#robotics Logs

Mar 09 2014

00:05 rue_more hmmm
00:37 MrCurious took fingerprint scanner from a laptop and it appears to not be a usb device :(
00:39 GargantuaSauce wtf is it then
00:39 MrCurious after step 2something with about 12 wires
00:41 GargantuaSauce weird.
00:41 GargantuaSauce gave up on getting the bootloader working. finally figured out how to convince the ide to flash using the programmer
00:41 GargantuaSauce wait no i didn't, that didn't work
00:42 GargantuaSauce finally figured out how to tell it to not delete everything it builds immediately, ran avrdude manually
00:49 GargantuaSauce so they flipped one of the directions in the firmware between revisions
00:49 GargantuaSauce sooooo homing one of my axes slammed it into the opposite end! yay
00:49 GargantuaSauce i hate all this ad hoc shit
01:14 GargantuaSauce 4 am happened very quickly tonight
01:49 rue_shop3 :) I added a footrest to the chair-of-doom
01:49 rue_shop3 but now I need motor control for chair swing
04:10 rue_shop3 sweeet
04:10 rue_shop3 via kermit, I have the avr sending me a colour serial menu
04:10 rue_shop3 Bench power 1.0
04:10 rue_shop3
04:10 rue_shop3 Channel 1: 0.00v/0.00v 0.00A/5.00A 0.00w/150w
04:10 rue_shop3 Channel 2: 0.00v/0.00v 0.00A/5.00A 0.00w/150w
04:10 rue_shop3 ? for Help
04:10 rue_shop3 >
04:10 rue_shop3 but with colour!
04:27 rue_shop3 http://eds.dyndns.org/~ircjunk/projects/newpower/Interface.png
04:27 R0b0t1 oh hey that's pretty neat
04:28 rue_shop3 its via kermit right off the serial port, comming from an AVR
04:28 R0b0t1 might want to set your usergroups right so you don't need to access devices as root :>
04:28 GargantuaSauce cool, hope it turns red when you hit the current limit
04:28 rue_shop3 heh
04:28 rue_shop3 I was thinking that
04:28 rue_shop3 maybe I could use the colours to say if its in voltage or current mode
04:28 GargantuaSauce also V and W are capitals, just quibbling at this point though
04:28 rue_shop3 for what it matters
04:29 rue_shop3 I changed that a few times
04:29 rue_shop3 neither look right
04:29 rue_shop3 esp w vs W
04:29 GargantuaSauce i blame your choice of font
04:29 rue_shop3 heh
04:29 rue_shop3 its cool, cause the supply itself has the analog on the front
04:29 rue_shop3 and then you can plug in usb and use a serial interface to see all the digital stuff
04:30 rue_shop3 no software req'd
04:31 rue_shop3 and kermit has all sorts of ansi quirks
04:39 rue_shop3 I have to work out how to do the acutal meat of this now
04:40 rue_shop3 hah but its 1:30 and I'm starting to nod off
04:42 rue_shop3 our number system is a bit stupid
04:42 rue_shop3 the first character you recieve is the 1's place, ok
04:42 rue_shop3 then the tens, ok
04:43 rue_shop3 ...
04:43 rue_shop3 then you get a dot. suddenly its all out the window
04:43 rue_shop3 your recieving 1/10ths
04:43 rue_shop3 what kinda order is that?
04:44 rue_shop3 I suppose it would be hard to know what place your recieving if it were in order
04:45 rue_shop3 hmm, I suppose my format has to be 00.00 for volts, can be 0.00 for amps, and needs to be 000.00 for watts
04:45 rue_shop3 as its 30V, 5A
04:56 rue_shop3
09:13 GuShH_ where's tom-itx?
12:27 rue_house yea...
12:27 rue_house "<tom_itx> ...bye"
12:47 GuShH_ rue_house: so where is he? heh
12:47 GuShH_ I need his advice.
