#robotics Logs
Mar 03 2017
#robotics Calendar
12:16 AM synja: "Unknown problem somewhere in the system."
12:18 AM synja: well, THAT Is specific...
12:18 AM SpeedEvil: Shaft coupler made of what.
12:19 AM synja: justanotheruser, let it sit somewhere warmer than where you installed it
12:21 AM synja: or try to heat up the coupler without heating up the shaft
12:21 AM synja: but yes, wd40 is always a go-to fix
12:31 AM Snert: torch it with a bic :)
12:31 AM justanotheruser: warmer will expand the metal though?
12:31 AM synja: that's what you want
12:31 AM justanotheruser: won't that bind it further?
12:31 AM synja: no
12:31 AM Snert: loctite might make it even more stubborn
12:31 AM justanotheruser: if two fat people are stuck in a doorway and they both eat more and expand, then they'll be more stuck!
12:31 AM justanotheruser: I do not have intuition for this
12:32 AM synja: well, if you need it to expand, heat it. if you need it to contract, cool it
12:32 AM synja: pick one
12:32 AM justanotheruser: what I'm asking is why I would want it to expand
12:33 AM synja: shaft is in the middle?
12:33 AM justanotheruser: yes
12:35 AM synja: then if it expands out, it will give more room for the shaft to come out
12:35 AM justanotheruser: you're saying it will stretch the walls?
12:36 AM justanotheruser: maybe I should leave it outside for 2 hours
12:36 AM synja: either do that, or take a hammer and wd40 to it
12:36 AM synja: well if the shaft and coupler is same material, they will expand together
12:36 AM synja: solves nothing
12:37 AM synja: if coupler is more heat conductive than shaft, then take a torch to it
12:38 AM rue_house: cnc is ok with 1.8" bit, but needs oil flood
12:41 AM justanotheruser: but won't the couple expand inwards as well?
12:41 AM justanotheruser: I think I'll try freezing it first
12:41 AM Jak_o_Shadows: How easily can you reuse coolant anyway?
12:42 AM synja: more room to expand out, justanotheruser
12:42 AM synja: freezing it will just make it tighter
12:42 AM synja: unless you can freeze the shaft only, which is kinda rediculous
12:42 AM Snert: freeze mist maybe...but doubt you'd have that.
12:43 AM Jak_o_Shadows: Of course, depends on the two materials. Heat is a decent option. I'd tend towards brute force, but mostly because I probably couldn't heat
12:43 AM synja: ^
12:45 AM synja: ANOTHER case where keeping liquid N would come in handy...
12:45 AM Snert: 2 pairs of vise grips?
12:47 AM rue_house: something about how google does "no, I didn't find anything by what you asked for, so here are 19000 unrelated results!"
12:47 AM synja: remove the shaft & coupler, clamp the coupler, find a metal rod and pound that against the shaft
12:47 AM synja: rue_house, i think you're the only person i've heard from that can't find decent results from google
12:48 AM Snert: all my answers were googleFree.
12:48 AM rue_house: justanotheruser, wait, how did you get it on?
12:48 AM justanotheruser: I pushed it on
12:48 AM rue_house: find "moe kilimi" he rewinds motors
12:48 AM rue_house: justanotheruser, hard or just by hand?
12:48 AM justanotheruser: just by hand
12:48 AM synja: yikes, rue_house
12:48 AM rue_house: will it twist at all?
12:48 AM justanotheruser: I have much better grip pushing it on than pulling it off
12:48 AM justanotheruser: rue_house: it is keyed
12:48 AM rue_house: will it twist at all?
12:49 AM rue_house: .000001 degrees?
12:49 AM justanotheruser: I'd have to check my microscope
12:49 AM rue_house: if even a tiny bit, soak it in oil and twist a lot while pulling
12:49 AM synja: snert's vice grip answer sounds more appealing now
12:50 AM rue_house: if you hammer on the end of the shaft, it'll flare, and never wanna come out
12:50 AM justanotheruser: I'll turn my heat up to 90, soak it in oil, twist it and sacrifice a goat tomorrow
12:50 AM justanotheruser: whats the best oil
12:50 AM rue_house: wait for a full mon
12:50 AM Snert: a drift punch too maybe.
