#robotics Logs
Mar 12 2014
#robotics Calendar
10:49 de-vri-es does anyone know where I can find the exact dimensions of the depthsense 325 camera?
10:49 de-vri-es also the positions of the lensen relative to the mounting holes, things like that
10:50 de-vri-es couldn't find it on the softkinetic website :(
11:49 GuShh_Lap2 rue_more: will etching of a heatsink in essence increase it's surface area?
11:50 GuShh_Lap2 would also shot peening do the same in theory?
11:50 GargantuaSauce that's an interesting idea
11:51 GuShh_Lap2 well I think they already anodize aluminum heatsinks for that reason
11:51 GuShh_Lap2 but I'm thinking caustic soda instead.
11:51 GargantuaSauce perhaps because aluminium oxide is an insulator?
11:51 GuShh_Lap2 I'm only thinking it's because of the surface area increase
11:51 GuShh_Lap2 in theory it is increasing!
11:52 GuShh_Lap2 any texturing should
11:52 GuShh_Lap2 of course it turns a nice polished surface into poop.
11:52 GuShh_Lap2 do I care to run a test?
11:53 Shh_Lap2 googles some papers on the sub
11:54 GuShh_Lap2 holy crap, ion beam texturing! the heck.
11:54 GargantuaSauce time to bust out the ol' particle accelerator
11:55 GuShh_Lap2 hah, it seems to only mater for the emissivity and not the air cooling
11:55 Shh_Lap2 bl
11:55 GargantuaSauce weird
11:56 GargantuaSauce youre probably overthinking this anyway
11:56 GargantuaSauce unless you absolutely need to optimize space/weight, just take a chunk of aluminium mill some slots stick a fan on there and call it a day
11:56 GuShh_Lap2 or grab an old pc heatsink
11:56 GargantuaSauce that too
11:57 GuShh_Lap2 It's one of those "what if" and "I must know" deals.
11:57 GargantuaSauce yeah i know that feeling
11:57 rue_more GuShh_Lap2, etching would rouch the surfacve and cause a slight increase
11:58 GuShh_Lap2 but from what I just read, it doesn't matter much when it comes to forced convection
11:59 rue_more prolly not no
11:59 GuShh_Lap2 I don't understand why, other than the "texture" may be too small to matter with this silly fluid we inhale all day long.
11:59 GargantuaSauce aluminium probably has too much thermal resistance for the surface texture to really matter anyway
11:59 GargantuaSauce if it were copper it would probably make much more of a difference
11:59 GuShh_Lap2 hey copper is too expensive for me
12:00 GargantuaSauce or silver, you guys have lots of that right? :D
12:00 Shh_Lap2 sh
12:00 Shh_Lap2 wonders if it's safe to assume someone is masturbating when they shower for over 5 minutes, either that or they're dead... but it's often the for
12:01 GuShh_Lap2 there must be a study on this!
12:01 GargantuaSauce i have been known to zone out for 20 minutes in the shower
12:01 GargantuaSauce good place to think!
12:01 GuShh_Lap2 is that what you call it
12:01 GuShh_Lap2 too noisy to think properly!
12:02 GuShh_Lap2 Close your eyes and imagine you are in a sinking ship... how is that a good place to think!
12:05 rue_more I need a state machine for entering a number one characters at a time
12:05 rue_more with delete and scape capability
12:06 GargantuaSauce lol have fun
12:07 rue_more I'm feeling better I can swollow again!
12:10 rue_more hmm, only need to take a max number of 30.00
12:10 rue_more 2 digits will do
12:10 GuShh_Lap2 watching some stills of "dumb and dumber to" jim carrey looks older but jeff daniels doesn't... it's nuts.
12:13 rue_more I watched 'the fly' last night
12:13 rue_more been a long time
12:13 GuShh_Lap2 haha I watched it in 1080p not long ago
12:13 GuShh_Lap2 maybe a month or two
12:15 GuShh_Lap2 I hope the new dumb and dumber movie is as good as the first one (ignore the second one, it was a big mistake)
12:15 GuShh_Lap2 :P
12:59 rue_more temp sensor in the truck is a 27k NTC then
13:04 rue_more er 2.7k
13:19 GuShh_Lap2 rue_more: when is the truck becoming electric?
13:19 GuShh_Lap2 darn I should go to sleep or something
13:19 GuShh_Lap2 but I got work to do...
13:19 rue_more I have to make other thigns electric first
13:19 GuShh_Lap2 thoughts
13:19 rue_more like the hand tracotr
13:20 rue_more see if the motors put out whats expected
13:20 rue_more then the lawn tractor
13:20 GuShh_Lap2 maybe junk food will give me a boost
13:20 rue_more if those work, I'll get the truck done
13:20 rue_more but I ahve a battery problem
13:20 rue_more samples not arriving
13:20 rue_more on one box I got from china, it looks like shipping li-ion is prohibited
13:20 rue_more big sticker
13:21 rue_more I guess they had fires
13:21 GuShh_Lap2 gotta machine 20 parts... well the absolute "must do asap" is 4.