12:58 MrCurious you, my friend, need a magic 8-ball
13:06 rue_more GuShH_, his email will be on his site, see if he will reply
13:21 GuShH_ rue_more: hm a 3 phase motor with 0.25kW on it's plate, is it half a horse? 380/220
13:22 GuShH_ I can't tell the amps from the plate
13:23 GuShH_ I think it says 0.81 / 1.4A must be 1.4 full load?
13:23 MrCurious or max draw at max speed unloaded
13:23 GuShH_ perhaps
13:24 MrCurious stall current would be more insightfun no?
13:24 GuShH_ it's 3 phase they're single speed
13:24 GuShH_ no vfd involved
13:24 GuShH_ if only the picture wasn't out of focus.
13:24 MrCurious i disdain 3 phase motors
13:24 GuShH_ IF ONLY PEOPLE KNEW HOW TO TAKE PICTURES
13:24 GuShH_ to me they're 1HP given their size and specs, but could be half hp...
13:25 MrCurious gush... want to fabricate one of these? http://www.zincland.com/hypocycloid/
13:27 GuShH_ time to use "computer magic"
13:28 GuShH_ MrCurious: that's your own obsession not mine
13:29 GuShH_ I can just about machine the offset cam/shaft
13:29 MrCurious yeah that llittle bit is driving my foolish need for a lathe
13:30 GuShH_ a cnc mill will do it
13:30 GuShH_ including the other parts
13:30 GuShH_ otherwise ask a friend to machine it for you
13:31 GuShH_ mild steel will do but given the nature of it, I bet aluminum will work just as well.
13:31 GuShH_ 1380RPM
13:31 GuShH_ yey one more number out of the plate
13:32 GuShH_ perhaps you can see better? http://mla-s1-p.mlstatic.com/motor-12-hp-trif-4133-MLA2771600486_062012-F.jpg
13:32 GuShH_ this guy still has 20 of them for dirt cheap
13:32 GuShH_ classic cellphone picture, all moved up.
13:33 GuShH_ I think it says 0.81 / 1.4A
13:33 GuShH_ these used to be good motors, compared to the china crap they sell now adays
13:36 MrCurious 50hz
13:36 MrCurious 0.89/13 A
13:38 MrCurious i mean 0.89/14 A
13:38 GuShH_ no way
13:38 GuShH_ 1.4A
13:38 MrCurious no... 0.87/14 A
13:38 MrCurious decimal is too faint
13:38 GuShH_ 0.81
13:38 MrCurious compared to the decimal in 0.87
13:39 GuShH_ I'm using an emboss filter to recover some of it
13:39 MrCurious i zoomed on my screen
13:39 GuShH_ I believe it says 1.4
13:39 GuShH_ I guess it's half hp, but I don't know.
13:41 GuShH_ well it must be 1.4A full load that makes it a 1/2HP if it's 3 phase
13:41 GuShH_ - I THINK -
13:43 GuShH_ because 1.3 is the 1/2HP motor amperage on 380/415VAC given a table I'm looking at
13:43 GuShH_ they look rather big for half hp, I thought they would be 1hp... in 3 phase 1hp motors look like that
13:45 GuShH_ bah not all of them have the same RPM... so they're different, poo.
