silly manuals, thx
[00:42:23] <tom3p> :)
[00:42:25] <SWPadnos> heh
[00:42:28] <SWPadnos> manpages too
[00:42:39] <tom3p> try man comp
[00:42:41] <andypugh> awallin: You might find http://www.lathes.co.uk/latheparts/page9.html intersting.
[00:43:00] <SWPadnos> I think anyway - if you man and2 for example, it should show count=N|names=...
[00:43:07] <andypugh> It is possible that the chap who built your lathe was planning to make it into a camlock.
[00:43:21] <awallin> andypugh: thanks, I will have to take measurements on my spindle tomorrow
[00:44:59] <andypugh> And that Amazon chuck was expensive. Try eBay for good quality used ones. (a search for "Pratt Burnerd" for example.
[00:48:10] <andypugh> Right, time to sleep.
[00:49:10] <tom3p> if Valen comes in here tonight, somebody point him to http://filebin.ca/qovwvn/Angela_ETD.pdf its a paper on how to not use counterbalances ;) (use PID to do similar)
[00:54:01] <eric_unterhausen> tom3p, doesn't that use a spring? Valen was very upset that someone might suggest using a spring
[00:55:48] <Valen> guess my ears were burning
[00:56:30] <skunkworks> Jymmm: if you're using 1/4 plywood - my feeling would be you want them a foot on center.. A couple of toe-nailed screws would probably be enough. (again I am an overdoer and I would use thicker substrate - also I would let the angles brace into the other boards.)
[00:56:56] <skunkworks> also - you would need a board across the front or your going to have some wavy shelves.
[00:57:10] <eric_unterhausen> Don Streit got a batch of references in that thesis, may he RIP
[00:57:10] <Jymmm> I'llbuild a frame 8' by 12" for the ply to lay on, just not sure on the braces
[00:57:24] <Jymmm> diagonal
[00:58:30] <skunkworks> your other option is to make some small plates (like truss plates out of 1/4 plywood for gussets(sp))
[01:04:21] <Jymmm> skunkworks: I'm going to see what HD has for 2x4 metal brackets
[01:05:26] <skunkworks> or buy some ;)
[01:06:22] <Jymmm> no, those galvanized things they now use during framing
[01:13:43] <SWPadnos> those suck
[01:14:27] <SWPadnos> joist hangers are OK, but those flat plates with the pointy things sticking out (pesudo-nails) are a royal PITA to use by hand
[01:21:23] <Valen> how do you mean?
[02:00:49] <Jymmm> SWPadnos: No, not the nail plate. They only had 4" 45 deg anyway, I needed 2"
[02:01:03] <Jymmm> well 4" 6" and 8"
[02:01:31] <SWPadnos> ok
[02:01:36] <SWPadnos> man. this is sad
[02:01:47] <SWPadnos> my phone has a faster upload speed than my home DSL
[02:02:10] <SWPadnos> and close to 1 MBit/sec download speed too (in my basement)
[02:02:34] <eric_unterhausen> hacking the cell tower has its advantages
[02:03:59] <Jymmm> I took a closer look, the existing braces are screwed in from front and top
[02:04:20] <eric_unterhausen> not really surprising that DSL stinks most of the time considering how low the bandwidth is on the lines
[02:05:29] <Jymmm> I gave 18mbps on dsl
[02:05:31] <Jymmm> have
[02:05:59] <SWPadnos> one day, I'll have the time to call my ISP and see if the 16MBit service is available here yet
[02:07:51] <dan1mal_garage> wow my z axis just went wacky and my machine crashed
[02:07:58] <dan1mal_garage> grrr
[02:09:37] <dan1mal_garage> hmm my z axis isnt moving at all
[02:10:27] <dan1mal_garage> hmm now it is
[02:10:31] <eric_unterhausen> hmm
[02:10:32] <dan1mal_garage> hardware issue
[02:10:54] <dan1mal_garage> i had to unplug my power supply for a second
[02:11:04] <dan1mal_garage> drive froze
[02:11:18] <dan1mal_garage> crap
[02:11:25] <eric_unterhausen> what control do you have on it now?