12:50 AM rue_house: moon
12:50 AM justanotheruser: this is a fancy motor so maybe I should use olive oil
12:50 AM rue_house: a punch will flare the shaft
12:50 AM justanotheruser: instead of plebian vegetable oil
12:50 AM rue_house: its a great way to lock things into holes
12:50 AM synja: rue_house, i've never had any trouble
12:50 AM rue_house: oooh its on a motor
12:51 AM justanotheruser: yep
12:51 AM rue_house: k, how much space is there between the coupling and the motor body
12:51 AM justanotheruser: less than 1mm
12:51 AM Snert: have you tried prayer?
12:51 AM synja: lol
12:51 AM justanotheruser: Snert: no
12:51 AM Snert: lol :)
12:51 AM rue_house: your screwed
12:51 AM rue_house: why do you want it of?
12:51 AM rue_house: off?
12:51 AM justanotheruser: thats why I have bad grip
12:51 AM rue_house: so you can put it back on?
12:52 AM rue_house: do not pull against the motor, you will ruin the bearings
12:52 AM justanotheruser: rue_house: mount a new mounting bracket
12:52 AM synja: ^
12:52 AM rue_house: get a mounting bracket with a bigger hole
12:52 AM justanotheruser: too late for that
12:52 AM synja: lol
12:52 AM justanotheruser: its a planetary gear
12:52 AM justanotheruser: is that better or worse
12:52 AM rue_house: well if you rauined the bearings, throw them both out and start again
12:52 AM synja: kinda worse
12:52 AM justanotheruser: that sucks
12:53 AM justanotheruser: I'll just increase the hole size in the mounting bracket
12:53 AM justanotheruser: so its a bad idea to oil it up and try again tomorrow?
12:53 AM rue_house: yea, but you said you wrecked the bearings?
12:53 AM justanotheruser: No I didn't
12:53 AM rue_house: ok
12:53 AM synja: i bet if you try anything i said, it will work
12:53 AM rue_house: bigger hole
12:54 AM justanotheruser: I think you guys were implying I wrecked it though
12:54 AM synja: actually you won't have enough leverage for the heat
12:54 AM rue_house: if you hammer on the shaft your screwed
12:54 AM synja: so go with the clamp/pound
12:54 AM rue_house: mostly cause it ruins the bearings
12:54 AM synja: again, never had a problem before
12:54 AM synja: sounds like he's screwed anyway
12:54 AM rue_house: best is to have something like a gear puller to push it out
12:54 AM justanotheruser: rue_house: I used the end of the hammer to try to pull it out
12:55 AM synja: nope
12:55 AM synja: nope nope nope
12:55 AM rue_house: the bearings still turn?
12:55 AM justanotheruser: no clue, haven't tried
12:55 AM rue_house: most never put force on the bearing
12:55 AM synja: use two hammers if you're doing that justanotheruser
12:55 AM synja: on each side
12:55 AM rue_house: do NOT use a gear puller aginast the motor
12:55 AM synja: equal force
12:55 AM rue_house: dont do that
12:55 AM justanotheruser: synja: I tried two flathead screw drivers as well
12:55 AM justanotheruser: it wouldn't budge
12:55 AM rue_house: you must NOT use the motor to pull against, it'll ruin the bearings
12:56 AM justanotheruser: ok, I'll oil it up and push down on the motor while pulling up
12:56 AM synja: that won't solve it
12:56 AM justanotheruser: push down on the shaft*
12:56 AM rue_house: but dont hammer on it
12:56 AM rue_house: can you take a picture?
12:56 AM rue_house: justanotheruser, ?
