#garfield Logs
Apr 22 2020
#garfield Calendar
12:27 AM zhanx: rue_mohr, v
12:32 AM zhanx: https://www.youtube.com/watch?v=nbKG9SjZjvQ
12:39 AM rue_bed: part of the challenge is how to print them
12:40 AM zhanx: rue_bed, true
12:41 AM zhanx: where i am at now https://i.imgur.com/ACxqYXf.png
12:41 AM zhanx: channels for bearings are done, wiring next
01:07 AM rue_bed: ok
01:07 AM rue_bed: your tumbling around in a dryer, see how ya do
01:18 AM zhanx: badly rue_bed
01:18 AM zhanx: wiring channels done
01:41 AM rue_bed: :)
01:42 AM zhanx: spent a bit of time on this, inverted it so you can see it
01:45 AM zhanx: rue_bed, https://i.imgur.com/TK9nxkW.png
02:17 AM zhanx: it fits fine
06:32 AM polprog: whats the best way to join the tabs on the ni-cd? do i have to use a spot welder or can i carefully solder them
06:32 AM polprog: ?
06:33 AM polprog: the tabs are about 1/2"
08:20 AM rue_bed: if there are already tabs you can solder them togethor,
08:21 AM rue_bed: but you need to spot weld on the tabs themselvs, soldering overheats the battery
08:21 AM polprog: the tabs are spot welded
08:21 AM polprog: okay
10:20 AM aandrew: there, 1400va ups has batteries replaced, I made damn sure that the screws were tight as fuck, 99% sure they were last time too but that one negative terminal looks like it overheated
10:50 AM aandrew: so mouser and digikey both arrived at the same time. now I have lots of parts. :-)
10:50 AM aandrew: including some attinys
12:19 PM Tom_L: sensory overload
12:24 PM aandrew: also I think I know why my airflow detector stopped working
12:25 PM aandrew: I used silicone to "glue" the transistors into place, I wonder if the silicone curing has mangled them
02:08 PM rue_mohr: hmm, its acid based eh?
02:09 PM rue_mohr: did you do that circuit verbatum then?
02:32 PM rue_mohr: aandrew, those sensors are supposed to be mems aren't they?
02:34 PM rue_mohr: ok, apocalypse motor driver then
02:36 PM rue_mohr: yik, the LMD18200, the "good driver" has 0.3 ohms rdsOn
02:37 PM rue_mohr: I swear I shouldn't have to jig something to get good performance
02:40 PM Tom_L: huh, i got a few of those iirc
02:41 PM rue_mohr: yea, their not that awesome
02:41 PM rue_mohr: I used to regard them as the good ones
02:41 PM rue_mohr: whats the other one
02:41 PM rue_mohr: popular
02:42 PM rue_mohr: 3xx
02:42 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/motors/hb1.jpg
02:43 PM rue_mohr: yea, there is a bipolar version, loses about 1.2V
02:43 PM rue_mohr: 398?
02:43 PM Tom_L: iirc those were samples
02:44 PM rue_mohr: 389?
02:44 PM Tom_L: dunno
02:44 PM rue_mohr: there is another chip just like that one
02:44 PM rue_mohr: LMxxxx
02:45 PM rue_mohr: L298
02:45 PM rue_mohr: I hate the voltage drop on it
02:46 PM rue_mohr: ok, at 2A the L298 drops 4.9V
02:46 PM rue_mohr: the 19200 drops 1.2
02:47 PM rue_mohr: er 18200
02:47 PM rue_mohr: and my discrete driver drops less than 0.5
03:01 PM polprog: sillicone may release acetic acid when bonding iirc
03:01 PM rue_mohr: I'v been sure to keep it away from metal
03:01 PM rue_mohr: I'v had it corrode thigns
03:02 PM rue_mohr: hmm the tiny13 is one pin short
03:02 PM polprog: im tired
03:02 PM rue_mohr: yea me too
03:03 PM rue_mohr: I want to build two of those motor drivers so that project can move along
03:03 PM rue_mohr: so, if I want the motor driver to be atleast 90% efficient
03:03 PM rue_mohr: and I'm driving 12V at 2A
03:04 PM rue_mohr: so 21.6w to the motor
03:04 PM rue_mohr: is 1.2V loss total
03:04 PM polprog: I need to solder the nicad charger prototype.. need to find 3k and 33k resistors, 0603
03:04 PM polprog: ill guess ill stack 3 10k and 3 100k
03:04 PM rue_mohr: have an old printer?