13:45 GuShH_ the 2800rpm one says 0.93 / 1.50 A
17:38 Triffid_Hunter GargantuaSauce: no, designed it before I had a 3d printer, then never got around to printing it
17:38 Triffid_Hunter esp as it turned out that the reduction would have been way too high for an extruder even if it did work as intended
18:34 GargantuaSauce Triffid_Hunter: yeah i don't think it's feasibly printed
18:34 GargantuaSauce unless it was quite big and had low power density
18:35 Triffid_Hunter GargantuaSauce: actually I think it would turn out ok if printed from PLA and with appropriate adjustment for required clearances
18:35 GargantuaSauce maybe with relatively low reduction yeah
18:35 GargantuaSauce http://lcamtuf.coredump.cx/gcnc/ch4/
18:35 GargantuaSauce this guy machines molds and casts resin
18:36 Triffid_Hunter GargantuaSauce: low reduction is tricky with hypocycloids
18:36 Triffid_Hunter use planetary if you want lower
18:36 GargantuaSauce i just mean so the tooth pressure is lower, PLA isn't alll that strong after all
18:37 GargantuaSauce maybe it's worth trying i dunno
18:37 Triffid_Hunter GargantuaSauce: oh? news to me.. the PLA stuff I print is astonishingly strong
18:37 GargantuaSauce even the finer structures like teeth?
18:37 Triffid_Hunter as in, throw at concrete as hard as I can then jump on it, and it barely gets a mark
18:38 GargantuaSauce well perhaps you should give it a shot! and i'll keep wrestling with my shitty mendel until it gets to a point where i can
18:38 Triffid_Hunter GargantuaSauce: yes, especially with things like teeth, it's better than ABS because it's harder
18:38 Triffid_Hunter just gotta beware the 60°C temperature ceiling at which it goes soft
20:13 rue_more TELunus, https://www.youtube.com/watch?v=Ye8NtIZkixI
20:13 rue_more you seen the latest form of harmonic drives?
20:15 TELunus So... That's just some POS poorly stuck on a drill chuck right?
20:15 Jak_o_Shadows I have heard of those
20:16 TELunus In the video I mean.
20:16 Jak_o_Shadows Yep
20:18 TELunus Cause I noticed that it spin's freely when he moves his hand.
20:21 TELunus Oh, now I feel dumb. The outside stops it from moving, so when he's not holding then it can spin. But when he's holding the outside the middle layer (with the cap screws) is linked to the center.
20:23 GargantuaSauce http://www.zincland.com/hypocycloid/ there's an exploded view here
20:28 TELunus Thanks. The video also links there.
20:55 rue_shop3 its a good solution to the stress problems for a standard harmonic drive
20:56 rue_shop3 TELunus|2, do you remember what kinda power you worked out is suitable for a vehicle?
20:56 TELunus|2 Nope.
20:56 rue_shop3 oh
20:58 TELunus|2 But it's acceleration*velocity*mass
21:04 GuShH_ darn I love knurling
21:06 rue_shop3 GuShH_, you have a punch knurler or a squish one?
21:11 rue_shop3 I need to stand back and examine my goals
21:11 rue_shop3 1) immortality
21:11 rue_shop3 2) take over the world
21:12 rue_shop3 3) get more stuff
21:12 rue_shop3 hmm
21:12 rue_shop3 hmmmm
21:12 GargantuaSauce sounds like we're in good alignment
21:12 rue_shop3 ok
21:12 GargantuaSauce as long as 4) leave this rock, is included
21:12 rue_shop3 so anything that supports the immortality thing is something I should be working on
21:12 rue_shop3 good point
21:13 rue_shop3 I dont mind being here, I dont like being trapped here
21:13 rue_shop3 so
21:13 rue_shop3 I need to make a hand thats capable of building a robot
21:14 rue_shop3 and not being burned when people hand me really hot peices of metal they have just been welding
21:14 e_shop3 stares at TELunu
21:14 rue_shop3 dont need all these extra fingers tho
21:15 rue_shop3 more arms would be good tho
21:15 rue_shop3 TELunus|2, and hand designes you like/
21:15 rue_shop3 ?
21:16 TELunus|2 Hmm, none I can think of that can withstand recently welded metal.
21:16 rue_shop3 mechanism wise
21:16 GargantuaSauce http://www.youtube.com/watch?v=-KxjVlaLBmk this one is pretty cool
21:16 rue_shop3 I think I like cable drives
21:17 GargantuaSauce i wonder where they went with it in 5 years
21:17 rue_shop3 I like the "intel hand" better
21:17 rue_shop3 GargantuaSauce, they prolly graduated from school and forgot about it
21:18 rue_shop3 hmm linkages
21:18 rue_shop3 who made that cool wooden hand
21:18 rue_shop3 WAS THAT YOU!?