12:56 AM synja: rue_house, you say what NOT to do, but not what to do
12:56 AM synja: such a pessimist
12:57 AM rue_house: synja, I'v ruined LOTS of GREAT motors
12:57 AM synja: i'm saying if he's going with the hammer, then he should do it from both sides
12:57 AM rue_house: I made a special puller
12:57 AM synja: ideally he would use the clamp/pound as i suggested though
12:57 AM rue_house: synja, and that will ruin the bearings
12:57 AM rue_house: no pounding, it'll flare the shaft it its stuck hard enough
12:58 AM rue_house: push, not pound
12:58 AM synja: yeah...
12:58 AM Snert: 3jaw puller if one handy
12:58 AM synja: drive it further down
12:58 AM rue_house: justanotheruser, do you have a bench vise?
12:58 AM justanotheruser: rue_house: https://imgur.com/a/lr5Um
12:58 AM rue_house: hah, wholy crap, good one!
12:58 AM justanotheruser: ?
12:59 AM rue_house: justanotheruser, do you have a bench vise?
12:59 AM justanotheruser: whats a good one
12:59 AM rue_house: its a high quality screw up
12:59 AM justanotheruser: if it's necessary I could go somewhere that has one
12:59 AM synja: rue_house, i've taken off many couplers with that clamp/pound technique with ZERO issues after
12:59 AM rue_house: but you can modify your own to push that out
12:59 AM synja: maybe i got lucky, but there was nothing else to do
12:59 AM justanotheruser: rue_house: it's a pretty big motor
01:00 AM synja: what is it? 1/2hp?
01:00 AM rue_house: synja, if you shock the shaft into the motor, you USUALLY ruin the bearings and sieze the motor
01:00 AM rue_house: no, nema23
01:00 AM synja: idk about usually
01:00 AM rue_house: ... maybe
01:00 AM rue_house: justanotheruser, whats the dia of that coupler?
01:01 AM justanotheruser: synja: 1.12hp
01:01 AM rue_house: oo
01:01 AM synja: that's a large coupler then
01:01 AM justanotheruser: yes
01:01 AM synja: jeez
01:01 AM rue_house: justanotheruser, whats its diameter to the nearest cm
01:02 AM synja: ..
01:02 AM synja: 8-10?
01:02 AM justanotheruser: rue_house: 3 21/64"
01:02 AM justanotheruser: whatever that is in cm
01:02 AM rue_house: ok, your kinda luckey its so big
01:02 AM synja: little more than 8
01:02 AM synja: i dink
01:02 AM rue_house: would you post a pic of the end of it?
01:03 AM justanotheruser: 8.453cm
01:03 AM synja: what's that gonna do for you rue?
01:03 AM rue_house: its about 8cm
01:03 AM justanotheruser: rue_house: isn't that what I did?
01:03 AM rue_house: he might be able to drill in a retainer for a press-plate
01:03 AM rue_house: no, from the end, you took a side pic
01:03 AM justanotheruser: oh
01:04 AM rue_house: synja, its only an option cause its so big
01:04 AM rue_house: or even...
01:04 AM rue_house: justanotheruser, do you have two C clamps that can span the 8cm?
01:05 AM rue_house: 3.5" or larger C flamps
01:05 AM justanotheruser: https://imgur.com/a/BK8C9
01:05 AM rue_house: and some 5/16 theaded rod and a nut and a washer
01:05 AM rue_house: (or 8mm)
01:05 AM synja: i give him 85% chance of success without damaging the motor with heating up the outside of the coupler, putting it in a clamp with the motor below, with a flat metal piece banged against the shaft
01:06 AM rue_house: mm its center drilled...
01:06 AM synja: pretty damn confident
01:06 AM justanotheruser: synja: should I rub sensual oils to lubricate it
01:06 AM rue_house: justanotheruser, C clamps?
01:06 AM rue_house: and some 5/16 theaded rod and a nut and a washer
01:06 AM synja: if you're planning on sticking it up your ass later, sure
01:06 AM justanotheruser: rue_house: I have everything if I travel 20 minutes from where I am
01:07 AM justanotheruser: but I'd rather not
01:07 AM justanotheruser: synja: thats why I need 1.12hp
01:07 AM rue_house: how do you build things without having things like threaded raod?
