#robotics Logs
Feb 10 2014
#robotics Calendar
03:08 GuShH_ http://cl.jroo.me/z3/h/J/k/e/a.baa-bike-ready-for-war.jpg
03:16 rue_shop3 german indinuity vs american day to day survival
03:29 doomlord_ lol
04:21 rue_shop3 ok, all the 120V wiring works on my new power supply
04:22 rue_shop3 I saved $4 making a panel mount usb connector
04:22 rue_shop3 (oooOOoooo)
04:23 rue_shop3 usb enabled, 2 channel power supply, I can control the outputs right now, so I'm thinking on what format to display data in
04:24 rue_shop3 I'm thinking plain text, so you can just plug a dumb serial into it and watch the numbers
04:34 rue_house http://eds.dyndns.org/~ircjunk/projects/newpower/p1050856.jpg
04:34 rue_house http://eds.dyndns.org/~ircjunk/projects/newpower/p1050857.jpg
04:34 rue_house http://eds.dyndns.org/~ircjunk/projects/newpower/p1050858.jpg
04:34 rue_house http://eds.dyndns.org/~ircjunk/projects/newpower/p1050859.jpg
04:35 rue_house http://eds.dyndns.org/~ircjunk/projects/newpower/p1050860.jpg
04:35 rue_house :)
04:36 rue_house armyofevilrobots, ^^
05:07 rue_house ooo I suppose I better isolate the usb or I'm gonna blow something up
05:14 rue_house I'll isolate at the rs232 levels
05:14 rue_house er the ttl levels
05:26 rue_house http://www.ebay.ca/itm/No-soliciting-Jesus-Thin-Mints-Vinyl-Decor-Wall-Lettering-Words-Quotes-Decal-art-/230917975632
05:26 rue_house hah
06:20 GuShH_ rue_house: haha that's great
06:20 GuShH_ although since I moved I haven't met any of these arseholes
06:22 GuShH_ used to get visited by the jehovah wittnesses every week
06:22 GuShH_ I once toyed with the idea of releasing my brother's dog on them among other bad things.
06:23 GuShH_ I even thought about adding a fake door bell button with a 10kv or so potential above ground
06:23 GuShH_ the way they talk all passive is what really freaks me out
06:23 GuShH_ they're brain washed coocoos
07:31 rue_shop3 its not so hard
07:31 rue_shop3 you just answer the door nakid and they never come back
07:33 sazawal I have a problem regarding the derivation of Pontryagin's Minimum Principle in Dynamic Optimization. Here are few pages from Applied Optimal Control (Bryson & Ho), see section 2.3 http://www.scribd.com/doc/206023314/Bryson-Pages?secret_password=1ivb0ucbrttkq4nj75lo . My question is: When we are taking variation of augmented objective function in equation 2.3.6., why are we not considering partial derivative of Hamiltonian with respect to time. It is p
07:33 sazawal ossible that Hamiltonian is not an explicit function of time in this case, but what happens if Hamiltonian is time dependent.
07:38 rue_shop3 so you think that a 24V fan is gonna make a big smoke about being run on 30V?
07:39 rue_shop3 sazawal, sorry, not real-world enough for me
07:40 sazawal rue_shop3, its alright
07:42 rue_shop3 sazawal, have you ever implemented a PID loop controller on a 8 bit 16mips microcontroller?
07:44 sazawal rue_shop3, No I have never really worked with controllers in robots. Though, I have done microcontroller programming. I guess, it won't be difficult unless practical things come into picture.
07:44 GuShH_ rue_shop3: why is the mcu relevant
07:44 GuShH_ ...
07:45 rue_shop3 GuShH_, well its harder to do on that than it is a 500Mhz ARM
07:45 rue_shop3 avrs cant run mathmatica
07:47 GuShH_ you can use pure ints
07:47 GuShH_ also what are you controlling
07:47 GuShH_ that requires fast response
07:47 GuShH_ don't say "a furnace burner"
07:47 rue_shop3 heh
07:47 rue_shop3 motor positioning
07:47 rue_shop3 I want to know who is using what techniques for preventing integrator windup
07:48 rue_shop3 I'm leaning towards good results 'turning it off'
07:49 GuShH_ free energy freak meets 3d printer? https://www.youtube.com/watch?v=o3t2390k5R8
07:50 e_shop3 expects a pedal powered repra
07:50 GuShH_ no, as in weird coils and SLAs free energy.