13:21 SlaveToTheSauce rue_more: fedex will still do them but there's a capacity limit
13:21 rue_more fedex a package from china, hahahahaha
13:21 GuShh_Lap2 lol
13:21 rue_more it would cost less to build a factory here
13:22 GuShh_Lap2 YAWN
13:22 GuShh_Lap2 yawn yawn YAWN
13:22 GuShh_Lap2 tiny yawn and big yawn, are you yawning yet?
13:22 rue_more I'm home sick why aren't you working
13:22 rue_more the advil is wearing off
13:22 GuShh_Lap2 I'm too sleepy to be anywhere near power tools
13:23 GuShh_Lap2 what's wrong with your throat
13:23 rue_more the headache is comming back, and my throat is getting less operable
13:23 rue_more I got something
13:23 rue_more I think the sensor in the truck is actually a 2.78k NTC
13:23 GuShh_Lap2 you should make a robot to figure out what's wrong
13:23 GuShh_Lap2 a tiny robot!
13:24 Shh_Lap2 feels bad charging so much for these parts, but he has to get rid of his morals one
13:24 GuShh_Lap2 I realize now most of what you pay a machinist is for his time and skills, not the materials. Not calling myself one, just saying.
13:25 GuShh_Lap2 I might be a muchinist.
13:25 rue_more working on your lathe?
13:25 GuShh_Lap2 much complaint, much whining, much what-if
13:26 GuShh_Lap2 yeah got some parts commissioned. jokes on them.
13:55 rue_more we have an amazing auto parts store here
13:56 rue_more if they have it in stock, its what I need, if they would need to order it in, it turns out I didn't need it
13:56 rue_more due to a miscommunication they ordered my in a fuel injector,
13:56 rue_more the OTHER diagnosis is a temp sensor, which they DO have in stock
13:57 rue_more hmmm
13:57 rue_more I'm betting if I find a problem, its the temp sensor
14:08 GuShh_Lap2 what's the problem
14:08 GuShh_Lap2 rue_more
14:09 rue_more floodout on start when warmish
14:09 rue_more if I take it on a 5 min drive and shut it off, it'll flood when I try to restart it
14:10 rue_more quite a while ago the EGR was diagnosed as being bad and disconnected
14:10 rue_more I suspect thats actaully when the temp sensor started to go
14:10 rue_more and the egr pushed it over the edge
14:10 rue_more and now its worse
14:11 rue_more but I hear there are two temp sensors, so I'm trying to trace
14:11 rue_more the drawings I ahve show a 1 wire and 2 wire sensor, but their different drawings and may not even be for the same truck
15:38 GuShh_Lap2 rue_more: most cars have two
15:38 GuShh_Lap2 could be your refrigerant thermostat at fault too
15:39 GuShh_Lap2 it's just a valve with a spring but they go bad.
15:42 GuShh_Lap2 hrmm I'm still wired... I should finish some more parts
16:28 rue_more no AC
16:28 rue_more oh the tstat, its changed long ago
16:28 rue_more it was popped when I got the trcuk
16:28 rue_more which makes me wonder
16:35 GuShh_Lap2 rue_more: yes sorry coolant, I get them mixed up since it's refrigerant in spanish heh
16:36 GuShh_Lap2 "refrigerante" actually, refrigerant is the english equivalent
16:36 GuShh_Lap2 hmm got most parts done... except too which I rushed and need to remake
16:36 GuShh_Lap2 two*
16:36 Shh_Lap2 needs s
16:37 GuShh_Lap2 it's a press fit coupling in acetal and it has to be just down to the right diameter to work with an interference fit
16:37 GuShh_Lap2 small diameter acetal is rather bendy so that doesn't help
16:41 rue_more yup It should be in the order of 1k, its somewhere around 4M
16:41 rue_more I bet thats been a problem for a long time
16:41 rue_more why when I got it the tstat was tripped
16:42 rue_more why its always been heavy on gas
16:42 rue_more why the egr had to be disconnected
16:42 GuShh_Lap2 it was pretty much open loop
16:42 GuShh_Lap2 in diesel you'd call it limp mode :p
16:46 rue_more the timing pickup coil was shot too
16:46 rue_more from before
17:13 rue_more it looks like almost anything I install on this computer is gonna try to upgrade CUPS (something I dont want anyhow) and in the process remove acroread (this computer has the only properly working copy of acroread on it)
17:17 GuShh_Lap2 rue_more: tried using caustic soda to get a satin finish on aluminum? I can't get an even finish...
17:18 rue_more no
17:18 rue_more how about a tumbler?
17:18 GuShh_Lap2 I filed a chunk of scrap, degreased the portion, looked very clean, water wasn't beading up or anything... but the results are non uniform from the caustic soda
17:18 GuShh_Lap2 but in theory it should be even, and very fast
17:18 GuShh_Lap2 compared to a tumbler
17:18 GuShh_Lap2 a tumbler will also kill your edges
17:18 GuShh_Lap2 the caustic solution will take a lot longer to etch the surfaces
17:18 rue_more yup
17:19 rue_more BATTERY ACID!