01:07 AM rue_house: hmm
01:07 AM justanotheruser: rue_house: first I send files to a machinist, then I pick them up
01:08 AM rue_house: well, I cant help you make this with just a toaster, chicken and a candle
01:08 AM justanotheruser: what about oil and a lighter
01:08 AM rue_house: send it off to the machinist and get him to take it off then...
01:08 AM justanotheruser: yeah, that might work best
01:08 AM synja: rue_house, it seems like you have a lot of money, so you don't always go for the macguever fix
01:09 AM justanotheruser: he can afford 6 irc clients
01:09 AM rue_house: I also hav a mortguage
01:09 AM rue_house: and I make my own stuff!
01:09 AM justanotheruser: though I guess irc clients are only like $1.30 for the cheaper ones https://www.microsoft.com/en-us/store/p/irc-explorer/9wzdncrdkmgz
01:10 AM rue_house: justanotheruser, you dont ahve a cnc machine or laser cutter eh?
01:10 AM synja: lol
01:10 AM justanotheruser: rue_house: 20 minutes away I have a hackerspace membership
01:10 AM rue_house: wtf you talking about, freaking free irc...
01:10 AM rue_house: justanotheruser, well go surround yourself in tools and I can help you get it off safely
01:10 AM synja: i had to make a tms out of old disposable cameras for my eeg
01:10 AM rue_house: BUT, its almost exactly 1 hour past my bed time
01:11 AM synja: works better than store bought too
01:11 AM justanotheruser: thanks so much for your help
01:11 AM justanotheruser: both of you
01:11 AM synja: you're just going to pay to get it off
01:11 AM synja: aren't you
01:11 AM synja: pay dearly, i may add
01:11 AM justanotheruser: I'm going to try your trick for free, then when that fails I'm going to pay
01:11 AM synja: well, i suppose if you have the money, outsourcing is the way to do it
01:11 AM synja: fair enough
01:12 AM synja: if*
01:12 AM justanotheruser: I'm not made of money, I went for the cheap irc client
01:12 AM rue_house: I would help you make a special puller to get it off with a screw
01:12 AM rue_house: oooh, you people have to buy apps
01:12 AM rue_house: hahahahahahahaha
01:12 AM synja: ?
01:13 AM synja: i buy only what i can't make
01:13 AM justanotheruser: is there a good place listing shared shops?
01:13 AM rue_house: I'v not bought one program in .... since back in shareware days, which your prolly too young to know about
01:13 AM justanotheruser: All the hacker spaces are fairly far from me
01:13 AM synja: as if
01:13 AM synja: i've never bought a program
01:14 AM rue_house: I thought you said it was 20 mins?
01:14 AM justanotheruser: that is fairly far
01:14 AM synja: what are you on? a bike?
01:14 AM justanotheruser: train or uber
01:14 AM rue_house: if your going to build things, you should get the tools and parts you need
01:14 AM synja: ah
01:14 AM synja: not everyone has money to spend on such tools, rue_house
01:14 AM synja: shocker. i know
01:15 AM justanotheruser: rue_house: that would be like $14k/y
01:15 AM rue_house: not likley
01:15 AM justanotheruser: rue_house: I am only counting the new room I would need in my apartment
01:15 AM justanotheruser: right now I just store shit in the little storage space I have and my bedroom
01:16 AM synja: ...what are you using the motor for?
01:16 AM justanotheruser: though when I move out I'll probably look for somewhere where I can get a 2 br cheap
01:16 AM justanotheruser: synja: didn't I already say?
01:16 AM rue_house: you have a 1 room apartment with a toilet under the fold down bed and a fold down kitchen/desk combination?
01:16 AM synja: oh god. the sex thing....
01:16 AM justanotheruser: rue_house: lol nah, I'm not that efficient
01:16 AM justanotheruser: I have like 850 sq ft, just no where good to put it
01:17 AM rue_house: tahts larger than my shop, how much space do you take up?