21:19 rue_shop3 oo I have 1/8 wire now
21:19 rue_shop3 somewhere I have a drafting of my hand
21:21 rue_shop3 oh I only did one finger, and it came out odd
21:22 rue_shop3 its right, but it looks odd
21:25 rue_shop3 TELunus|2, did you know that the human finger has two gripping tendons and one for retraction?
21:25 rue_shop3 its only 3 total
21:25 TELunus|2 I did not.
21:26 rue_shop3 thats why gripping is so much stronger than ungripping
21:26 rue_shop3 and more controlled
22:16 GuShH_ rue_shop3: have you seen RifRaf lately'
22:17 GuShH_ ?
22:17 GargantuaSauce [07:46:58] <kthx> RifRaf was last seen in #reprap 2 weeks 5 days ago
22:17 GuShH_ darn
22:17 GargantuaSauce on vacation or dead
22:17 GuShH_ where is the guy!
22:17 GuShH_ that's not a nice thought
22:18 GuShH_ I know he had some bad news
22:18 GuShH_ but not enough for such depression, I hope.
22:18 ShH_ really hopes he'
22:18 GuShH_ I think GargantuaSauce is just saying that to score his lathe.
22:19 GuShH_ "The guy's dead, he don't need it no moar"
22:19 GargantuaSauce shipping one from down under would probably cost more than buying a fullsize one new here
22:19 GuShH_ lol
22:19 GuShH_ He pretty much left it outside for months, it's all covered in surface rust
22:20 GuShH_ But so are most used lathes and mills I've seen.
22:20 GuShH_ It's a reality, quite often the owners die and the machines are left to rot.
22:20 GuShH_ But to some, that's one opportunity to score cheapish machines, in some countries.
22:21 GuShH_ Sad truth.
22:21 GuShH_ Life and all.
22:21 GargantuaSauce i decided against buying that mini lathe, i realllly don't have a space for using it
22:21 GuShH_ It's about 2 laptops long I think
22:21 GargantuaSauce hardwoord floors and swarf are a pretty bad combination
22:21 GuShH_ rubber mat
22:22 GargantuaSauce i need access to a mill too anyway really
22:22 GuShH_ Depends also on the material, brass turns mostly into dust.
22:22 GuShH_ mills are even messier
22:22 GargantuaSauce yeah
22:22 GuShH_ fling fling fling swish fling fling
22:23 GuShH_ try a fly cutter next to your hardwood floor!
22:23 GuShH_ I think one of the cleanest machines are shapers.
22:23 GuShH_ not too useful these days though
22:24 GuShH_ rather slow...
22:24 GuShH_ aside from keyways and other similar operations, I don't see why you'd want one of those
22:26 GuShH_ ohh I see, dovetails and gears... I guess, with accessories. You'd need some for a mill anyway, if you wanted to cut gears
22:26 GuShH_ one way or another to index the work.
22:27 GargantuaSauce http://modelengines.info/ apparently i have an indirect personal connection to this guy, might try and cultivate that
22:27 GuShH_ GargantuaSauce: if you limit yourself to plastics, swarf is not a problem anymore since it's soft.
22:27 GuShH_ oh?
22:27 GuShH_ holy shit that's an awesome model engine
22:28 GargantuaSauce yeah. all from scratch
22:28 GuShH_ the amount of work involved in that thing is nuts.
22:28 GuShH_ castings...
22:28 rue_shop3 cool lathe
22:28 GuShH_ that's dedication.
22:28 GuShH_ rue_shop3: sorry, what lathe?