07:51 GuShH_ https://www.youtube.com/watch?v=ESeb-sPIFsA
07:51 GuShH_ .....
07:51 GuShH_ this is the result of marihuana overdose + internet ?
07:53 GuShH_ he's using 76W to get what, a few mAs?
07:53 GuShH_ do they have mental damage, literal brain damage...?
07:54 GuShH_ I would put them all in an island and forget they exist.
07:55 GuShH_ "produces power" my god.
07:55 rue_shop3 dont ask me, its past 5:30am and i'm still working on my power supply
07:57 GuShH_ my head hurts from watching that
07:59 rue_shop3 I'm seriously running out of steam
07:59 rue_shop3 I need to make atleast 2 brackets and i just cant get out of the chair
08:01 GuShH_ go to sleep
08:01 rue_shop3 I think its a better idea to go to bed first
08:01 ShH_ tucks rue_s
08:01 rue_shop3 I'm pretty darn close to this thing working
08:13 ShH_ kicks rue_s
08:13 GuShH_ wake up, finish the thing1
08:22 rue_shop3 falling asleep!
08:28 GuShH_ rue_shop3: that's ok, unless you dream with the angry sheep
08:29 GuShH_ the ones that didn't get counted last night!!
09:18 armyofevilrobots @rue_shop3 You work too late! Nicely done tho.
11:08 GuShH_ theBear: !! http://www.youtube.com/watch?v=QK8mJJJvaes LOL
13:51 rue_bed http://eds.dyndns.org/~ircjunk/images/dscn0151_relaybox.jpg
13:52 rue_bed armyofevilrobots, lacing is quick and easy, tidys things up really nice, I'm scorning myself for not having done it on the power supply so far
13:57 armyofevilrobots That looks awesome.
13:58 armyofevilrobots I usually use that plastic spiral wrap stuff, but that works well too.
13:58 armyofevilrobots Hell, I bet that the zipties are cheaper too.
13:58 rue_house :)
13:58 rue_house I decided to play oldschool, turns out its kinda important to use waxed string
13:59 rue_house sets it in place as you go
13:59 armyofevilrobots Ha, I thought those were zipties at first.
13:59 armyofevilrobots had to go back and look.
13:59 rue_house Waking up:|===30%===> |
13:59 armyofevilrobots SIGSEGV
14:00 rue_house yay for holidays
14:00 armyofevilrobots yarp
14:01 rue_house its a good thing I wasn't going too fast last night tho, I realized if I dont isolate the usb it'd probably blow up when plugged in
14:01 rue_house sweet, I found a todo list on the desk, and everything on its been done!
14:02 e_house croses them
14:02 rue_house mm keyboard getting tippy, better deal with paperwork
14:08 rue_house a search for vynal lettering on ebay brought me to the conclusion I should make a machine (plotter+cdwriter) to cut lettering out of electrical tape
14:23 rue_house http://www.aliexpress.com/item/10pcs-0-5m-USB-2-0-B-female-socket-panel-mount-to-USB-A-female-jack/1411467177.html
14:23 rue_house hmm for $2/project, it would add a usb connection to any project
14:24 rue_house could plug in a serial->usb on the other end..
14:27 GuShH_ rue_house: you didn't sleep much at all..
14:27 GuShH_ are you human?
14:27 e_house checks to see if anyone is looking and disposes of GuS
14:27 GuShH_ nice lacing though
14:27 GuShH_ haha
14:28 GuShH_ "just take me to the other side..."
14:28 rue_house turns out servicing laced stuff isn't that bad
14:28 rue_house cut/relace
14:29 rue_house I'v done it to a few network panels that were changed
14:30 rue_house golly gee, I have usb drives everywhere
14:32 GuShH_ oh found a pic of the finished motor rotor .. forgot to upload it the other day
14:33 rue_house you building a motor?
14:33 GuShH_ http://gushh.net/tmp/dscn5086f.jpg
14:33 GuShH_ no, the one I was refurbishing
14:34 rue_house oh with the open winding
14:34 GuShH_ the pitting is slightly felt as it spins... but I didn't want to reconstruct the contacts with solder and then have it smudge/short or fly apart
14:34 GuShH_ but I turned the contacts down on the lathe as you can see
14:34 GuShH_ they were very uneven
14:34 GuShH_ runs fine now
14:35 rue_house you can tell the difference yes?