01:18 AM rue_house: my shop is 480
01:18 AM justanotheruser: well my bed and my desks take up most of my bedroom wallspace
01:18 AM rue_house: then put your bed over your desk
01:18 AM justanotheruser: my bed wouldn't fit there
01:18 AM rue_house: http://ruemohr.org/~ircjunk/house/dscn7993.jpg
01:19 AM justanotheruser: I have a queen
01:19 AM rue_house: (I did put a matress on it and stuff, that was an early pic)
01:19 AM justanotheruser: Oh, I thought you slept on wood
01:19 AM rue_house: its a long single, that way there is room for my laptop
01:19 AM rue_house: rue_bed,
01:19 AM justanotheruser: I like the setup
01:20 AM synja: that's a rather small desk
01:20 AM Jak_o_Shadows: You know the people who make vans, small buses, etc into houses?
01:20 AM rue_house: you just DONT stand up from the desk
01:20 AM Jak_o_Shadows: I sorta wan tto do that
01:20 AM synja: but it's an efficient way for space
01:20 AM rue_house: <---- theBear,
01:20 AM synja: how many times did it take you to remember that, rue?
01:20 AM rue_house: its his fault
01:20 AM rue_house: he got me into it, but HE has a 12' cieling!
01:21 AM justanotheruser: this is the desk occupying my room http://imgur.com/a/Y42h9
01:21 AM rue_house: looots of room
01:21 AM synja: jeez
01:21 AM synja: what are you on? the 20th floor?
01:22 AM rue_house: see, if you'd built your own 3d printer, you would have the 5/16 rod you need now
01:22 AM Jak_o_Shadows: ike, it'd be nice to have a little car that's got a bed, some storage space, a sink
01:22 AM rue_house: WHAT DID YOU SAVE!!! WHAT DID YOU SAVE!!!!
01:22 AM justanotheruser: more recently I have moved the keyboard and setup a parts drawere and scattered electronics where it was
01:22 AM justanotheruser: rue_house: actually the most prime space for room is probably my living room
01:22 AM rue_house: I cant see ONE 3d printed thing in that pic
01:22 AM justanotheruser: synja: about 50% more
01:23 AM synja: you either don't use your computers or your 3d printer that much
01:23 AM synja: noisy fuckers, they are
01:23 AM justanotheruser: I don't use it much, I put it in my close
01:23 AM justanotheruser: t
01:23 AM Jak_o_Shadows: smell too
01:23 AM synja: ^
01:23 AM justanotheruser: it was briefly a cool noverty
01:23 AM justanotheruser: def not worth buying and building though
01:23 AM rue_house: whaaaat?>
01:23 AM justanotheruser: rue_house: here is where most of my potential space is IMO
01:23 AM justanotheruser: http://i.imgur.com/z7gguWF.jpg
01:23 AM synja: i need to steal back my 3d printer from a library i donated it to
01:24 AM rue_house: your just not creative enough to understand what you can use it for
01:24 AM synja: they use it as a paperweight
01:24 AM rue_house: justanotheruser, do you ever have more than 3 visitors?
01:24 AM synja: lol
01:24 AM justanotheruser: rue_house: yes
01:25 AM rue_house: then I'd suggest not taking over the living room
01:25 AM justanotheruser: it's rare though
01:25 AM justanotheruser: usually its 1-2
01:25 AM rue_house: no 3d printed lamp
01:25 AM justanotheruser: you think I should redo my bedroom?
01:25 AM rue_house: no 3d printed coasters
01:25 AM Jak_o_Shadows: rue, dude, 3D printers are for functional things
01:25 AM rue_house: no 3d printed art
01:26 AM justanotheruser: stop trying to make 3d printers a thing, it's not happening
01:26 AM synja: i agree with jak
01:26 AM rue_house: you should see my place
01:26 AM rue_house: gees
01:26 AM justanotheruser: we're not geese
01:26 AM rue_house: you cant go anywhere without something 3d printed
01:26 AM Jak_o_Shadows: I'm a magpie thank you very much.