22:28 GuShH_ ohh the tiny one
22:29 rue_shop3 hey a guy pointed out that he dosn't use the tailstock for drilling, he made a post chuck, the idea is, its centered better and faster
22:29 GuShH_ a post what.
22:29 GuShH_ sorry it's lathe I mean late and I should be asleep.
22:30 GuShH_ I use the tailstock a lot.
22:30 GuShH_ anything between centers requires it..
22:30 rue_shop3 drilling, he made a drill bit holder for the toolpost
22:30 GuShH_ specially for center drilling
22:30 rue_shop3 you can peck faster with it
22:31 GuShH_ oh a cam operated one?
22:31 rue_shop3 and you can get the alignment better
22:31 GuShH_ like on a turret lathe...
22:31 GuShH_ I might get a turret lathe, undecided.
22:31 GuShH_ certainly allows for quick work.
22:31 rue_shop3 even just a drillbit holder on the toolpost
22:31 GuShH_ meh
22:31 rue_shop3 I'm gonna keep my eyes out for a 3/8 chuck to make one
22:31 rue_shop3 seeing as my tialstock is like 15 thou high
22:32 GuShH_ really?
22:32 GuShH_ scrape it
22:33 GuShH_ there might just be a few contact areas that are high
22:33 GuShH_ wipe the ways clean, dye, slide, watch!
22:33 GuShH_ then scrape the high spots.
22:34 GuShH_ I somehow doubt it matters, do you do a lot of precision work, and is a center drill not enough to... center your bits?
22:34 rue_shop3 no, shim up the headstock
22:34 GuShH_ that's not going to work very well
22:34 rue_shop3 but youhave an intersing point
22:34 e_shop3 gets a sha
22:35 GuShH_ hrmm no prussian blue? NO SMURF JUICE?
22:38 GuShH_ http://modelengines.info/naphtha/Main/
22:38 GuShH_ that's a skill I need to work on
22:40 GuShH_ but silver brazing is not particularly cheap compared to other methods
22:40 rue_shop3 odd
22:40 rue_shop3 it dosn't hit much of the reference rail
22:40 rue_shop3 sorta two slips down the middle of it
22:41 GuShH_ yeah
22:41 GuShH_ mine doesn't contact all of it either
22:42 GuShH_ see why dyes are useful!
22:42 rue_shop3 sharpie
22:42 GuShH_ it's got a dye
22:42 GuShH_ I use sharpie on small parts
22:42 GuShH_ but otherwise I use layout blue
22:42 GuShH_ also to mark a parting line, sharpie then I touch it with the calipers
22:42 rue_shop3 dollar store, sharpie + alcohol
22:42 GuShH_ layout blue is cheap, you only use a tiny amount every time
22:42 GuShH_ lasts forever
22:42 GuShH_ like locktite
22:43 GuShH_ mine is slow dry... gets messy sometimes
22:45 GuShH_ this guy's attention to detail is amazing
22:45 rue_shop3 well, this weekend I proved that I can use kermit and ANSI terminal codes to get an avr to provide an interface over a serial link
22:45 rue_shop3 he's really good at building the stuff
22:45 rue_shop3 $$$ tho
22:45 GuShH_ yeah
22:45 GuShH_ but he has tiny machines, it's mostly skill.
22:45 rue_shop3 hey I started a finger, where did it go?
22:46 GuShH_ o.o
22:47 GuShH_ "Rotary tables and mills are amazing things!" no shit. but try finding an old mill with all the accessories you want.
22:48 rue_shop3 which way did tiem go this week
22:48 rue_shop3 ahead is which way
22:48 rue_shop3 its later than it should be?
22:49 GargantuaSauce depends on how you define "should be"
22:49 GargantuaSauce the clocks moved forward
22:49 GargantuaSauce if you embrace timekeeping, it's earlier than it should be
22:49 GargantuaSauce if you cling to the rotation of the earth, it's later
22:50 TELunus|2 The easy way to think about what happend is that we lost sleep.