17:19 GuShh_Lap2 but it will develop a satin finish rather quickly
17:19 rue_more it will enhance your edges
17:19 GuShh_Lap2 heh now you're talking almost anodizing
17:19 rue_more "ouch, my edges cut me"
17:19 GuShh_Lap2 the satin is almost instant, if only it were even throughout the piece...
17:19 GuShh_Lap2 maybe it needs longer, like an hour.
17:20 GuShh_Lap2 it's so nice to the touch though even after 2 minutes
17:20 GuShh_Lap2 of course, it's been rinsed...
17:20 GuShh_Lap2 that's the thing with anodizing though, it shows all your defects
17:21 GuShh_Lap2 pretty much highlights them
17:24 GuShh_Lap2 yeah it seems to require at least 20 minutes for a deep satin
17:34 rue_more baking soda?
17:34 GuShh_Lap2 huh
17:34 GuShh_Lap2 no, caustic soda.
17:34 GuShh_Lap2 drain cleaner.
17:34 rue_more ah
17:34 GuShh_Lap2 how would baking soda do anything to aluminum?
17:34 GuShh_Lap2 :p
17:34 GuShh_Lap2 "oh no it's puffing up!!! RUN"
17:35 rue_more my mind is half capable and Im half paying attention, thats like 1/4 result
17:35 GuShh_Lap2 I vaguely recall they use another chemical for satin finish
17:35 GuShh_Lap2 or that the "spent" solution is actually the good stuff, ie. after some aluminum has dissolved into it (possibly some conversion process takes place)
17:35 GuShh_Lap2 but they use caustic soda no doubt for at least one of the formulas
17:36 GuShh_Lap2 damn lye
17:37 rue_more is there a fucntion to get the value of the ascii characters... '0' ... to.... '9'... subtract 0x30
17:37 rue_more this is a lot of code for an avr
17:39 Shh_Lap2 puts rue_more to
17:40 rue_more http://paste.debian.net/87391/
17:40 rue_more my eyes are going crossed
17:40 rue_more its for entering up to dd.dd
17:41 rue_more in fixed place (*100)
17:43 SlaveToTheSauce GuShh_Lap2: aluminium will actually react with sodium bicarbonate the same way
17:43 SlaveToTheSauce just less enthusiastically
17:44 SlaveToTheSauce holy fuck you write disgusting code rue
17:44 GuShh_Lap2 SlaveToTheSauce: oh? is it the same reaction?
17:44 SlaveToTheSauce i think so
17:44 SlaveToTheSauce it's just a much weaker base after all
17:45 GuShh_Lap2 this almost looks like anodizing without a dye
17:45 GuShh_Lap2 or current...
17:45 GuShh_Lap2 but it can't be as strong surface, it doesn't have the same structure I bet
17:45 GuShh_Lap2 it feels soft
17:45 GuShh_Lap2 mind you a lot of smut builds up after a while
17:45 GuShh_Lap2 seems to stop the reaction
17:47 SlaveToTheSauce that would be aluminium hydroxide i'd assume
17:49 GuShh_Lap2 if I desmut and replace the part in the solution I get a deeper satin, it seems the smut is pretty much stopping the reaction.
17:50 GuShh_Lap2 this is all at room temp, I'm sure at a higher temperature I might get faster results, if not even "coarser"
17:50 SlaveToTheSauce you're getting bubbles right
17:50 SlaveToTheSauce that's hydrogen fyi
17:50 SlaveToTheSauce so higher temperatures might be something you don't want to try :V
17:53 GuShh_Lap2 yep hydrogen
17:53 GuShh_Lap2 but tiny amounts.
17:53 GuShh_Lap2 I've generated massive amounts of hydrogen when doing rust removal with electrolysis, never an issue if done properly
17:54 SlaveToTheSauce yeah just making sure. not a nice thing to have build upp
17:54 GuShh_Lap2 do it in a closed space, let it build up on the roof... your fault if your place goes tits up.
17:55 SlaveToTheSauce i have had inordinate amounts of fun igniting it in test tubes
17:55 SlaveToTheSauce makes the best noise
17:56 GuShh_Lap2 haha
17:56 GuShh_Lap2 I've only lit up the big bubbles in the tank
17:56 GuShh_Lap2 you can certainly collect it and use it if you wanted to...
17:57 GuShh_Lap2 surely not as dangerous as oxygen
17:57 GuShh_Lap2 specially with my greasy hands
17:57 SlaveToTheSauce i guess it's pretty fun to put in balloons
17:57 SlaveToTheSauce haven't tried that yet
17:58 GuShh_Lap2 big bang.
17:58 GuShh_Lap2 I was thinking along the lines of a tiny cutting or welding torch using hydrogen
17:58 GuShh_Lap2 but your terrorist balloons sound like fun.
17:58 SlaveToTheSauce oh yeah i want to build one of those sometime too
17:58 SlaveToTheSauce i assume you've seen the RHNB guy on youtube
17:59 GuShh_Lap2 not sure
17:59 SlaveToTheSauce http://www.youtube.com/channel/UCmxCoyvGU3IndS7bm9oH3Vg
17:59 GuShh_Lap2 I've watched one or two videos, I don't get it.