03:04 PM rue_mohr: inkjet?
03:05 PM polprog: huh?
03:05 PM polprog: yeah, somehwere
03:05 PM rue_mohr: old inkjet printer pcb
03:05 PM polprog: right
03:05 PM rue_mohr: probably have enough
03:05 PM polprog: i have some scrap pcbs
03:05 PM polprog: why inkjet specifically?
03:05 PM rue_mohr: sorry, I meant laser
03:05 PM rue_mohr: I'm apparently tired
03:05 PM polprog: i have a great board full of SMD parts.. from an old exchange
03:06 PM rue_mohr: lasers typically have more complex boards
03:06 PM polprog: but they have adhesive.
03:06 PM polprog: rip
03:06 PM rue_mohr: ?
03:06 PM rue_mohr: on the parts?
03:06 PM polprog: they use SMD adhesive
03:06 PM polprog: double sided densly packed board
03:06 PM rue_mohr: oh, on the baords
03:06 PM rue_mohr: yea, it'll come free
03:06 PM polprog: thanks for the adapters idea btw
03:06 PM polprog: they came out great
03:06 PM rue_mohr: ok
03:07 PM rue_mohr: ... it was my idea?
03:07 PM polprog: i think? or Tom's
03:07 PM rue_mohr: k
03:08 PM polprog: how does that single transistor oscillator of yours work>
03:08 PM rue_mohr: heh, which one?
03:08 PM rue_mohr: the delay one?
03:08 PM polprog: https://pbs.twimg.com/media/EWK2AXNUYAE8xe7?format=jpg&name=large
03:08 PM polprog: this one
03:08 PM rue_mohr: with the inductor and the two caps
03:08 PM rue_mohr: yea
03:08 PM rue_mohr: so
03:08 PM polprog: i should read on the art of electronics.. this kinda circuit grinds my gears
03:08 PM rue_mohr: do you know about delay lines?
03:09 PM polprog: and i have no idea where to start
03:09 PM polprog: oh wait
03:09 PM polprog: haha
03:09 PM rue_mohr: see it?
03:09 PM polprog: youre genius.. that IS a delay line there
03:09 PM polprog: hahaha
03:09 PM rue_mohr: yea
03:09 PM rue_mohr: I was playing with the opto ocsillator
03:09 PM rue_mohr: and when I got it to go, I realized it was running as a broken delay line
03:09 PM rue_mohr: so I made it a proper delay line and it lit right up
03:10 PM polprog: idea
03:10 PM rue_mohr: while staring at it, I thought "why dont I just use a normal transistor then?"
03:10 PM polprog: ill make a ring oscillator outta optocouplers
03:10 PM rue_mohr: so, thats what that is
03:10 PM rue_mohr: hah
03:10 PM polprog: i have quite some optos
03:11 PM rue_mohr: ok
03:11 PM rue_mohr: they are slow, I look forward to seeing how that goes
03:11 PM rue_mohr: I expect you cant get over 200kHz
03:11 PM rue_mohr: if more than 50k
03:12 PM polprog: we'll see
03:13 PM polprog: ltv847
03:13 PM polprog: i have some optos
03:13 PM rue_mohr: I have lots of PC817
03:14 PM polprog: this one doesnt sit too well
03:27 PM polprog: 28khz @ 16V
03:27 PM rue_mohr: as initial or best?