[02:11:38] <dan1mal_garage> emc2
[02:12:05] <dan1mal_garage> this is my mill, it's already converted
[02:12:16] <eric_unterhausen> geckos?
[02:12:23] <dan1mal_garage> no, leadshine
[02:12:28] <SWPadnos> oops
[02:12:36] <SWPadnos> new model or older gecko clones?
[02:12:40] <dan1mal_garage> geckos were too small
[02:12:49] <dan1mal_garage> new
[02:12:55] <dan1mal_garage> m880a
[02:13:11] <SWPadnos> ok
[02:13:13] <dan1mal_garage> this is the first time i've had an issue
[02:13:17] <SWPadnos> have you ever bought a stereo?
[02:13:37] <dan1mal_garage> i prefer mono
[02:13:40] <SWPadnos> heh
[02:14:07] <SWPadnos> there's a difference between Emerson watts and Yamaha watts - same with motor drives
[02:14:19] <dan1mal_garage> yea
[02:14:37] <eric_unterhausen> they were supposed to have standardized their watts back in the '70s sometime
[02:15:21] <dan1mal_garage> could be that they overheated
[02:15:27] <SWPadnos> is that RMS, peak, or my favorite "PMPO" (which I think meant "peak max power output" - ie the instantaneous peak)
[02:16:21] <eric_unterhausen> much more interesting is PMPOWS
[02:16:58] <dan1mal_garage> i upped the microsteping, i wonder if they're working harder
[02:17:05] <SWPadnos> shouldn't be
[02:17:47] <dan1mal_garage> i also upped the velocity and acceleration now that i think of it
[02:17:57] <SWPadnos> heh
[02:18:13] <dan1mal_garage> the enclosure seemed a little warm inside
[02:18:25] <dan1mal_garage> might be time for a fan
[02:18:42] <dan1mal_garage> what bugs me is the overload light wasnt on
[02:20:12] <dan1mal_garage> hmmm yea i re-routed some wiring so i could close the enclosure door all the way
[02:20:28] <dan1mal_garage> i bet that was the straw that broke the cammel's back
[02:20:42] <dan1mal_garage> less air flow
[02:22:16] <dan1mal_garage> well it works now that i unplugged it and plugged it back in. I guess i'll throw a fan on there to see what happens
[02:48:11] <dan1mal_garage> fan is installed
[02:48:35] <dan1mal_garage> 100cfm dayton, should keep them nice and cool
[02:49:46] <tom3p> Valen did you get the paper?
[02:50:13] <dan1mal_garage> i wish i could put a thermostat on it
[02:57:24] <tom3p> Valen: "This thesis explores the PID control of equilibrated systems, and compares the results to
[02:57:24] <tom3p> the PID control of a common method of equilibration, the mass counterweight."
[02:57:24] <tom3p> Through modeling, simulating, and testing of the two systems, the equilibrated
[02:57:24] <tom3p> system response was found to be superior to the mass counterweight in measures of
[02:57:24] <tom3p> settling time and peak overshoot.
[02:57:31] <tom3p> http://filebin.ca/qovwvn
[03:35:35] <tom3p> where's the code behind pyvcp widgets?
[03:38:15] <SWPadnos> now *that* is a darned good question
[03:40:12] <SWPadnos> I think most of it is in lib/python/pyvcp_widgets.py
[03:47:52] <tom3p> yep, i just chgd the text size on dial widget ( was too damn big )
[03:48:53] <tom3p> well its in yourripdir/lib/python/pyvcp_widgets
[03:49:05] <tom3p> thx
[03:49:29] <SWPadnos> yes - note the lack of a prepended "/" :)
[03:51:25] <tom3p> ooh a supository question
[03:51:53] <SWPadnos> I don't know nothin' about suppositories
[04:15:03] <MattyMatt> dan1mal_garage: , is there a PC mobo in the cabinet?
[04:17:40] <MattyMatt> nm. a modern speed controlled 12V fan couldn't be scaled to a mains one
[04:20:41] <MattyMatt> assuming you are using a mains fan, of course
[04:34:21] <MattyMatt> can an SCR be switched at pwm rates?