14:35 GuShH_ of course
14:35 GuShH_ rue_house: I did say you were right it needed soldering
14:35 rue_house so it was open, not short, ok
14:35 GuShH_ but the heavy pitting... I don't think that happened in the 10 seconds it acted up
14:35 rue_house maybe the tablesaw I let decay out in the weather could have been saved
14:35 rue_house **oops
14:36 GuShH_ so now I'm waiting to source the only part left, a thrust bearing for the pump
14:36 rue_house tho iirc, it went till it completely blew up
14:36 GuShH_ called a bearing shop the guy didn't have a clue...
14:36 rue_house hah
14:36 rue_house china
14:36 rue_house whats the number?
14:36 GuShH_ no number
14:36 GuShH_ it's got like a phenolic body and 20 bearings
14:36 rue_house there is always a number
14:36 GuShH_ couldn't find it
14:37 rue_house ball bearing?
14:37 GuShH_ 90mm outside diameter 60mm inside
14:37 rue_house k
14:37 GuShH_ yes ball bearings but with a phenollic type ring
14:37 GuShH_ it's transparent like a pcb
14:37 rue_house how thick?
14:37 GuShH_ 3.5mm the phenollic part
14:38 GuShH_ I got the measurements on a piece of paper somewhere.. I even measured the balls radius among other things
14:38 rue_house http://www.aliexpress.com/item/Cheapest-100pcs-624ZZ-4x13x5mm-Deep-groove-ball-bearing-624zz-skateboard-bearings-cycling-rolamentos-CN0170/1322563973.html
14:38 rue_house not a bearing like that then
14:38 GuShH_ no, it's an open thrust bearing
14:38 rue_house error: null pointer
14:39 GuShH_ http://b2bimg.bridgat.com/files/TGU_bearing_51108_thrust_ball_bearing.jpg
14:39 GuShH_ see the middle part....
14:39 rue_house http://www.aliexpress.com/item/10-PCS-51100-10x24x9-mm-Axial-Ball-Thrust-Bearing-10mm-x-24mm-x-9mm/776053986.html
14:39 GuShH_ I could take a pic if you want
14:39 GuShH_ it's broken with 2 balls missing
14:39 GuShH_ like flyback.
14:39 rue_house *ouch*
14:39 GuShH_ HAHAHA
14:39 rue_house hmm
14:39 GuShH_ are the metal washers "races" ?
14:39 rue_house see, that one has a number
14:40 GuShH_ it doesn't have any, uses the surfaces of the pump
14:40 GuShH_ because it's got 3 pistons and an offset "platter"
14:40 rue_house eek
14:40 GuShH_ stainless steel
14:40 rue_house so you just need the inner bit
14:40 GuShH_ they're all the same these pumps :/
14:40 GuShH_ yep
14:41 GuShH_ I'll just head to the shop tomorrow with the broken bearing... by phone he couldn't tell me crap
14:41 GuShH_ it's an skf store
14:42 rue_house ok if I start browing alibaba again I'm gonna end up buying stuff...
14:43 GuShH_ actually it's 60mm od, 40mm id, found the paper.
14:43 GuShH_ similar to this but not quite http://www.skf.com/group/products/bearings-units-housings/ball-bearings/thrust-ball-bearings/single-direction/index.html?prodid=1610011108&imperial=false
14:45 GuShH_ I wonder why the "housing" on the original bearing wasn't metal
14:47 GuShH_ heh got an email from a guy all excited "I got the perfect recipe for gel flux!!!"
14:47 GuShH_ so nice when people share back :)
14:51 GuShH_ seems to work very nice based on the pics he sent me
14:51 GuShH_ might be worth a shot
14:59 GuShH_ darn that's like a few bucks for a whole gallon of gelled flux....
14:59 GuShH_ damn companies ripping us off all the time
15:05 rue_house that reminds me I need a kitty litter grinder for making greensand
15:05 rue_house GuShH_, you can bet its something standard, first question is if its metric or imperial
15:13 GuShH_ rue_house: bearing? metric
15:13 GuShH_ measures 60mm outside and it was made in germany with italian components
15:13 GuShH_ but a few components are from thailand as well....