01:26 AM rue_house: I ahve a strainer in the bathroom sink
01:26 AM Jak_o_Shadows: Yours is working better than mine to be fair
01:27 AM justanotheruser: rue_house: ok, so my bed weighs over 200lbs, what do you recommend. Getting rid of the bed is out of the question
01:27 AM justanotheruser: should I make the desk more space efficient?
01:27 AM rue_house: I have a thermostat by the fridge
01:27 AM Jak_o_Shadows: justanotheruser, do you have a weight limit per floor
01:27 AM synja: looks like you barely use it, justanotheruser
01:27 AM justanotheruser: synja: why do you think that
01:27 AM rue_house: you need a top bunk
01:27 AM synja: you have non-important things stretched out across it
01:28 AM synja: nothing is compact
01:28 AM rue_house: yea, place looks empty and devoid of life
01:28 AM justanotheruser: lol
01:28 AM synja: heh
01:28 AM justanotheruser: the 3d printer I will agree is nonimportant
01:28 AM rue_house: if you use a livingroom, its not that bare
01:28 AM rue_house: but the plant isn't dead
01:28 AM synja: a few weeks ago i dreamed of an ultimate workspace
01:28 AM justanotheruser: which is why I removed it
01:28 AM synja: oddly, it was all white...
01:29 AM justanotheruser: I mostly just keep everything pretty clean
01:29 AM rue_house: you just cant imagine what you can do with it
01:29 AM synja: no the 3d printer is important
01:29 AM justanotheruser: nah
01:29 AM rue_house: or you would be using it for everything
01:29 AM * Jak_o_Shadows wonders if they have a CAD model of a 9g servo anywhere
01:29 AM synja: i'm sure of it
01:29 AM rue_house: duh, yes
01:29 AM justanotheruser: see the desk on the right?
01:29 AM synja: no use in making it though
01:29 AM justanotheruser: I want to tilt that 90 degrees
01:29 AM synja: for how cheap they are
01:29 AM justanotheruser: then behind it in the corner have my workshop
01:30 AM justanotheruser: what you think of that
01:30 AM synja: tilt?
01:30 AM justanotheruser: rotate*
01:30 AM synja: oh
01:30 AM synja: lol
01:30 AM justanotheruser: (╯°□°）╯︵ ┻━┻
01:30 AM synja: idk. depends on what you do
01:31 AM synja: brb
01:31 AM justanotheruser: (╯°-°）╯︵ [
01:31 AM justanotheruser: ┬─┬ノ( º _ ºノ)
01:31 AM justanotheruser: there we are
01:31 AM rue_house: my buddy pointed out that if people dont know how to create things to print, and they havn't the imagination, they will find 3d printers useless
01:32 AM rue_house: and only buy them as a fad
01:32 AM rue_house: I been using my printers for years now, and I'm still comming up with things I didn't think of just printing
01:32 AM justanotheruser: or you realize that to make something that has utility and isn't just for shot glasses, coasters and art you need to machine things
01:32 AM rue_house: http://ruemohr.org/~ircjunk/images/p1070276.jpg
01:32 AM rue_house: like gearboxes
01:33 AM justanotheruser: anyways, thanks for the help, i'll try these solutions tomorrow. gn
01:33 AM rue_house: that was like (8-O
01:33 AM rue_house: http://ruemohr.org/~ircjunk/images/p1070275.jpg
01:33 AM rue_house: http://ruemohr.org/~ircjunk/images/p1070272.jpg
01:33 AM Jak_o_Shadows: Or complex 3D shapes
01:33 AM rue_house: http://ruemohr.org/~ircjunk/images/p1070061.jpg
01:33 AM rue_house: project boxes
01:34 AM Jak_o_Shadows: Oooh, I should print some HDD mounts
01:34 AM rue_house: try to think of it like this, it can make ANYTHING thats small and made of plastic
01:34 AM Jak_o_Shadows: Also damn rue, that's neat.