03:27 PM polprog: initial
03:27 PM rue_mohr: nice
03:27 PM polprog: i used 10 resistors.. gonna switch to 1k to be able to run at lower voltages
03:28 PM polprog: interesting, at 1k a totally different waveform
03:28 PM polprog: 20.137k
03:30 PM rue_mohr: I was interested in replacing the lm555 on that voltage booster, but I dont think I can do it anywhere close to the 3 parts it uses
03:30 PM rue_mohr: and none of the other boosters have performed as well as it did
03:33 PM polprog: im yet to play with the 555
03:33 PM polprog: this common emitter amplifier turned out pretty well
03:33 PM polprog: 10x gain
03:34 PM rue_mohr: :)
03:47 PM zhanx: suppose i should lay out the forward kinematics for this bot
03:48 PM polprog: i would do a relay ring oscillator but the relays have their pins too short to stay in the breadboard...
03:54 PM rue_shop2: so put them in sockets
03:54 PM rue_shop2: wire wrap sockets if you have them
03:55 PM polprog: 4n33 is faster
03:55 PM polprog: no sockets here..
03:56 PM polprog: 30khz initial
04:01 PM polprog: cant get the bc547 to amplify that signal
04:03 PM polprog: weird, does with 10k base resistor
04:07 PM rue_shop2: you can just go series siwtching to eh?
04:07 PM rue_shop2: their isolated
04:07 PM rue_shop2: :)
04:08 PM polprog: what?
04:17 PM rue_shop1: resistor, led, and transistor in series, right?
04:18 PM rue_shop1: er, its got to be shunt doens't it?
04:25 PM polprog: no, the transistor is in paralell with the led
04:25 PM polprog: see twitt0r
04:26 PM aandrew: rue_shop1: yes, they're MEMs as far as I can tell, I'm not good at reading chinese :-)
04:27 PM aandrew: rue_shop1: well it's the normal everyday RTV which gives off acetic acid as it cures
04:31 PM zhanx: i think my math is off or 2 dof legs are easy for IK
04:46 PM zhanx: rue_shop1, good call on the adding the servo's to the model, i was 8mm off (too small)
04:49 PM aandrew: I think I need to pick up a bunch of small bearings. that robot joint on twitter is pretty interesting
04:50 PM aandrew: I'm struggling to understand how you have strong grip with metal wire friction-fit against the outside of a bearing though
04:51 PM zhanx: link to that?
04:52 PM polprog: hmm, actually relays can oscillate themselves..
04:53 PM polprog: buzzy
04:58 PM zhanx: and i timed out
04:58 PM zhanx: robot math on size fixed, 200 mm end to end when layed flat for the total length and width
05:05 PM polprog: haha, relay oscillator with rc
05:11 PM polprog: i have no idea how to draw this in an elegant way... never drew relay circuits
05:13 PM rue_mohr: zhanx, ok, there is knowing if the model is off too!
05:14 PM rue_mohr: aandrew, its a complex pulley block system
05:14 PM zhanx: rue_mohr, i measured the model based off the datasheet and its good
05:14 PM rue_mohr: zhanx, link is...
05:14 PM zhanx: https://i.imgur.com/2CXITHU.png
05:15 PM zhanx: don't think i will need the bracing but designed them just in case
05:18 PM aandrew: rue_mohr: yeah, I get the block and tackle reference, and understand how the block and tackle work. it's the fixed pulley part that I'm having trouble wrapping my head around (heh)
05:19 PM rue_mohr: zhanx, https://twitter.com/nixie_guy/status/1253025978873458688
05:19 PM rue_mohr: but..
05:19 PM aandrew: zhanx: link starts here: https://twitter.com/nixie_guy/status/1251910947523960833
05:20 PM aandrew: @nixie_guy's posted a LOT about it in the last few days
05:20 PM rue_mohr: heh, did he change the design after that post I did?
05:21 PM aandrew: rue_mohr: my link is where he first mentions it
05:21 PM aandrew: yours is after he was doing some more work on it
05:21 PM rue_mohr: yea
05:21 PM rue_mohr: thats what I was trying to find
05:22 PM aandrew: is there just so much "grip" between steel cable and bearing due to the cable being wrapped around the bearing?
05:22 PM rue_mohr: I'd thrown him a diagram using two large pullies instead of all the small ones
05:22 PM aandrew: like when you get a fucking power|network|usb cable wrapped around a table leg and you'll break the cable before it slides off?