15:13 GuShH_ hmm I should go to sleep
15:13 GuShH_ lathe is cutting nicely this 2005 alloy, love it
15:15 rue_house I manged to reduce the shaft of a drillbit yesterday on the lathe without it hardening on me
15:15 rue_house GuShH_, what mods you done on your lathe? :)
15:16 GuShH_ none really
15:16 GuShH_ thumb screw on the belt cover
15:16 rue_house no thumbnscrew for the belt door?
15:16 GuShH_ >_<
15:16 rue_house heh
15:16 GuShH_ I don't have a pic, it's rather small... but I knurled it
15:16 rue_house is a threading reverse on your list?
15:16 GuShH_ yeah
15:17 GuShH_ mostly to cut from chuck to tailstock with power feed
15:17 rue_house http://eds.dyndns.org/~ircjunk/projects/lathe/p1050158.jpg
15:17 rue_house yes?
15:17 rue_house http://eds.dyndns.org/~ircjunk/projects/lathe/p1050855.jpg <-- this is the latest one for me, I thought it wouild get in the way, but it dosn't and it makes it SO much nicer to work with
15:18 rue_house (its threaded in)
15:18 GuShH_ it looks like that, but yours is nicer I used a scrap piece which had a through hole, so that's why mine is uglier
15:18 GuShH_ is that a ... screwdriver handle?
15:19 GuShH_ I need to do that as well. the stock handle is too short
15:41 GuShH_ rue_house: lol check out this tiny thing http://mla-s2-p.mlstatic.com/torno-paralelo-combinado-con-fresadora-para-matriceria-11257-MLA20040945396_012014-F.jpg
15:41 GuShH_ what an abomination
15:42 GuShH_ although it does have quite some swing
15:45 rue_house yea, I was punchingout my wrist too much
15:46 rue_house its soft, that whats nice
15:46 rue_house and dispite what you might think, its not at all in the way
15:46 GuShH_ I didn't think.
15:46 GuShH_ The big pro grade quick change toolposts have massive handles
15:46 GuShH_ too expensive for me though
15:46 GuShH_ like half of what I paid for the whole lathe.
15:47 rue_house the quickchange posts are great, BUT you need a holder for each bit you regularily use for it to be of bennifit, and that costs like a million bucks
15:47 GuShH_ yep
15:47 GuShH_ it's too expensive for me.
15:48 GuShH_ then again I only use 3 tools for most things
15:48 rue_house I have about 5 cutting bits I use on a regular basis, re-aligning them is annoying as hell
15:48 GuShH_ yup
15:48 rue_house *but* I saw an idea where someone made a guage they just set on the crossside
15:49 GuShH_ for angles using straight blades I use a sharpie on the toolpost "base"
15:49 GuShH_ so I can change the angles rather quickly without fuzzing about
15:49 GuShH_ of course it's a bit of a "turret lathe setup" in that it's not very precise to do this
15:49 GuShH_ wish I could find a cheap turret lathe with no missing parts...
15:50 rue_house I made a lamppost for the old lathe I was building, I been tempted to put it on the new one
15:50 rue_house lampposts adjust nice and quick
15:51 GuShH_ old school :p
15:51 rue_house need to find some big metal and make a press too
15:51 GuShH_ with a big hydraulic bottle jack?
15:55 GuShH_ heh the gel flux guy is 16, and complains just as much as I do... figures, he lives in the same country.
15:55 rue_house yea I have a 20 ton one
15:55 GuShH_ neat
15:55 GuShH_ I'd like one of those
15:56 GuShH_ making the press is relatively simple once you've got the jack
15:56 rue_house had to lift part of the hosue, it did a fine job
15:56 GuShH_ the dies are not too hard
15:56 rue_house and getting the lathe in position too
15:56 GuShH_ making brackets and whatnot turns into a simple task with a nice press
15:56 rue_house broaching seems to be the latest craze
15:56 GuShH_ lol
15:57 rue_house I just got a hydraulic pump yesterday, I'm into makeing a gear broacher
15:58 rue_house http://www.youtube.com/watch?v=_j6KQ96YZM0
15:58 rue_house :)
15:58 rue_house pick and metal gear and start making plastic ones
15:59 rue_house thats such a nice cutting sound
15:59 GuShH_ I have a hydraulic pump and a hole punching die
16:00 GuShH_ heh it does sound nice, too bad that's a rather expensive machine
16:00 rue_house nowonder, its cutting plastic
16:00 rue_house I'm sure I can make one
16:00 GuShH_ nylon
16:00 GuShH_ it would sound similar with aluminum though
16:01 GuShH_ just like when you get the depth and feed just right on the lathe, sounds awesome
16:01 GuShH_ also sfm...