17:59 robotustra_ what could be max discharge current for this battery? http://www.ebay.com/itm/171242367258?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
18:00 SlaveToTheSauce yeah the actualy rhnb stuff is cool but ehhh
18:00 SlaveToTheSauce http://www.youtube.com/watch?v=U5yimCHi_h8 the torch is pretty sweet though
18:00 GuShh_Lap2 robotustra_: depends on it's ESR
18:00 GuShh_Lap2 well it's not equivalent it's real
18:00 SlaveToTheSauce i wouldn't try and pull more than 5-6A from one like that
18:00 GuShh_Lap2 fuck dammit why is dave in an ad
18:01 GuShh_Lap2 that stupid dipshit.
18:01 Shh_Lap2 twit
18:01 GuShh_Lap2 I didn't have to hear his whiny bitchy voice I DID NOT HAVE TO
18:01 GuShh_Lap2 I should sue YouTube for this.
18:01 SlaveToTheSauce hoooiiii
18:03 robotustra_ SlaveToTheSauce: if it give 5A I would be happy
18:03 GuShh_Lap2 robotustra_: is this for your russian cellphone?
18:03 GuShh_Lap2 signal is strong!
18:03 robotustra_ but there is a similar product from US and there is a max current is 2 A only
18:03 GuShh_Lap2 no temperature monitoring?
18:03 SlaveToTheSauce wouldn't surprise me if i've overestimated it
18:03 GuShh_Lap2 no charge / discharge manager?
18:04 SlaveToTheSauce also yeah judging by the connector, 2A makes more sense
18:04 GuShh_Lap2 those barrel connectors can handle a lot more than 2A, I would worry about the conductors :p
18:04 x3medima17 hello, I'm trying to control bipolar stepper with AVR and L298, but Enable 3 does not change state, I can't find the problem
18:04 robotustra_ that's why I'm thinking wheather to buy it and test myself
18:04 GuShh_Lap2 robotustra goes poof
18:05 GuShh_Lap2 Note: This listing is for battery only, camera is not included.
18:05 robotustra_ 5 A is not a big deal
18:05 GuShh_Lap2 haha
18:05 GuShh_Lap2 it wouldn't need to deal with more than 2A for a regular CCTV camera
18:05 GuShh_Lap2 usually under an amp per camera at night
18:05 robotustra_ ok
18:05 GuShh_Lap2 do you need peak 5A or sustained?
18:06 robotustra_ continuous
18:06 GuShh_Lap2 oh, time to take a look at the satin finish on this aluminum tube!
18:06 robotustra_ of pulses for 1-2 seconds
18:06 GuShh_Lap2 I knurled it for no good reason
18:07 robotustra_ I think may be 2 second pulses with 50% duty cycle
18:07 GuShh_Lap2 yes! it's all nice and even!
18:07 GuShh_Lap2 I need to figure out what can be added to the solution to prevent smut
18:08 GuShh_Lap2 finally I can satin finish aluminum without having to worry about media blasting
18:08 SlaveToTheSauce it looks like aluminium hydroxide is only soluble in acids
18:08 GuShh_Lap2 I remember reading about some additive to prevent the smut from sticking
18:08 GuShh_Lap2 ie. have it float or drop to the bottom
18:09 GuShh_Lap2 I just don't know what it was, but it probably wasn't a household chemical
18:10 Shh_Lap2 is looking it up and finding lots of dead
18:10 GuShh_Lap2 all I know is they call it alkaline etching
18:10 GuShh_Lap2 hmm http://www.google.com/patents/EP0565544B1?cl=en
18:11 GuShh_Lap2 "etch equalizing agent"
18:11 GuShh_Lap2 they friggin patented this???
18:11 SlaveToTheSauce higher temperature, higher concentration NaOH might do the trick
18:12 SlaveToTheSauce maybe light agitation for good measure
18:12 GuShh_Lap2 "(b) the etch solution also contains sodium nitrate, sodium nitrite, sodium sulphide, triethanolamine, sodium gluconate or sorbitol as an equalizing agent in an effective amount to promote a uniform rate of etching; and"
18:12 GuShh_Lap2 at least 70°C
18:12 GuShh_Lap2 1 minute!
18:12 GuShh_Lap2 wow.
18:12 SlaveToTheSauce might also be worth trying a solvent like alcohol or acetone
18:12 Shh_Lap2 bl
18:12 SlaveToTheSauce not sure how much of that gunk is aluminium hydroxide or sodium aluminate
18:12 SlaveToTheSauce chemistry is hard
18:12 GuShh_Lap2 you want me to make meth don't you.
18:13 GuShh_Lap2 I told you I am NOT Heisenberg.
18:13 SlaveToTheSauce well i mean do you not have a can of acetone kicking around?
18:13 GuShh_Lap2 a bottle, yes
18:13 GuShh_Lap2 99% at least
18:13 GuShh_Lap2 a liter bottle! they ask you "what is it for" when you purchase it at the store.