05:22 PM rue_mohr: nope, its pulling on those ones that they wrap around
05:23 PM aandrew: hm, I'm failing
05:23 PM Tom_L: if you look an an antique radio they used cables wrapped around a pulley like you're describing for the tuners
05:23 PM aandrew: yes they did
05:23 PM aandrew: but they weren't trying to get tons of torque out of them
05:24 PM Tom_L: ships also wrap rope around posts for the same friction effect
05:24 PM aandrew: yes... which is what my cable around table leg was comparing it to, but that's wrong
05:25 PM zhanx: ok model is done?
05:25 PM Tom_L: you were asking about that robot arm drive a while back right?
05:25 PM Tom_L: looks like it turned out pretty cool i think
05:26 PM rue_mohr: <rue_mohr> apr 21 he posts the image that looked like my diagram..
05:26 PM zhanx: 14 files for 13.6kb of code
05:26 PM Tom_L: i think it was you anyway
05:26 PM rue_mohr: haha on apr20 I posted that drawing
05:26 PM rue_mohr: https://twitter.com/RueNahcMohr/status/1252331191920807936/photo/1
05:27 PM rue_mohr: heh, I posted that as a design mod on the 20th, and the 21st he had soemthing looking lots like it :)
05:27 PM rue_mohr: I think I influenced him :)
05:27 PM aandrew: rue_mohr: ok let's use your drawing for this
05:27 PM aandrew: what is the red and blue, just halves of the same cable?
05:28 PM aandrew: or two separate cables
05:28 PM rue_mohr: no
05:28 PM rue_mohr: two calbnles
05:28 PM rue_mohr: they are opposing block and tackle
05:28 PM rue_mohr: the reduction is because of the different sized pullies on the left
05:29 PM rue_mohr: the turn-around poimnt on the right, is pulled buyt eh *difference* in the two cables rates
05:29 PM rue_mohr: which is why he has to have all those bearings
05:29 PM rue_mohr: the cable travels a lot, going around the joint and back
05:30 PM rue_mohr: its complex, took me a while
05:30 PM rue_mohr: wonderfully clever
05:31 PM zhanx: wonder if i should add a radar to this bot
05:33 PM rue_mohr: ok, apolalypse motor driver
05:33 PM rue_mohr: WAKE UP RUE
05:34 PM aandrew: ok so red cable is going around the "vertical" small bearing on the right, and across the top "half" of the big pulley on the right, and one "end" is going around (and fixed to) the small pulley on the left, and the other "end" the same but large pulley on the left?
05:34 PM aandrew: doesn't that put opposing forces on the top half of the right large pulley? or is it two not-connected pulleys (bottom right of your drawing)
05:36 PM aandrew: and wouldn't the red cable have to go 'round the left pulleys in the same direction?
05:36 PM aandrew: no, opposite
05:37 PM aandrew: as you turn the left pulley CW, the smaller pulley would pull and the larger pulley would slack
05:38 PM aandrew: and those two small "vertical" pulleys on the far right are the "load bearing" ends that pull the rectangular shaft upward or downward
05:39 PM rue_shop1: one pulley on th left releases cable
05:39 PM rue_shop1: and one takes up less of it
05:39 PM aandrew: your bottom picture shows the red and blue cables all on the same "side" of both the big and small left pulleys, I think, if I understand correctly, the red cable would show up on the bottom drawing small pulley, but would actually go to the "far" (into page) side of the large pulley
05:39 PM rue_shop1: the delta cable is low
05:39 PM aandrew: this really reminds me of the joints that Johnny Five had in Short Circuit
05:40 PM aandrew: they were cable based as well, I always thought it was so the large motors could hide in more suitable places in the arms
05:40 PM rue_shop1: movie stuff really loves cable stuff
05:40 PM rue_shop1: and after doing those cable based robot arms, i can see why
05:41 PM aandrew: https://twitter.com/nixie_guy/status/1253025978873458688/photo/1
05:41 PM aandrew: you can kind of see how the far end in that pic is two fixed pulleys, but those look like they're the same size
05:41 PM aandrew: the foreground of that pic looks like half of the right side of your pic
05:41 PM rue_shop1: yea
05:42 PM rue_shop1: it looks like the new design be started was based on alterations from my drawing
05:42 PM rue_shop1: :) which I think is cool
05:42 PM rue_shop1: weather I'm right or not :)
05:42 PM aandrew: those two small v-groove bearings in the middle look like an alternative to your pins in the middle