22:51 rue_shop3 I slept in till 11:00
22:51 GargantuaSauce it's nothing to be stressing about!
22:53 rue_shop3 hmm
22:53 rue_shop3 how to I constrain the chain to act like a finger
22:55 rue_shop3 not using chain in the first place is a good start
22:55 rue_shop3 I need to do this with something larger,
22:55 rue_shop3 maybe I could do soemthing the size of the mecha finger
23:01 rue_shop3 hmm 5 tendons for 1 finger
23:08 R0b0t1 lol hands
23:08 R0b0t1 you're fucked admit defeat now
23:09 ShH_ gives R0b0t1 the fi
23:09 GuShH_ HA!
23:09 R0b0t1 I am, wow
23:09 R0b0t1 so insulted
23:10 rue_shop3 the hands on the 12' mecha have fingers 9" long
23:10 ShH_
23:10 rue_shop3 so its not like its a tiny model
23:10 rue_shop3 I think 3/8 steel pipe will work
23:10 rue_shop3 but I dont have any, I'm playing with 1/2" and this looks plausable
23:11 rue_shop3 I might be abel to hit up the fittings shop this week
23:12 ShH_ pictures one big blob of m
23:12 rue_shop3 imagine a finger 9" long
23:12 rue_shop3 now imagine a 2 fingered, 1 thumb hand to scale
23:13 rue_shop3 about 16" or so from the long fingertip to the wrist
23:13 GuShH_ for what purpose?
23:13 rue_shop3 12' mecha
23:13 rue_shop3 being 12' high is handy
23:13 GuShH_ I ask again
23:13 GuShH_ you might be insane
23:13 rue_shop3 you can pick things up that are toherwise just too big to handl easily
23:14 GuShH_ Please move to Japan.
23:14 rue_shop3 and cleaning the gutter, easy
23:14 ShH_ facep
23:14 rue_shop3 and seriosly, what could make a cooler thing to hold up the house number at the end of the driveway when not in use?
23:14 GuShH_ well that sounds like a serious use for it.
23:15 GuShH_ fair enough.
23:15 rue_shop3 so you know if there is software to group bluetooth headsets into a walkie-talkie arrangemet
23:15 rue_shop3 for say, 10 or less headsets?
23:15 GuShH_ no clue
23:15 GuShH_ look into motorcycle bt headsets though
23:15 GuShH_ some have grouping features
23:15 rue_shop3 oh and for standing up strretlight poles at work
23:16 rue_shop3 would save TONNES of time
23:16 GuShH_ but often just to use with the passenger
23:16 GuShH_ and cheapies are wired
23:16 GuShH_ most of them these days just link to your phone...
23:16 rue_shop3 the idea is to have a comm ground around the mecha for working with people
23:16 ShH_ thinks rue is getting even more insane by the mi
23:17 rue_shop3 this is good, it means I'm going the right way
23:17 rue_shop3 if people thought my ideas were reasonable, they would have already been done
23:17 GargantuaSauce i think if you have a working 12' mech your day job will become quite irrelevant
23:17 GuShH_ haha
23:17 rue_shop3 this summer I'm gonna get the control cage rings done
23:17 rue_shop3 for SURE
23:17 rue_shop3 hell or high water
23:18 rue_shop3 or/and
23:18 rue_shop3 I dont care if I have to bend the damned pipe with the truck
23:18 GuShH_ can you imagine rue on cocaine?
23:18 rue_shop3 ok I have to go prep supper
23:22 GuShH_ I have to go watch the simpsons... make myself fat with some snacks and sleep.
23:22 GuShH_ that's what you do when you are single.
23:24 rue_more oh where is my netflix then
23:25 GargantuaSauce as if a gushhette would preclude such an activity
23:32 R0b0t1 sooo
23:32 R0b0t1 is rue_more actually building a giant mecha
23:32 R0b0t1 does it have lasers?