18:14 GuShh_Lap2 "TO CLEAN UP TONER" I reply.
18:14 GuShh_Lap2 - which is true -
18:14 SlaveToTheSauce so toss some in there and see what happens
18:14 robotustra_ good stuff http://www.ebay.com/itm/36V-37V-42V-10S-60A-Lithium-ion-Li-ion-Li-Po-LiPo-Polymer-Battery-BMS-PCB-System-/221214802862?pt=LH_DefaultDomain_0&hash=item33816e03ae
18:14 SlaveToTheSauce oh no don't do that
18:15 SlaveToTheSauce was not aware acetone will react with a strong base.
18:15 SlaveToTheSauce bad news.
18:16 GuShh_Lap2 SlaveToTheSauce: I'm not good at chemistry, but I know enough not to burn or blow myself up...
18:16 SlaveToTheSauce that looks sweet robotustra_
18:16 SlaveToTheSauce i want one
18:16 SlaveToTheSauce attn MrCurious you want one also
18:17 GuShh_Lap2 " What should be the maximum aluminum content in alkaline etching to avoid galvanized appearance (also known as spangling) in anodized (type II, natural, 10u) 6063 T6 extrusions"
18:17 rue_more irfb3206
18:17 GuShh_Lap2 the hell, that's a new word for me.. spangling
18:17 rue_more never heard of it
18:17 GuShh_Lap2 sounds gayish.
18:18 SlaveToTheSauce star spangled banner?
18:18 GuShh_Lap2 my gaydar just went off
18:18 robotustra_ I plan to buy this stuff + 2 batteries from mac book and make a pack like about 200 W
18:18 robotustra_ 12 cells
18:18 robotustra_ or 24 cells
18:18 GuShh_Lap2 why do you need so much power for your dildonics project?
18:19 robotustra_ I just calculated
18:19 rue_more http://www.irf.com/product-info/datasheets/data/irfb3206gpbf.pdf
18:19 rue_more dk dosn't have it
18:19 robotustra_ head will consume max 50W
18:19 Shh_Lap2 chuc
18:19 robotustra_ all body is about 150W
18:19 GuShh_Lap2 will it have muscles?
18:19 SlaveToTheSauce those are nice fets
18:19 robotustra_ yes
18:19 GuShh_Lap2 I think you are secretly making your new wife
18:19 SlaveToTheSauce pretty high gate capacitance though, as you'd expect
18:19 robotustra_ 150W is the power of all muscles
18:20 rue_more what you makin?
18:20 GuShh_Lap2 please have the power cord in it's ass.
18:20 SlaveToTheSauce you practically need a fancy mosfet driver for the mosfet driver
18:20 robotustra_ robot
18:20 rue_more you using pneumatic mulcles?
18:20 robotustra_ no cord
18:20 robotustra_ no
18:20 GuShh_Lap2 ok time to check on the satin finish!
18:20 GuShh_Lap2 how will it charge up without a cord?
18:20 GuShh_Lap2 solar? heh
18:20 robotustra_ no
18:20 Tom_itx inductance
18:20 robotustra_ no
18:20 GuShh_Lap2 lies
18:20 rue_more GuShh_Lap2, you know, water + electricity would do it
18:21 SlaveToTheSauce onboard fusion reactor
18:21 m_itx puts a fingerprint in GuShh_Lap2's p
18:21 GuShh_Lap2 you say?
18:21 GuShh_Lap2 Tom_itx: it's not paint! I'm trying to satin finish aluminum!
18:21 GuShh_Lap2 if anything you'll get a soapy finger
18:21 robotustra_ it will be kind of hidraulic
18:21 robotustra_ I mean muscles
18:21 SlaveToTheSauce escher water wheel? i like it
18:21 rue_more I really doubt a to-220 can take continious 120A across the pins
18:22 SlaveToTheSauce look at the rdson rue
18:22 rue_more I'm talking about the pins
18:22 SlaveToTheSauce the pins are included in that figure
18:22 rue_more the PINS on the to-220, I bet they cant take 120A for more than a few ms
18:23 Tom_itx long enough to be called a fuse
18:23 rue_more they say its the bind wires that are the limit
18:23 SlaveToTheSauce ya usually is
18:24 SlaveToTheSauce (if not the channel)
18:24 rue_more if I can convert myself to a machine I dont think I'l miss getting ill
18:24 robotustra_ ok, should make a test
18:24 SlaveToTheSauce you'll just have a new kind of virus to shake off
18:25 GuShh_Lap2 awesomeeeee
18:25 GuShh_Lap2 this thing looks great!
18:25 SlaveToTheSauce pics
18:25 rue_more "came down with a case of bloatware"
18:25 GuShh_Lap2 love the way it looks
18:26 Tom_itx 3M pad
18:26 Tom_itx will do that
18:26 Tom_itx or 600 wet/dry paper
18:26 GuShh_Lap2 no, no way
18:26 GuShh_Lap2 this looks white almost
18:26 GuShh_Lap2 and soft
18:27 Tom_itx how then?