[04:47:47] <eric_unterhausen> wish I could find a service manual for my AB/Giddings/Electrocraft drives
[04:59:54] <dan1mal_garage> matty, no, there isnt a mobo in there
[05:00:03] <dan1mal_garage> just a power supply and the drives
[05:00:16] <dan1mal_garage> the fan is 110v though
[05:01:23] <dan1mal_garage> i could probably get a temp probe and make it turn the fan on and off via emc though
[05:02:05] <dan1mal_garage> it'd be cool if i could do a variable speed setup with it, but i think that would be expensive to do
[05:23:44] <jimbo655> how do you setup the touchy inteface for 800X600?
[08:21:20] <Dave911_> Dave911_ is now known as Dave911
[09:12:44] <MarkusBec_away> MarkusBec_away is now known as MarkusBec
[09:50:15] <MattyMatt> this thing wants to be 2 axis http://cgi.ebay.com/Delta-drill-press-17-Bench-top_W0QQitemZ140365195418
[09:53:51] <MrSunshine> huh ? :)
[10:24:17] <piasdom> g'mornin all
[11:11:01] <MrSunshine> stuff like full radius mills or whatever they are called (round tip on an endmill) can they be plunged into a materia l?
[11:11:58] <MrSunshine> ball nose end mill
[11:27:35] <christel> [Global Notice] Hi all, we appear to be having some connectivity issues with our main US hub, as a result of this we are temporarily without services, if this affects your channel please contact staff in #freenode for assistance. We're looking into the issues as we speak. Thank you for your patience.
[11:46:39] <Valen> echo
[11:54:34] <Pilotltd> hi guys - trying to install dev pacjkage from git, have followed instructions and getting the following error
[11:54:38] <Pilotltd> root@steve-desktop1:/home/steve# cd emc2-dev root@steve-desktop1:/home/steve/emc2-dev# git pull --rebase Current branch master is up to date. root@steve-desktop1:/home/steve/emc2-dev# cd src root@steve-desktop1:/home/steve/emc2-dev/src# ./autogen.sh ./autogen.sh: line 6: autoconf: command not found ./autogen.sh: line 9: autoheader: command not found root@steve-desktop1:/home/steve/emc2-dev/src#
[11:55:43] <celeron55> you have to install autoconf/autotools
[11:56:11] <celeron55> or whatever it happens to be called in your package manager
[11:56:47] <micges_work> Pilotltd: http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Installing_EMC2#On_Ubuntu_with_EMC2_package_already_installed
[11:57:10] <Pilotltd> thanks
[12:15:31] <christel> [Global Notice] Hi all, we're having some major issues with connectivity at the DC hosting one of our hidden hubs, I'm going to re-route around it, which will cause about twice as much noise as the splits already made. Apologies for the inconvenience.
[12:35:51] <awalli1> hi, does anyone have a link on how to connect two switched-mode powersupplies in parallel? for getting twice the current
[12:36:20] <awalli1> I remember there was a pic somewhere with diodes or smthn. so that the two regulator circuits don't start to compete or oscillate or whatever
[12:51:41] <numen_> re
[12:52:18] <numen_> awalli1 you can connect the gnd together and the diodes in the positive lines
[14:00:27] <MrSunshine> i love having a cnc mill more and more .. how can someone that like fabricating stuff not have one? :)
[14:00:36] <MrSunshine> its a small price to pay for the accuracy it gives =)
[14:01:02] <MrSunshine> mine has been about 1500$ so far and thats including endmills etc
[14:01:10] <MrSunshine> need alot more mills tho :P
[14:06:02] <mikegg> is there any way to make comp look where g++ normally looks for header files?
[14:06:12] <mikegg> i
[14:06:43] <mikegg> i've got a program written but it's using a lot of libraries that are not in the /usr/src/emc2/ directory
[14:07:27] <mikegg> or is there some other reason it doesn't look there to begin with
[14:07:28] <mikegg> ?