05:43 PM rue_shop1: he went with two
05:43 PM rue_shop1: I'm not sure why, but there are serveral possabilites
05:43 PM aandrew: I think he'd mentioned he just had a lot of small bearings
05:43 PM rue_shop1: ideally, it needs 4 pullies there
05:43 PM rue_shop1: they all go different directions
05:44 PM rue_shop1: my oppinion is to make things smooth and let them rub
05:44 PM rue_shop1: it doesn't neccisarily mean short service life
05:44 PM aandrew: but yes, you "stack" this design to get moar torque at the expense of more turns of the motor
05:44 PM rue_shop1: same reduction on his and mine
05:44 PM rue_shop1: just mine feeds the cables around nice continiously round pullies instead of his discrete ones
05:45 PM rue_shop1: I need to go find a 2nf capacitor, brb
05:45 PM rue_shop1: a chicklet capacitor
05:47 PM rue_shop1: got it
05:48 PM rue_shop1: aandrew, you seeing it?
06:04 PM aandrew: "continuously round pullies" -- isn't that what any pulley is?
06:05 PM aandrew: sorry an old friend called asking if I could clone an android tablet
06:05 PM rue_shop1: he was origionally using discrete pullies made of an array of them
06:05 PM rue_shop1: np, I'm building a motor driver from parts scrounged off circuit boards
06:09 PM aandrew: https://twitter.com/i/status/1252505544537059330
06:09 PM aandrew: so there he doesn't seem to be using the bearings at all
06:09 PM aandrew: the two in the middle I mean
06:10 PM aandrew: oh no I see them now
06:11 PM rue_shop1: you have to guide the cables as the output angle changes
06:12 PM aandrew: the cable on the upper pulley on the right side crosses over in the middle, goes to the left side around the bottom, down through the "vertical" bearing you can't see and around back to the middle, where it hits the lower bearing and into the lower side of the bottom pulley
06:12 PM aandrew: nothing there is "fixed" though -- the cable isn't fixed to either the left or the right side, so it's all just friction doing the moving
06:13 PM aandrew: seven small v-groove pulleys on the effector though, oof
06:14 PM rue_shop1: yea, it should be fixed somewhere
06:14 PM rue_shop1: thats wehre I cahnged it to the two large ones
06:14 PM rue_shop1: and the day after, he did too
06:15 PM aandrew: https://twitter.com/nixie_guy/status/1252493289565163523/photo/1
06:17 PM aandrew: that looks like the cable goes from the right bottom pulley, over the lower middle bearing, around the lower 7-bearing "race", around the vertical bearing, back across the entire upper 7-bearing race (2+14 bearings per effector, wow), over the top vertical bearing, across the top of the lower 7-bearing race, and over the upper middle bearing, and back into the top side of the bottom right pulley
06:18 PM aandrew: the upper pulley now has nothing there
06:18 PM rue_shop1: I'd have to concentrate a while to figure it out without the cables having an attached end
06:19 PM aandrew: yeah, sorry I am struggling with it
06:19 PM aandrew: https://twitter.com/nixie_guy/status/1253025978873458688/photo/1 shows your design (without the 14 bearings) and the middle bearings you can see clearly one is higher than the other (for lower pulley and upper pulley)
06:23 PM rue_shop1: I cant mentally get around not bringing all the cables to a central point, I'm sure a radius changes
06:24 PM aandrew: you're ahead of me :-)
06:25 PM aandrew: https://www.bearingscanada.com/3x12x4-Pulley-V-Groove-Track-Bearing-p/3x12x4-vgroove.htm fancy
06:25 PM aandrew: but pricey
06:26 PM aandrew: https://www.aliexpress.com/item/32951054809.html much nicer
06:26 PM aandrew: USD$0.78/ea
06:27 PM rue_shop1: I also think you can print V pullies and put them on smooth steel pins
06:27 PM rue_shop1: I didn't mention bowden to him yet
06:27 PM rue_shop1: ;)
06:28 PM rue_shop1: the design would is extra great if you can take the cables off to a pack somewhere else
06:29 PM aandrew: I'm trying to figure out how you'd maintain tension
06:29 PM aandrew: you'd have to measure what you needed, spot-weld, and assemble that way I think
06:29 PM rue_shop1: a continious loop is harder to do that with
06:30 PM rue_shop1: my bowden were all less than 360
06:30 PM aandrew: what was your bowden like
06:31 PM Tom_L: pulleys for cables?