18:27 rue_more damn i can pull escape out of here all togethor
18:27 SlaveToTheSauce does it scratch super easily?
18:27 GuShh_Lap2 using caustic soda
18:27 GuShh_Lap2 haven't tried
18:28 GuShh_Lap2 it's just a scrap piece for testing purposes, but I like the way it looks so far.
18:29 GuShh_Lap2 I'll get a pic
18:29 Tom_itx different alloys will produce different results
18:29 rue_more GuShh_Lap2, take another scrap, try salt water and 12V
18:30 rue_more bet it'll finish in a few mins
18:30 GuShh_Lap2 this did finish in a few mins
18:30 GuShh_Lap2 Tom_itx: most likely 6063 or 6061
18:31 robotustra_ orgasm http://www.ebay.com/itm/36V-8-7Ah-500W-EV-E-Bike-E-Scooter-Lithium-Ion-Lion-Battery-Built-in-60A-BMS-PCM-/321188990098?pt=US_Rechargeable_Batteries&hash=item4ac85b0c92
18:31 GuShh_Lap2 the shiny part is 600 wet sand paper http://gushh.net/tmp/dscn5223f.jpg
18:32 GuShh_Lap2 it never had a nice surface, since it was a scrap piece
18:32 GuShh_Lap2 looks better in person!
18:33 Tom_itx so do i
18:33 GuShh_Lap2 you say that.
18:33 GuShh_Lap2 this finish reminds me of cheap "aluminum paint"
18:36 GuShh_Lap2 SlaveToTheSauce: http://gushh.net/tmp/dscn5218f.jpg how do you want me to try the scratch resistance? swirl it around in my pocket with the keys? heh
18:37 rue_more I need code ot do digit replacment in a number
18:37 rue_more if I have 58.23 and want to replace the 1's digit with a 7 for example
18:37 rue_more where the number is stored at 5823
18:37 GuShh_Lap2 dings up as easily as the raw surface
18:38 rue_more not as a string
18:38 rue_more GuShh_Lap2, and good luck washing out your fingerprint oil
18:38 GuShh_Lap2 rue_more: huh?
18:38 GuShh_Lap2 it was degreased before the bath
18:38 GuShh_Lap2 now it's covered with oily residues
18:39 rue_more if I bend a loop too small to fit a rod thru, i can drill it and fit in the rod
18:39 GuShh_Lap2 for a lathe handle or something like that this looks promising
18:39 GuShh_Lap2 the process that is
18:39 rue_more they just use that finish to hide things
18:39 rue_more real stuff is chrome plated
18:39 Shh_Lap2 s
18:40 rue_more you can hide anything under chrome
18:40 Tom_itx rue_house unless it breaks
18:40 Tom_itx google chrome?
18:40 GuShh_Lap2 chromed aluminum???
18:40 rue_more hell ya
18:40 rue_more remember to copper plate it first!
18:40 GuShh_Lap2 why the hell would you do that
18:40 GuShh_Lap2 start with a better material instead
18:40 GuShh_Lap2 instead of polishing a turd.
18:41 GuShh_Lap2 and I don't see how this hides anything, I can see all the dings it had before!
18:41 GuShh_Lap2 and all of the machining marks
18:41 rue_more it hides machining marks
18:41 GuShh_Lap2 it's just nicer to the touch
18:41 GuShh_Lap2 it doesn't I can see them!
18:41 Tom_itx the knurl was set uneven
18:41 GuShh_Lap2 just because the highlights are less prominent doesn't mean they're not there
18:42 rue_more I want to make a pinch knurler
18:42 GuShh_Lap2 Tom_itx: it was knurled in two steps
18:42 rue_more and get some straight knurling wheels
18:42 GuShh_Lap2 did I not say it was a scrap piece :(
18:42 Tom_itx the last pass is still deeper
18:42 rue_more oooh there it is
18:42 GuShh_Lap2 oh it's deeper by the bottom because it was flexing near the middle
18:43 GuShh_Lap2 but the diamonds are not too offset
18:43 rue_more you need a pinch knurler
18:43 Tom_itx it's deeper all the way across
18:43 Tom_itx that's how we did threads
18:43 Tom_itx double roller geared together
18:43 GuShh_Lap2 it gets softer as it gets to the non satin side, because it's a long thin tube and it was bending from the knurler force (side force)
18:44 rue_more http://www.projectsinmetal.com/wp-content/uploads/2009/04/knurling-tool-2.jpg
18:44 GuShh_Lap2 the OD is bigger at the bottom
18:44 GuShh_Lap2 that's where the center was
18:44 rue_more http://www.projectsinmetal.com/free-metalworking-project-plans-a-knurling-tool/
18:44 GuShh_Lap2 rue_more: I plan to make one of those
18:44 GuShh_Lap2 refuse to buy it.
18:44 rue_more me too!