[14:07:39] <mikegg> i'm starting to wonder if this is going to work at all
[14:08:19] <mikegg> err /usr/include/emc2/ rather
[14:31:15] <SWPadnos> mikegg, are you trying to make userspace or realtime components?
[14:31:29] <SWPadnos> (hopefully userspace, since you can't use C++ in the kernel)
[14:31:56] <mikegg> hmm. ultimately, the program i'm writing will function as a tool probe
[14:32:07] <mikegg> which would be realtime?
[14:32:14] <SWPadnos> theoretically, that should b realtime, yes
[14:32:26] <SWPadnos> s/b/be/
[14:33:41] <SWPadnos> there are also many libraries that can't be used in kernel, so it may not be necessary for comp to have additional include paths
[14:34:21] <tlab> tlab is now known as tlabaway
[14:34:51] <mikegg> but I could write a userspace function that uses C++ to control a bar graph with pyVCP or something?
[14:35:07] <SWPadnos> no
[14:35:14] <mikegg> hm
[14:35:15] <SWPadnos> well, sort of
[14:35:41] <SWPadnos> userspace components don't talk to each other except via HAL pins, so you can't use pyvcp from within another component
[14:36:09] <SWPadnos> but you can make a HAL file that loads both pyvcp and your component and connects their pins together
[14:37:11] <mikegg> so how do I compile my component? because comp --install fails all kinds of different ways
[14:37:28] <mikegg> and I haven't even started with the code, just the #include stuff
[14:38:04] <SWPadnos> uh - the first thing I'd look at is whether you really need all those includes :)
[14:38:27] <mikegg> hmm. definitely yes.
[14:39:02] <SWPadnos> next, you can look at what actually needs to be done to compile your program - if comp won't do it for you, you may need to add your code to the emc2 make system or look into how to compile an external module against EMC2
[14:39:22] <mikegg> wow this is so far over my head
[14:39:47] <mikegg> I can compile it with g++ !
[14:40:22] <SWPadnos> ok, that's another avenue - make it work without emc2, then modify it to work with emc2
[14:40:58] <mikegg> right, it already works without EMC2. it
[14:41:18] <mikegg> I just need the program to tell EMC2 whether or not tool touch has occured
[14:41:46] <mikegg> and maybe have EMC2 tell the program how fast the spindle is going...but that can wait
[14:42:05] <SWPadnos> ok. that needs to be realtime, which means it can't be c++ code, which means that you shouldn't need g++ to compile it
[14:42:15] <mikegg> cripes
[14:42:31] <SWPadnos> can you pastebin the first bit of the program?
[14:42:31] <mikegg> the libraries i'm need aren't real time
[14:42:41] <SWPadnos> well, that's a problem
[14:46:11] <tom3p> i got the 'sort-of-edm' hal axis running between limits using analog input for velocity.
[14:46:11] <tom3p> when it hits upper limit, it can move back inside the bounds (only neg dir allowed at top & similar for the bottom limit)
[14:46:11] <tom3p> the upper limit would be arrived at if there was a long lasting short, and if cleared, it could advance
[14:46:11] <tom3p> the lower limit is like the finished dimension, and the tool can dwell there while sparking out BUT could retract for a bit of dirt :)
[14:58:21] <SWPadnos> coolness
[14:59:42] <skunkworks_> SWPadnos: feeling better?
[14:59:46] <SWPadnos> yep, mostly
[18:51:14] <issy> hi all
[18:52:05] <MattyMatt> yow
[18:52:21] <MattyMatt> did you fix your homing?
[18:53:55] <MattyMatt> I'm not sure how I'd handle twin leadscrews. by preference I'd tie them together with a toothed belt and just have one set of end & home switches
[19:24:12] <skunkworks_> heh - that is how I am thinking of doing it... mainly because I am lazy.
[19:26:31] <skunkworks_> dad found a piece of cast iron about 18X26X1... the machine shop here is going to mill it flat/square and drill a bunch of holes in it 1 inch on center.
[19:27:12] <skunkworks_> it will be the table of the circuit board mill.
[19:28:14] <bill20r3> nice.