16:01 GuShH_ I bet you could repurpose an old engine to cut MULTIPLE gears at the same time.
16:01 GuShH_ how's that for recycling
16:02 rue_house ah, the crows FINALLY found the peanuts
16:02 GuShH_ crow problem?
16:03 GuShH_ I could shoot 'em down for ya if they're a problem .... but we live a few miles apart.
16:03 GuShH_ me doesn't feel anything when it comes to dipshit animals
16:03 GuShH_ err /me!
16:03 rue_shop3 hmm, yaknow, I dont think I need as much force as I was expecting
16:04 GuShH_ you need inertia
16:04 rue_shop3 I been trying to get crows to start comming around so I can start training them to bring me money
16:04 GuShH_ wat
16:04 rue_shop3 4 step program to get them to bring you coin for peanuts
16:05 rue_shop3 http://i733.photobucket.com/albums/ww340/CreviceReamer/GRIZZLY%20G0602%2010x22%20LATHE/G0602%2010X22%20MODS%20and%20IMPROVEMENTS/100_4374-copy_edited.jpg
16:05 rue_shop3 mmmm camlock
16:05 GuShH_ fresh from the crow bank
16:05 rue_shop3 http://www.cnccookbook.com/CCLatheTailLock.htm
16:05 rue_shop3 http://www.dennisatwood.com/projects/tumbler-reverse-for-10x22-lathe/
16:05 rue_shop3 mmm reverse
16:06 rue_shop3 prefer to feed AWAY from the chuck
16:06 rue_shop3 :)
16:06 GuShH_ I don't dare do the camlock mod yet
16:06 GuShH_ I know I will mess it up
16:06 rue_shop3 I dont like either of those, so I'm gonna use the spirit of them
16:07 GuShH_ the bigger version of these lathes does come with a camlock
16:07 GuShH_ darn chinese.
16:08 rue_shop3 yea
16:08 rue_shop3 I found what I think is the origional manuf, I'm asking for 'replacement parts'
16:09 rue_shop3 see how far I get
16:09 rue_shop3 they seem to be the factory that makes king and grizley
16:09 GuShH_ there's one or two factories IMO
16:09 rue_shop3 my drillpress is gradually aquiring a fully featured led worklight
16:09 GuShH_ and probably only one place doing the beds
16:10 GuShH_ bah I need a milling machine but I can't afford the new prices
16:10 ShH_ s
16:10 rue_shop3 I'm pretty convinced, after spending some time on alibaba ("mini lathe") that most of the parts are generic
16:10 GuShH_ yeah
16:10 rue_shop3 GuShH_, I been looking at my welder and "cross slides"
16:11 rue_shop3 a half descent cross slide seems to go for ~$300
16:11 ShH_ doesn't think he can build a proper milling machine at
16:11 rue_shop3 then you just have to deal with vert.
16:11 GuShH_ vert needs to go up and down, or the cross slide does.
16:11 GuShH_ depending on the design
16:11 GuShH_ knee mills often do both!
16:11 rue_shop3 oooo I got a huge... foot with a huge post on it
16:11 GuShH_ the ones with the fancy rotary heads
16:12 rue_shop3 you can make a lot with pipe
16:12 GuShH_ it has to be all solid stock... otherwise it would flex like crazy
16:12 rue_shop3 I LOST MY DAMN DRILLPRESS CHUCK AND I STILL CANT FIND IT
16:12 GuShH_ call it, maybe it'll come
16:13 rue_shop3 I'm using a bar and flatblade, but the trick is getting old
16:13 rue_shop3 I know for sure, its sitting on something flat...
16:15 GuShH_ I like the camlock, not so much the block he used
16:15 GuShH_ I would try to make it look stock
16:16 GuShH_ rue_shop3: here's a functional mod I plan to do for the tailstock... way wipers
16:16 GuShH_ mine doesn't have any on the tailstock.
16:16 GuShH_ might end up using M3 and tiny brackets to hold the felt wipers
16:17 rue_shop3 yea I dont like that block either, it dosn't sit right
16:18 GuShH_ hmm no t slots on his cross slide... odd
16:19 rue_shop3 GuShH_, would you buy me like 50-100 M3x0.5 nuts and send them to me if I send you money?