06:31 PM rue_shop1: on the robot arm
06:31 PM Tom_L: you don't want V for cable
06:31 PM Tom_L: U instead
06:31 PM rue_shop1: http://ruemohr.org/%7Eircjunk/robots/arm9/slide.htm
06:34 PM aandrew: http://ruemohr.org/~ircjunk/robots/arm9/p1060841.jpg interesting
06:35 PM aandrew: hah dude you drilled a hole through the center of a screw? awesome
06:37 PM aandrew: aha
06:37 PM aandrew: 603UU is a thing
06:37 PM aandrew: https://www.aliexpress.com/item/32919351672.html
06:41 PM aandrew: heh why are flange bearings cheaper than flat
06:42 PM Tom_L: uber cheap quality?
06:42 PM aandrew: I would expect flat to be available equally shitty
06:45 PM Tom_L: vxb is usually cheap
06:45 PM aandrew: ah, 3x10x3 seems to be popular for fishing
06:55 PM aandrew: also v groove is cheaper than u groove in same size
07:17 PM aandrew: I think I'm ok with cheap bearings
07:18 PM aandrew: I don't know any better yet so get the cheap shit and learn what the limits are and how they tend to break
07:21 PM aandrew: so
07:21 PM aandrew: I got my thread registration / thread stack monitor / thread watchdog stuff done last night
07:21 PM aandrew: today I got the optical tracking module properly working after undoing all the shit work they did to build up a prototype
07:21 PM aandrew: today I don't have anything pressing
07:21 PM aandrew: so I'm gonna lurk on ali and maybe go to bed early
07:22 PM aandrew: dream of projects I want to do
07:23 PM aandrew: https://www.aliexpress.com/snapshot/0.html forgot I bought that
07:24 PM aandrew: https://www.aliexpress.com/item/32848934182.html bought a BUNCH of those -- 25% of them were garbage (squashed so they were elliptical)
07:24 PM aandrew: but that's still decent, 75 usable ones for that price
07:27 PM aandrew: lol. store name: "China's foreign trade than gorgeous technology export co., LTD"
07:29 PM rue_shop1: that bead thing did NOT work
07:31 PM rue_shop1: have you seen the "intel hand" ?