18:45 rue_more I thought of it looking at a knurled jewlers screwdriver
18:45 Shh_Lap2 won't get OCD-triggered by Tom_itx t
18:46 GuShh_Lap2 it was a test - it was a test - it was a test
18:46 GuShh_Lap2 at least I got it tracking, you should see my first attempt
19:03 GargantuaSauce cool GuShh_Lap2
19:03 Tom_itx :)
19:04 Tom_itx did you see my first attempt at cross threading a rod?
19:05 robotustra_ bought battery and watt meter
19:05 robotustra_ will do tests
19:05 GargantuaSauce what are you gonna use as a load?
19:05 robotustra_ robot head
19:05 Tom_itx http://tom-itx.dyndns.org:81/~webpage/reprap/drive2.jpg
19:05 GargantuaSauce for the testing too?
19:05 robotustra_ yes
19:06 robotustra_ current consumption
19:06 robotustra_ now there are not so much stuff
19:06 GargantuaSauce that's for extrusion i assume Tom_itx?
19:07 robotustra_ it's for printer?
19:07 robotustra_ ah yes reprap
19:08 robotustra_ I still don't like 3d printers
19:08 robotustra_ molding from carbon fiber is better
19:08 robotustra_ and nicer
19:09 Tom_itx GargantuaSauce yes
19:09 robotustra_ stronger and lighter
19:09 Tom_itx i never finished it though
19:09 rue_more https://www.youtube.com/watch?v=0ca9rxQkEiA
19:09 rue_more hahaha
19:09 Tom_itx it was more an exercise to see if i could make one
19:10 Tom_itx afterward i made one from SS: http://tom-itx.dyndns.org:81/~webpage/reprap/drive4.jpg
19:11 GargantuaSauce shiny
19:11 Tom_itx not bad for a first attempt
19:11 robotustra_ I can't find application to 3d printer
19:11 Tom_itx feed roller
19:12 robotustra_ I was thinking to make one but I can't find any application for thar
19:12 robotustra_ that
19:12 Tom_itx oh
19:12 Tom_itx me either really
19:12 GargantuaSauce if you have all the stuff to work aluminium there isn't a huge point
19:12 robotustra_ yes
19:13 GargantuaSauce it's certainly more suited to the living room than a mill though
19:13 robotustra_ I can mill parts and they will be stronger and nicer
19:13 robotustra_ my mill is in the living rood btw
19:13 robotustra_ room
19:13 GargantuaSauce well lucky you
19:14 GargantuaSauce if i throw designs at you will you make me some hypocycloidal reducers? :)
19:14 Tom_itx for what?
19:14 GargantuaSauce a few different things
19:14 robotustra_ hypocycloidal?
19:14 GargantuaSauce serial arm is the most obvious application
19:14 GargantuaSauce http://www.zincland.com/hypocycloid/ these
19:15 robotustra_ it's like harmonic drive&
19:15 robotustra_ ?
19:16 GargantuaSauce similar yes, but less ridiculously expensive
19:16 robotustra_ oh nice
19:16 robotustra_ I can mill it if you want
19:17 robotustra_ if you'll make drwings
19:17 GargantuaSauce sweet, i will probably have designs for you in a couple weeks
19:18 robotustra_ ok
19:19 Tom_itx kinda like a wankel engine works
19:19 robotustra_ no
19:20 GargantuaSauce soort of
19:22 robotustra_ it's a cycloid inside ring
19:22 GargantuaSauce a wankel engine could be viewed as a 3-toothed version
19:32 MrCurious when did this place start discussing their rankel's
19:33 MrCurious wankels
19:34 GargantuaSauce http://www.osengines.com/engines-airplane/osmg1401/ look at this little wankel!
19:35 MrCurious you are showing me pics of your wankel?
19:36 MrCurious is this the mazda rotary design
19:37 GargantuaSauce no it's for if you want a flying wankel
19:37 MrCurious i see.... no i totally dont see... bt i think its ok that i dontsee
19:39 MrCurious if we are going to discuss wankel's further, shouldnt we have a safe-word, like banana?
19:43 MrCurious so that pole dancing robot from yesterday... just realized that was the ABSOLUTE LAST career that i expected to be made redundant by robots.
19:52 GargantuaSauce http://ubislate.us/product.php?prodid=1
19:52 GargantuaSauce man i should get like 4 of these
19:55 GargantuaSauce aw no bluetooth
19:55 GargantuaSauce oh it has usb host though, that's plenty
19:55 robotustra_ should make some peristaltic pomps on the base of hypocycloid reductor
19:55 GargantuaSauce perfect onboard user interface
19:55 GargantuaSauce ooh that'd be cool
19:56 GargantuaSauce giving your tin man a heart <3
19:56 robotustra_ no
19:56 rue_more wow, those are getting cheap
19:56 rue_more mine was only $76
19:56 robotustra_ it will have 4 hearts
19:56 rue_more I think by price andoirds are gonna take over the marker
19:56 robotustra_ and all of them will be pulsed
19:57 GargantuaSauce they already have byfar rue_more
19:57 robotustra_ peristaltic pomps are needed for fuel
19:57 robotustra_ and muscles
19:58 robotustra_ "service liquids"
19:58 GargantuaSauce i don't think that type works well as a hydraulic power source
19:58 GargantuaSauce might need a gear pump for that
19:58 robotustra_ I need not big pressure
19:58 GargantuaSauce are you going to use ridiculously big cylinders?