16:19 rue_shop3 trying to get metric stuff here is just stupid
16:19 GuShH_ I would but prices are shitty here... as is the shipping, surely china is cheaper
16:20 rue_shop3 your in aus are you?
16:20 GuShH_ argentina
16:20 rue_shop3 hah pff, nevermind
16:20 GuShH_ it's all metric here... but china is cheaper.
16:20 SlaveToTheSauce http://stores.ebay.ca/northern-supply-2012 i use this guy rue_shop3
16:20 rue_shop3 anyone in australlia can go to a nut-and-bolt shop, get 100 and ship them for less than I get 10 in here
16:21 rue_shop3 hmm
16:21 GuShH_ metric nut and bolt trafficking
16:21 GuShH_ haha
16:22 rue_shop3 for absolutly no good reason I'm using metric on this project, and I'm runningout of nuts fast
16:22 SlaveToTheSauce they do combine shipping so get a variety of stuff
16:22 GuShH_ http://www.ebay.ca/itm/Stainless-Steel-M3-X-5-A2-Hex-Nut-18-8-304-25-Pack-/171128600871?pt=LH_DefaultDomain_2&hash=item27d80f3927
16:23 GuShH_ that's reasonable
16:23 SlaveToTheSauce ya way cheaper than retail
16:23 rue_shop3 price looks good, but I'll ask for a shipping adjustment
16:24 rue_shop3 cool! thanks
16:25 SlaveToTheSauce fwiw in my last order i got 21 items and shipping came to $8.45
16:26 GuShH_ is it ballpark or by weight
16:26 SlaveToTheSauce i am not sure, probably was done at a loss though considering canada post's rates keep going up
16:26 rue_shop3 my ability to identify screws by looking at them is un-nerving me
16:27 GuShH_ rue_shop3: seems I'm getting better finishes now http://gushh.net/tmp/dscn5096f.jpg still not perfect though (it's a blank for a project I'm working on, needs threading and an o-ring groove)
16:28 GuShH_ should run faster and with coolant to get a nicer finish I guess
16:31 GuShH_ that's a case where you can use only one tool for everything
16:31 rue_shop3 nice
16:31 rue_shop3 good luck on the threading
16:31 GuShH_ I threaded the previous part
16:32 GuShH_ but I messed up the length of the nozzle
16:32 GuShH_ so I had to start again.
16:32 GuShH_ 2005 threads very nicely at slow speeds with HSS
16:32 GuShH_ you just need a very sharp tool.
16:32 GuShH_ should be still set for 1.25mm pitch, I hope.
16:33 GuShH_ rue_shop3: also for a one-off, you can thread without power, since aluminum is so soft (but between centers always, with a dead center)
16:33 GuShH_ or live, if you have one
16:35 GuShH_ I cheat when threading... I start with an OD slightly bigger, then cut the thread to it's full extent, 90% it doesn't even turn once, so you reset and cut once again, every time you advance you are decreasing the OD, so that's one way to cheat.
16:35 GuShH_ using common angles on the compound
16:41 rue_shop3 I have a hone in the lathe tray
16:42 rue_shop3 GuShH_, makes ure the bit dosn't move between passes like mine did
16:43 rue_shop3 I suspect the axis I didn't use on the compound side, I should have locked it
16:48 rue_shop3 ok I need a whole room for keybaords
17:19 rue_house so, I have an automotive 5V usb charger(5.2V), modified with a series shottkey(~0.2V) running 5V for microcontroller, power led, and cooling fan (12V @ 5V)
17:19 rue_house I dont know how safe this is, being I'm running it on 30V
17:27 rue_house http://www.youtube.com/watch?v=XsCFze4zkzk this seems perfectly safe
17:28 rue_house what could go wrong?
17:37 rue_house http://www.youtube.com/watch?v=43N44ICyuEU
17:38 rue_house why am I getting ideas to try something like this with my lathe
18:06 SlaveToTheSauce rue_house: might be worthwhile to add a fuse and 6v zener
18:07 SlaveToTheSauce cause if the smps fails it will likely fail short
19:13 rue_shop3 didn't take me long to blow up a module :/
19:16 rue_shop3 these are current limited, shorting the output shouldn't (didn't before) hurt them
19:30 dumbass-afk didja have a overvolt/noise resistor-capacitor protection on the input?