07:31 PM rue_shop1: thats where I got the bead idea
07:33 PM rue_shop1: there isn't much about it
07:34 PM aandrew: no, haven't heard of intel hand
07:34 PM rue_shop1: data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAkGBxISEhUSEhIVFRUVFxUYFRcVFRUVGBcYFxUXFxcVFhUYHSggGBolHhcWITEhJSkrLi4wGB8zODMtNygtLysBCgoKDg0OGxAQGi0lHyUtLS0tLS0tLS0tLS0tLS0tLS0tLy0tLS8tLS0tLS0tLS0tLS0tLTUtLS0tLS0tLS0tLf/AABEIALgBEwMBIgACEQEDEQH/xAAcAAAABwEBAAAAAAAAAAAAAAAAAQIDBAUGBwj/xABBEAACAQIEAwYEAgkDAwQDAAABAhEAAwQSITEFQVEGEyJhcYEykaGxQlIHFCNigsHR4fAzkvFDU7IVNHKiFhck/8QAGQEBAQEBAQEAAAAAAAAAAAAAAAECAwQF/8QAJBEBAQACAgMA
07:34 PM rue_shop1: AQQDAAAAAAAAAAECEQMhEjFBUQQTImFxofD/2gAMAwEAAhEDEQA/AOX1d9m+z7YlszStoHU82/dX+tO9mezjYgi5clbQ9i/kvl1P+DoliyFAVQAoEADQAV9Hn/UeP8cfbx8PDvvL0LDYdUUIgCqogAU+ooKKcAr51r2gopYFAClgVAAKWBQApYFBmO1mES9lR1Phkq2xEiDHWsXj+zzADJBjmpKuR56wa6xesKwhgDVXi+Bg6oY8jqPnQcbxC3UbKYYnYOuU+zCPrTQxqjR1ZD/uHz3roHHOFuB+0tyo5xI+fKqTBdlzcQtK2rOvieWmNxbtiWc+ggcyKooLV5W2IPodfkdaXIqdiOEYIRlTE3SG1I7uyhHkpzMPWfYUxicNh/Fke9ZYkFEuAXbYGsgt8XSDFQMxTxwdzLnyPk/NlOXlz25j5il
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07:35 PM aandrew: I don't think you meant to do that
07:35 PM rue_shop1: KVnUba/KtzxK0+IsZbSTdt5nBEybcEunSBq23NqqET9asrbuZla1E5RmPMSRMwQTrVl2ligCm2udW5fCdRqI296XhBiLWtt9DuAx19Rsfel3sBcW4tiJLEBPiGbXTwkT9KU8rIDTGg0Ik9B19dqodt8dI0vWhPVfAfl8P0qUcbbOzx0DCPqJFUWIuu41J9Ki2bbE6DNr8Opn2oNLikux+zu2wNNg7H3IUx9Kq7ty+pgXWY+XeDXp41FQWLqcpDIehkffWrThTX8xEs6qC5XNpA0nXeJH0oaRWt4th4u8jnLECPPWpvZnhWHv6PijZuTAU2nKEde9tklT/AAe9SrvEhnVfEkiZy7E/DI5rvqKnXrl4ozGyt5oIzquZl8yYzfORQTuJcDfD91cuBbtiQC2YXEYTBi+p8LkahWM6bVr8N2ewJtk20V
07:35 PM rue_shop1: ... did it stop?
07:36 PM rue_shop1: http://download.intel.com/pressroom/images/robothand_seattle.jpg
07:36 PM rue_shop1: from what I can tell, its some kinda high end bike brake cable
07:36 PM rue_shop1: yea, inline base64 image, THANKS GOOGLE
07:37 PM rue_shop1: the origional posting tied it to intel
07:39 PM zhanx: oof that link
07:39 PM rue_shop1: inline base64
07:39 PM rue_shop1: 'copy link location'
07:39 PM zhanx: hate it when that happens
07:40 PM rue_shop1: google seems to be going to lengths to make it hard to do
07:41 PM aandrew: I've never seen that before, weird
07:41 PM aandrew: I could see bike cable for that kind of appliation
07:41 PM aandrew: application
07:43 PM zhanx: i used bike cable as a hand throttle before, its got many uses
07:47 PM rue_shop1: see the tensioners?
07:47 PM rue_shop1: change the circuit length
08:05 PM aandrew: wtf https://www.aliexpress.com/item/32989841042.html
08:07 PM rue_mohr: I hear china sells to the US military a lot
08:08 PM rue_mohr: which is apparently the reason they relabel chips
08:10 PM zhanx: china can't sell direct to the military its a weird rule etc
08:13 PM zhanx: man can't maths tonight
08:16 PM rue_shop1: IK?
08:16 PM rue_shop1: FK?
08:16 PM rue_shop1: oh, the blob on that hand:
08:16 PM rue_shop1: Intel researchers are taking tips from nature to create increasingly more sensitive robot hands. The technology, called Electric Field Pretouch
08:17 PM rue_shop1: https://www.intel.com/pressroom/innovation/archive.htm
08:22 PM zhanx: IK
08:22 PM zhanx: you know i just do the FK to make sure the bot is right and do the IK so it works right
08:23 PM rue_shop1: you have that elbow function I wrote?>
08:31 PM zhanx: no, that pc died
09:03 PM rue_shop1: k
09:03 PM rue_shop1: would it help?