01:34 AM rue_house: which is like 80% of the world
01:34 AM Jak_o_Shadows: I am very impressed by that last one.
01:34 AM rue_house: http://ruemohr.org/~ircjunk/images/p1070060.jpg
01:35 AM rue_house: http://ruemohr.org/~ircjunk/images/p1070056.jpg
01:35 AM rue_house: tractor tread
01:35 AM rue_house: I was like !!!!!!!
01:35 AM Jak_o_Shadows: Could I see teh front of that box?
01:35 AM rue_house: cause, there is no other way to make it without 10000000 parts
01:35 AM rue_house: http://ruemohr.org/~ircjunk/images/p1070058.jpg
01:35 AM rue_house: that front?
01:35 AM Jak_o_Shadows: Yup!
01:36 AM Jak_o_Shadows: Yeah. That usb (usb serial?) is such a good idea!
01:36 AM rue_house: mhmm
01:37 AM rue_house: a bit of ] bent sheet metal for the top
01:37 AM synja: i had to design/print a servo holder for my engine, so i could remotely operate a vacuum pump with it's attached tracfone
01:38 AM synja: macguever 101
01:38 AM rue_house: zippo:/morfiles/objects# ls -lrt|wc -l
01:38 AM rue_house: 233
01:38 AM synja: you might think it stupid, but i like sketchup
01:38 AM rue_house: I'v designed about 220 of those things
01:39 AM synja: you can make anything with it relatively easily
01:39 AM synja: what do you use rue?
01:39 AM rue_house: http://www.thingiverse.com/thing:1964013
01:39 AM rue_house: I use librecad and then take it into openscad for 3d
01:39 AM rue_house: its MUCH faster to generate than just openscad
01:40 AM synja: never used it
01:40 AM rue_house: I wont say openscad is amazing.
01:41 AM rue_house: http://www.thingiverse.com/rue_mohr/designs
01:41 AM synja: whatever works, right?
01:42 AM rue_house: I'm gradually working on posting most of the things I'v designed
01:42 AM synja: oh shiznit it's getting late
01:42 AM synja: and i spent much of my free time here on irc again
01:42 AM synja: ...
01:42 AM rue_house: TWIST TIE
01:42 AM rue_house: I go where others wont.
01:42 AM synja: yeah i saw that. was it supposed to be sardonic?
01:43 AM rue_house: ?
01:43 AM synja: you didn't really print out a twist tie, did you?
01:43 AM rue_house: yes
01:43 AM rue_house: about 30 of them so far
01:43 AM synja: pre-flexed?
01:43 AM rue_house: no, its a quick print, about 4 traces each
01:43 AM rue_house: and they hold
01:44 AM rue_house: I was amazed
01:44 AM synja: or wtf kind of material are you using to twist them
01:44 AM rue_house: (8-O
01:44 AM rue_house: its just pla
01:44 AM synja: i have a "thing" for twist ties. big time collector
01:45 AM rue_house: lengths up to 20cm
01:45 AM synja: probably b/c i have so many loose cables
01:45 AM rue_house: for a standard printer
01:45 AM rue_house: actually
01:45 AM synja: well g2k
01:45 AM rue_house: sqrt(800)
01:46 AM synja: anyways, i have to stop while i'm behind. need my 4 hours of sleep
01:46 AM rue_house: oh fff
01:46 AM rue_house: your right
01:46 AM rue_house: gnight
01:49 AM Jak_o_Shadows: night
02:42 AM Jak_o_Shadows: Love it when you parametise a model enough that You can just change the one number, hit export, and print it, rather than fiddling around
02:45 AM Jak_o_Shadows: deshipu, you're totally right about it being underactuated and annoying. But for the shoulder (splay), it's mostly because the linkages would hit each other.
02:45 AM Jak_o_Shadows: So if i just put them at different heights, I might getg away with it not too badly
02:46 AM deshipu: Jak_o_Shadows: can't wait to see where you take it
02:47 AM Jak_o_Shadows: I'm hoping to get either the "ribs" (stewart platform linkages) designed this weekend, or the legs
02:47 AM Jak_o_Shadows: through, one point - Should I have the knees inwards, or outwards?