[19:28:39] <skunkworks_> he thinks it was the weight above the rear wheels of an old van.
[19:28:59] <bill20r3> that way you can mill pcb's while driving in the snow.
[19:29:08] <skunkworks_> heh
[19:32:45] <skunkworks_> after they get done with it - I will see how flat it is.. might find local shop that can grind it flat. (we don't have a grinder big enough)
[19:33:42] <MattyMatt> the machine can flatten its own table, surely
[19:34:17] <MattyMatt> all nighter with a slow feed endmill
[19:35:48] <skunkworks_> most likely I will be milling on a spoil board of some kind.. so that can be flattened.
[19:38:38] <MattyMatt> I'll probably use one of those, just to keep the tool out of the nuts holding the table on. a bit of wood is a bit of wood :)
[19:41:12] <MattyMatt> I made a nasty leadnut today out of 2mm steel sheet. I reckon the worst it can do is wreck the screw which costs ~$3 per meter
[19:46:43] <MattyMatt> If I get jiggy wid it, I could be firing this up by tomorrow night
[19:58:16] <bill20r3> nah nah nah nah nah nahhhhh
[20:35:09] <ries> hey all, I have a question... if I would search for a store to buy transformers (toroidal) in teh miami area, how/where should I find such a store?
[20:35:45] <awallin> ries: are you sure you don't want a chinese switched-mode PSU? might be cheaper, smaller, and lighter
[20:36:12] <ries> awallin: that's fine we me to, as long as it can drive my stepper motors (5 of 4Amp each)
[20:36:29] <ries> But i have such a hard time finding a store where I can buy it... I cannot buy online because I am there for a holliday next week
[20:36:55] <awallin> I just got two 48V 7A supplies from a chinese ebay seller. free shipping (albeit slow)
[20:37:13] <awallin> how many volts and how many amps do you need?
[20:37:31] <ries> an dthat's my problem.. I am just in Floriday (miami/ key west) for 6 days and then heading back to hom (Ecuador)
[20:37:41] <ries> awallin: 38V / 300VA
[20:38:01] <awallin> ok
[20:38:13] <awallin> sorry I've never been to florida....
[20:38:49] <ries> awallin: np...
[20:39:05] <ries> I am trying to google it up, but my god, google is bad nowdays for searching such a thing
[20:41:15] <ries> if I search for 'electronics store miami' then google comes up with appel.com :s
[20:43:14] <mozmck_work> don't know about any stores in Florida, but could you have a ps or transformer shipped to where you will be?
[20:43:40] <archivist_emc> try the user mailing list, there are three emc users in Florida
[20:44:53] <ries> mozmck: I life in a country where shipping is very hard to do due to customs fraud
[20:45:28] <mozmck_work> I mean have the ps shipped to florida
[20:45:48] <mozmck_work> if that is possible...
[20:48:45] <tom3p> ries: maybe http://www.mpja.com/ google it ( he is in florida )
[20:48:57] <ries> Looking... thanks
[20:49:10] <ries> I just noticed I need to serach in google for electronic components to get better matches
[20:50:03] <tom3p> they wont be light, not 1kw
[20:51:29] <ries> mozmck: I don't want to take the risc shipping it we booked two days in key west, after that we will just drive around and find nice places
[20:52:29] <mozmck_work> I see. mpja is about 5 hours from key west it looks like...
[20:52:32] <ries> Would something like this work? http://www.mpja.com/prodinfo.asp?number=16490+PS
[20:53:55] <ries> may be I should buy two of these : http://www.mpja.com/prodinfo.asp?number=13657+PS I can drive 2 steppers with each one...
[20:55:38] <mozmck_work> ries: that would probably work. we used two of the 24v models in series to get 48v to run systems with 4 620 oz/in steppers at around 3.2 amps each.