19:38 rue_shop3 I put a wire across the output and the module blew up
19:38 rue_shop3 even at max setting it should stop at 5A
20:11 rue_shop3 :/ I reversed the - terminals on the outputs, when I shorted the output, the + of one module was dumped into the sense resistor of the other module, which couldn't shut it off
20:13 SlaveToTheSauce heh
20:14 SlaveToTheSauce you should either tie the -'s together or feed them with mutually isolated supplies
20:15 SlaveToTheSauce (or both)
20:16 SlaveToTheSauce i've been meaning to build something along the lines of what you're working on now but my dc supplies kind of scare me
20:16 SlaveToTheSauce even if it's only 12V a supply that can churn out 30A is still pretty unsettling
20:17 SlaveToTheSauce especially when the overcurrent protection consists of it letting the output voltage drop instead of just shutting down
20:18 SlaveToTheSauce would make a pretty decent accidental arc welder
20:22 rue_shop3 I'm working down the path of designing my own buck converters
20:23 rue_shop3 now that I have these modules wired right, they top out at 4A
20:23 rue_shop3 but it would just be a matter of time before soemthing foudn itself across the wrong terminals and blew antoher one up
20:23 rue_shop3 even half burt out, this is better than my old supply
20:24 rue_shop3 (1A 24VDC)
20:24 rue_shop3 this one is 4A 30VDC
20:24 rue_shop3 now I can make it so that I can use encoders on the controls and have usb control too
20:30 SlaveToTheSauce again, that's what fuses are for :)
20:30 SlaveToTheSauce or even polyfuses if you want to get super fancy
20:30 SlaveToTheSauce http://dx.com/p/273974
20:34 rue_shop3 as for the modules its using, I'v had it pushing ~60W continious for a while now and nothing is warming up much
20:34 rue_shop3 dont need the polyfuses, its self-protecting :)
20:34 rue_shop3 it would help if they had put the current sense on the + rail
20:35 rue_shop3 I still need to make sides and stuff for it, I can design a TL494 based converter in the meantime
20:39 rue_shop3 have you ever noticed how little axial play there is in the ACME threads of a descent quality C clamp?
20:40 Tom_itx never put an indicator on it
20:40 Tom_itx i bet it's not as good as you think
20:40 rue_shop3 its pretty darn good
21:32 rue_shop3 http://www.myford.co.uk/acatalog/ball1.jpg <--- hehe if I'm using encoders, should I make new handles for hte power supply?
21:33 dumbass-afk too pricey to use on a psu, i think
21:34 rue_shop3 I have a lathe!
21:35 dumbass-afk so you can make those handles!
21:36 rue_shop3 http://www.steves-workshop.co.uk/tips/lathetech/ballhandles/ballhandles.htm
21:36 rue_shop3 damn, nice trick
21:40 armyofevilrobots Heh, easteregg: in python...
21:40 armyofevilrobots from __future__ import braces
21:51 rue_shop3 ?
21:51 rue_shop3 sounds cute
21:52 rue_shop3 it would help with my free-the-whitespace-from-slavery act
22:02 rue_shop3 FOUND IT
22:03 rue_shop3 its painted yellow, I'v had this problem before
22:03 dumbass-afk if it was pink you'd haveto throw it away
22:05 rue_shop3 at work I use anti-theft paint on my tools, its pink
22:06 rue_shop3 some job sites require liberal application
22:06 rue_shop3 since I'v started using it I'v not really had anymore problems tho
22:24 MrCurious http://news.discovery.com/tech/robotics/giant-robot-directs-traffic-in-the-congo-140209.htm
22:25 rue_shop3 I cant telll how big it is
22:26 MrCurious article says "hulking"
22:26 MrCurious so must be at least 100'
22:29 robotustra_ :
22:29 robotustra_ )
22:32 rue_shop3 definitly over 100"?
23:27 rue_house http://autonopedia.org/crafts-and-technology/metalwork/metalworking-the-basics/metalworking-13-the-lathe/
23:27 rue_house I think I like this page
23:30 rue_house I'm half way thru and I'v learned 3 new things
23:51 MrCurious http://www.youtube.com/watch?v=xATBXWihiJU&list=PLAuiULxYBRkQVgwHj_gNuYlKHxBx9aydB