09:04 PM zhanx: http://emanual.robotis.com/docs/en/platform/thormang3/introduction/ body for you
09:04 PM zhanx: sure why not
09:11 PM zhanx: rue_shop1, can you order me 32 of these? http://en.robotis.com/shop_en/item.php?it_id=902-0157-000
09:14 PM rue_shop1: huh, I'd changed a PN2222 for a C1213, which looks like it should be fine, but wasn't
09:15 PM rue_shop1: you remamber you give it the length using two segments and it tells you what angle to set them to
09:15 PM rue_shop1: ?
09:15 PM zhanx: yep i remember that
09:16 PM rue_shop1: dynamixel is pretty expensive
09:16 PM zhanx: very expensive
09:16 PM rue_shop1: I wouldn't
09:16 PM rue_shop1: https://github.com/ruenahcmohr?tab=repositories
09:16 PM rue_shop1: I wonder...
09:16 PM rue_shop1: no...
09:17 PM rue_shop1: http://ruemohr.org/%7Eircjunk/programming/c/ik/
09:18 PM zhanx: yep that was it
09:46 PM aandrew: interesting, what's that code for? looks like some kind of calculator for robotics
09:46 PM zhanx: yea its for the leg movements
09:46 PM zhanx: to minimize pressure on the motors for movement etc
09:48 PM aandrew: interesting
10:04 PM rue_shop1: so, it was latching up, had to change my driver circuit for the voltage booster
10:06 PM rue_shop1: the 24V booster works, I'm gonna call it a night on that
10:06 PM rue_shop1: that TEK scope puts out about 400w thru a fan off the side and I'm cooked
10:12 PM zhanx: rue_shop1, school me
10:13 PM rue_mohr: hmm drawings
10:13 PM zhanx: using an electron magnetic as
10:13 PM zhanx: electro
10:13 PM rue_mohr: so, you have to know two angles
10:13 PM zhanx: a servo/clutch
10:13 PM rue_mohr: oh
10:13 PM zhanx: yea plot twist on that one
10:13 PM zhanx: pancake motor style
10:14 PM rue_mohr: ha! my germanium diodes came in
10:14 PM zhanx: nice
10:14 PM rue_mohr: leads are a bit tarnished :/
10:15 PM rue_mohr: and two fans...
10:15 PM rue_mohr: k..
10:15 PM rue_mohr: so, you want to make a clutch?
10:15 PM rue_mohr: like on a car AC compressor?
10:15 PM zhanx: i want a turrent that can spin on the top of the bot
10:16 PM zhanx: i was thinking of controlling speed with a clutch as whatever why not thing
10:16 PM rue_mohr: ah you want power, like is conducted thru brushes, but you want signal, like is conducted via a VCR head
10:16 PM rue_mohr: ah, why not just varry the motor speed?
10:17 PM zhanx: top one
10:17 PM zhanx: and to learn
10:17 PM rue_mohr: tahts odd
10:17 PM rue_mohr: oh, no its not
10:18 PM rue_mohr: I ordered the fans a month ago
10:18 PM rue_mohr: thught it was yesterday
10:18 PM zhanx: gonna use this mini bot as a test bed for a while
10:19 PM zhanx: so... options and ideas etc
10:19 PM rue_mohr: ... like a car AC compressor clutch?
10:20 PM zhanx: maybe not sure yet
10:23 PM rue_mohr: huh, I need a tiny adjustable bench supply for the bedroom
10:23 PM rue_mohr: like, 0-60V 0-20A
10:23 PM rue_mohr: maybe smaller might do...
10:24 PM zhanx: 60v 20a in the bed room.....
10:25 PM rue_mohr: maybe a dual floating output
10:26 PM rue_mohr: I...... dont really know why I bought these fans...
10:29 PM rue_mohr: well, firefox crashed, I should try my new kernel