[20:56:58] <tom3p> maybe he can ship to your hotel (if you want to hand carry stuff)
[20:57:39] <ries> tom3p: the things is that we will be moving around
[20:57:49] <ries> I know where I will stay tomorrow and the next day, but then I am not sure
[20:58:22] <tom3p> ries: google 'miami electronic surplus' lotsa stuff
[20:59:58] <ries> My motors are max 4Amp but I calculated 2/3 of total power consumption giving it around 300VA needed, I know one guy that has a 300VA transformer and works just fine
[21:00:17] <ries> tom3p: you see.. I am non native english speaker... google should know!!! thanks :)
[21:01:56] <MattyMatt> should be plenty of Spanish shops in Florida
[21:04:41] <MattyMatt> is 300VA bigger than you'd find in an audio amp?
[21:05:02] <MattyMatt> * MattyMatt goes dumpster diving even on holiday
[21:07:26] <ries> MattyMatt: but I don't speak spanish!!!!
[21:08:50] <ries> MattyMatt: it's indeed also used in a power amp
[21:19:12] <tom3p> http://www.yellowbot.com/tags/electronicparts/Miami,%20FL%2033172/page1.html nice map with lots stores in small area
[21:20:15] <ries> thanks again tom
[21:21:18] <celeron55> i guess chances of finding one from one of those are 100%
[21:31:53] <cradek> "7 days warranty against DOA and functionality"
[21:49:55] <issy> hi all
[22:14:10] <dan1mal_garage> hi
[22:14:56] <jt-plasma> hi
[22:16:28] <jepler> * jepler measured his spindle speed with a PWM LED. It is about 18krpm unloaded.
[22:17:58] <jt-plasma> nice
[22:19:23] <tom3p> an led photointerrupter reported 18000 pulses per minute? ( having trouble understanding pwm led )
[22:21:23] <jepler> The AVR's PWM generator allows setting the TOP value, which changes the PWM frequency.
[22:22:01] <jepler> so I made an LED be on for a fixed time, then off for a variable time
[22:22:02] <alex_joni> MMTB people buying tv's: http://www.koelnmedien.de/web/bilder/panasonic-103/panasonic-103-5.jpg
[22:22:25] <jepler> then I shined the LED at the turning spindle, which has a black mark at one spot
[22:22:41] <jepler> I varied the off time until the mark stayed stationary
[22:22:52] <tom3p> a stroboscope :) cool
[22:22:59] <jt-plasma> a strobe tach
[22:23:07] <jepler> then I used my scope to measure the on+off time and that gives speed in RPM
[22:23:12] <jepler> yeah, exactly
[22:23:16] <jepler> except I used more words to explain it
[22:23:51] <jt-plasma> I tend to simplify things :0
[22:25:01] <jepler> actually I could also directly read the PWM registers but I didn't get the answer I expected; it was off by a factor of 4 as it turns out
[22:25:10] <jepler> I read the datasheet again on PWM and now I understand why
[22:29:51] <jt-plasma> * jt-plasma is glad he picked up all those 6-32 screws the electricians dropped while building destroyers back early 70's
[22:31:08] <dan1mal_garage> 70's?
[22:31:17] <jt-plasma> yea
[22:31:29] <dan1mal_garage> your aging yourself!
[22:31:30] <jt-plasma> I'm a veteran cosmic rocker
[22:32:04] <jt-plasma> age is only a number that I do not care about
[22:32:21] <dan1mal_garage> ditto
[22:32:30] <dan1mal_garage> however i wish i was still a teenager
[22:32:40] <jt-plasma> LOL
[22:33:03] <dan1mal_garage> this grown-up stuff is for the birds
[22:33:16] <tom3p> "old age aint fer sissies"
[22:33:18] <jt-plasma> as long as I'm reasonably healthy and can maintain my gravitational attraction at a comfortable level I'm happy
[22:34:29] <dan1mal_garage> i'm not looking forward to 30
[22:34:53] <SWPadnos> youngster
[22:35:06] <tom3p> forward? are you Dr. Who or Merlin ?
[22:35:17] <tom3p> (gets younger as time passes )
[22:35:28] <dan1mal_garage> ha
[22:35:32] <dan1mal_garage> i'm 28
[22:35:41] <dan1mal_garage> still got a couple years
[22:35:56] <dan1mal_garage> er a year and a half
[22:36:54] <dan1mal_garage> anyone know anything about anodizing in here?