02:48 AM Jak_o_Shadows: cats are inwards I think, but I think I really need ankles if I do that - possibly active ankles as well
02:48 AM Jak_o_Shadows: (which I was looking to avoid)
02:51 AM deshipu: cats have knees and ankles
02:51 AM deshipu: knees are invards, ankles are outwards
02:51 AM deshipu: so it depends if your knees are to emulate cat's knees or ankles
02:51 AM deshipu: you could also do both with a single servo and parallel linkages
02:52 AM deshipu: https://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Skeleton_of_a_dog_diagram.svg/1052px-Skeleton_of_a_dog_diagram.svg.png
02:53 AM deshipu: each leg is a Z
02:59 AM Jak_o_Shadows: The problem is the bit after the ankle is so damn long
03:00 AM Jak_o_Shadows: I was hhoping to do the ankle with springs and linkages
03:09 AM deshipu: probably best to not follow nature too closely
03:09 AM deshipu: it uses different materials and different solutions are optimal for it
03:11 AM Jak_o_Shadows: aye.
03:11 AM Jak_o_Shadows: Hoping I can use teh spine to make the movement a little faster though
03:43 AM SpeedEvil: http://imgur.com/gallery/PN7Rvcv - the various skeletons of mammals and how they are arranged is interesting.
03:50 AM z64555: I read somewhere from an artist that stated that all mammals basically have the same skeletal system, but in different shapes
03:51 AM z64555: dogs, cats, human, monkeys, all have 5 phallanges (fingers), for example
03:54 AM deshipu: that's not true
03:55 AM deshipu: for instance, guinea pigs have 5 fingers on front paws and 4 fingers on hind
03:55 AM deshipu: (or was that 4 and 3? can't remember)
03:55 AM deshipu: yeah, 4 on front and 3 on hind
03:56 AM deshipu: pigs are the same
03:58 AM z64555: hm, poor example
03:59 AM z64555: *I had chosen a poor example
04:02 AM Jak_o_Shadows: hmm
04:03 AM deshipu: all insects also have the same configuration of legs
04:04 AM deshipu: 2 pairs of wings, six pairs of walking legs, 2 pairs of mandibles
04:04 AM deshipu: though some might atrophy in some species, of course
04:04 AM deshipu: and yes, a centipede is not an insect
04:05 AM deshipu: 3 pairs of walking legs
04:05 AM deshipu: ugh, I need to wake up
04:20 AM Jak_o_Shadows: https://www.youtube.com/watch?v=7OPdlsOcN6s&feature=youtu.be deshipu, first go
04:21 AM Jak_o_Shadows: Dunno how best to attach the rod ends. Don't know the joint limits yet. May have to rotate how they attach my 90
04:21 AM Jak_o_Shadows: Also, obviously, there's only two legs there. Should be 6. Also, the servos may want to be on the inside.
04:22 AM Jak_o_Shadows: Through, if you run the force calcs, you REALLY don't want to equal links
05:57 AM Jak_o_Shadows: Hmm, deshipu, initially I could put a couple of potentiometers in the middle there as well. Or just one. That'd be somewhat nifty
08:17 AM rue_bed: the servos already have pots
08:17 AM rue_bed: off a reference voltage
08:17 AM rue_bed: did nobody read my servos 101?
09:48 AM rue_house: http://ruemohr.org/~ircjunk/tutorials/elex/hobbyservo/servo101.html
09:49 AM rue_house: see pin 13, its a regulated 2.5V
09:49 AM rue_house: see the feedback pot?
09:49 AM rue_house: goes from ground to pin 13
09:49 AM rue_house: so, the pot in a servo will be across a fixed 2.5V supply
09:03 PM synja_ is now known as synja
09:10 PM synja_ is now known as synja
09:10 PM Tom_itx is now known as Tom_L
11:27 PM rue_shop3: channel slept for a whole day?