19:58 robotustra_ just to pump fuel from one tank to another
19:59 robotustra_ no, it will be small, 2 " in diameter
20:00 robotustra_ and 2 cm height
20:00 robotustra_ without a motor
20:01 robotustra_ may be I make one from polycarbonate
20:02 Tom_itx GargantuaSauce how much slop is in the recuder?
20:02 Tom_itx similar to a harmonic drive?
20:02 GargantuaSauce yeah i think so
20:02 GargantuaSauce low backlash is one of the design advantages touted by every source i've seen
20:02 Tom_itx why are they not more in use than harmonic drives then?
20:02 GargantuaSauce i have no idea
20:03 Tom_itx steel would be best to make them right?
20:03 robotustra_ not necessary
20:04 robotustra_ it's not big friction there
20:04 GargantuaSauce better wear characteristics on harmonic drives perhaps?
20:04 robotustra_ put some grease and everything will be fine
20:04 Tom_itx i don't know
20:07 Tom_itx does it run reverse of the motor?
20:07 GargantuaSauce another thing of note is torque cannot be transmitted from the output to the iput
20:07 Tom_itx probably not suited for a rotary axis?
20:08 GargantuaSauce they're definitely used on serial arms
20:08 robotustra_ need latex pipe 4 mm diameter
20:10 rue_more latex!?
20:11 GargantuaSauce surgical tube is the best bet i guess
20:11 GargantuaSauce http://www.ebay.ca/itm/221281054048
20:13 GargantuaSauce http://www.youtube.com/watch?v=ZHv6VkKBPGA sweet
20:14 rue_house surgical tube does NOT work for airmuscles
20:15 GargantuaSauce heheh i wouldn't think so
20:15 GargantuaSauce well there's super wide stuff that would probably work AS air muscle
20:16 robotustra_ http://www.ebay.com/itm/Silicone-Tubing-Food-Grade-Translucent-Rubber-Tube-Hose-Pipe-Beer-Water-Air-Pump-/321121883352?pt=LH_DefaultDomain_0&var=&hash=item4ac45b14d8
20:16 rue_house no, it stops when it hits the loom
20:16 rue_house the grain is wrong or something
20:18 GargantuaSauce hmm
20:18 GargantuaSauce anyway yeah that link is much better
20:18 GargantuaSauce since there's 8mmOD 4mmID stuff
20:18 GargantuaSauce niiice and thick
20:19 rue_house what a flameproof do tho
20:20 Tom_itx http://www.youtube.com/watch?v=VrvwlPxRhKU&list=UUexvgsGz_QFvOublovDYoTQ&feature=share&index=4
20:27 robotustra_ I will not do hydraulic or pneumatic muscles
20:27 robotustra_ because pomps take too much space
20:28 robotustra_ muscles will be electric
21:18 rue_house electric muscles are usually heat based, and their expansion times are tied to their cooling times
21:19 GargantuaSauce pretty sure he means motors
22:03 robet anyone know what those high torque motors are called, used in robotic joints -- they resemble a circular cap with a bunch of bolts securing the face of them.
22:04 Tom_itx harmonic drives
22:05 GargantuaSauce yeah they are usually stepper motors with harmonic drives on top
22:05 robet thx i will search for that. you can kind of see them here on the image to the left http://www.robotspodcast.com/podcast/uploaded_images/Robots-ReemB-HUBO-humanoids.jpg
22:05 GargantuaSauce or potentially cycloidal reducers
22:05 rue_more or planetary gears
22:06 GargantuaSauce maybe, those need lots of stages to have similar ratios though so they're quite long
22:06 GargantuaSauce so it's usually very obvious when they are used
22:07 rue_more I wish C could nativly return multiple variables
22:07 GargantuaSauce just pass pointers as parameters
22:07 rue_more (int a, char c) MyFunction (char a, char b);
22:07 rue_more yea, but still,
22:08 GargantuaSauce or make it return an anonymous struct
22:08 GargantuaSauce i think you can do that, not sure
22:08 rue_more its on an avr, I'm better off using global variables
22:08 robet typedef struct { int a; char c } intchar_t;
22:10 rue_more I got my 20 10k pots from ebay, now I can make 20 more servos
22:12 robet the cycloidal drive is very interesting. is the harmonic drive a simpler interpretation of it? and also does it provide a high torque ratio only at certain points, in other words it has a stall point if there isn't quite enough momentum
22:13 GargantuaSauce i believe they both have pretty constant ratios
22:13 rue_more the harmonic drive uses a distorted cup with teeth
22:13 rue_more I think the cycloidal is longer life
22:14 GargantuaSauce also tell us about your application
22:14 rue_more damn I wonder if I should have a 3rd advil today
22:28 Tom_itx if it kicks it, sure
23:56 Curious mumbles and looks ar
23:58 rgantuaSauce beers MrCurious a
23:58 MrCurious emmm that is an excellent idea....