[22:37:01] <SWPadnos> some
[22:37:13] <jt-plasma> it's electric
[22:37:42] <dan1mal_garage> i'm anodizing some parts right now and the thinner parts seem to be anodizing, but the thicker sections arent there yet
[22:38:27] <dan1mal_garage> any idea why?
[22:38:27] <SWPadnos> do the thin parts also have much lower surface area?
[22:38:48] <dan1mal_garage> sorry, it's all on the same part
[22:38:54] <SWPadnos> ah
[22:38:59] <SWPadnos> current density
[22:39:14] <dan1mal_garage> i have multiple parts in the tank, all about the same size, all with the same issue
[22:39:28] <dan1mal_garage> too little you think?
[22:39:40] <dan1mal_garage> not enough amps?
[22:40:01] <SWPadnos> no - the smaller areas may have a higher electric field, which may cause more current to flow in those parts, which anodizes those areas faster
[22:40:24] <dan1mal_garage> so it just needs to cook a little longer, basically
[22:40:25] <SWPadnos> once they get anodized, they're insulators, so the other parts will start to get affected more
[22:40:27] <SWPadnos> yes
[22:40:31] <dan1mal_garage> gotcha
[22:40:33] <SWPadnos> probably anyway
[22:40:49] <dan1mal_garage> tank temp isnt too hot, might be a little too cool actually
[22:40:55] <dan1mal_garage> probably low 60's
[22:41:06] <dan1mal_garage> i have good agitation
[22:41:28] <SWPadnos> anodizing more or less requires a certain number of amp-seconds per square inch. when those amps flow through that square inch doesn't matter too much
[22:41:49] <dan1mal_garage> gotcha
[22:42:09] <SWPadnos> oh - actually temperature could also be a factor - the thinner parts might actually heat up a little due to cyurrent flow, which might cause the reaction to happen faster as well
[22:42:33] <SWPadnos> I'm just speculating here - I don't anodize, I just make controls for large power supplies for people who do :)
[22:43:18] <dan1mal_garage> oh i got a good question for ya then... how hard is it to make a way to adjust the current variably?
[22:43:32] <dan1mal_garage> i have power supplies from machines that are a bit beefier than mine
[22:44:34] <dan1mal_garage> i'd like to maybe use one for anodizing
[22:48:54] <tom3p> theres lotsa info on the web for diy anodizing, but its as varied as diy bread baking.
[22:49:10] <dan1mal_garage> yea
[22:49:15] <dan1mal_garage> i get confused easily
[22:49:41] <tom3p> and i guess your materials are not aluminum
[22:50:57] <dan1mal_garage> they are, but they're 7075
[22:51:12] <dan1mal_garage> so half of what's on the web doesnt relate
[22:51:34] <tom3p> the thinner cross sections plate faster than thicker?
[22:51:39] <dan1mal_garage> yes
[22:52:03] <dan1mal_garage> which didnt make sense to me since i thought it was all based on surface area, not thickness
[22:52:43] <dan1mal_garage> but SWPadnos made some sense so i'll just run it a little longer and see
[22:55:27] <tom3p> SWPadnos: what does current density have to do with it? isnt the current 'absobtion' equal all over the part?
[23:18:38] <SWPadnos> tom3p, no, I wouldn't assume that current distributes evenly over the entire part, unless the part is a very simple shape
[23:19:23] <dan1mal_garage> yea, mine arent simple, they're bicycle chainrings
[23:19:34] <SWPadnos> hmmm. no, you'd probably needa somewhat complex shape (something like a parabola or something) to make the current even
[23:27:02] <tom3p> thx, it sounds impossible to get even effect, unless theres some saturation on the thin sections that lets the thicker catch up
[23:28:11] <SWPadnos> well, the anodizing occurs proportional to current flow, and it insulates as it goes, so as portions get anodized, they lose conductivity, and the process stops where it's "done"
[23:59:17] <MarkusBec> MarkusBec is now known as MarkusBec_away