#robotics Logs
Dec 30 2018
#robotics Calendar
12:12 AM flav0r: WAKE UP PEOPLE !
12:15 AM mrdata||: ok
12:15 AM mrdata||: whats going on
12:15 AM mrdata||: flav0r, ^
12:28 AM rue_shop1: flav0r,
12:29 AM rue_shop1: http://ruemohr.org/%7Eircjunk/oldsite/vfd.htm
12:29 AM rue_shop1: flav0r, ok?
12:30 AM zhanx_: ok based off the wife's demand ordering steppers
12:31 AM rue_shop1: what price you see them for?
12:32 AM rue_shop1: I'm pretty sure there is a temp where ldpe pools
12:32 AM rue_shop1: er hdpe
12:33 AM zhanx_: https://www.ebay.com/i/332837685563?chn=ps&var=541960495744
12:34 AM rue_shop1: whaaa 10 motors for $12???
12:34 AM zhanx_: wait till i get them but yes
12:35 AM rue_shop1: no, I'm good
12:35 AM zhanx_: i had too
12:35 AM rue_shop1: I was looking for a 400ppr motor for that 3d scanner and found about 20 steppers good for 3d printers
12:35 AM rue_shop1: had to stop putting them aside
12:35 AM rue_shop1: the problem now is that the upper milk-crate had disintegrated and now I have a crate of steppers on the floor
12:36 AM rue_shop1: its a good thing the crate under it was full
12:36 AM zhanx_: rue_shop1, if they come in at 10 for that price i am getting 4 more lots
12:36 AM rue_shop1: yea
12:36 AM rue_shop1: not available to me anyhow, it'd be $400 shipping
12:37 AM rue_shop1: 2A is pretty brutal tho
12:37 AM zhanx_: or me and gas poppin over the border
12:38 AM rue_shop1: https://www.omc-stepperonline.com/nema-17-bipolar-59ncm-84ozin-2a-42x48mm-4wires-w-1m-cable-and-connector-17hs19-2004s1.html
12:38 AM flav0r: heheh
12:38 AM flav0r: i was afk
12:39 AM flav0r: hmm i think you showed me that before too
12:39 AM rue_shop1: wouldn't it be funny if they *just* ramped up stepper production right as china gets cut off from north america
12:39 AM flav0r: i think maybe i mentioned VFD before
12:39 AM flav0r: now its time for me to actually do it !
12:39 AM rue_shop1: flav0r, well go for it
12:39 AM flav0r: yeah man !
12:39 AM rue_shop1: see if you can power the filament, thats a good start
12:39 AM flav0r: im on it !
12:39 AM flav0r: yah
12:39 AM rue_shop1: forgot everything else
12:39 AM rue_shop1: and the filament has to be AC
12:39 AM flav0r: need about 1.5v for that
12:39 AM rue_shop1: sine or square wave, dosnt' matter
12:39 AM flav0r: hmm i thought can be dc
12:40 AM rue_shop1: can be a transfomer on a 555 at 50%
12:40 AM rue_shop1: has to be AC tho
12:40 AM rue_shop1: or it doesn't balance the intensity
12:40 AM flav0r: ahhh
12:40 AM flav0r: so PWM is ok ?
12:41 AM flav0r: ill do some more reading !
12:41 AM zhanx_: rue if that ebay works out i am ordering a ton more
12:41 AM zhanx_: my arm will love them
12:45 AM rue_shop1: flav0r, it has to alternate polarity, so, an H bridge would be ok
12:45 AM flav0r: ahhh
12:45 AM flav0r: yah i gotta look into it
12:45 AM rue_shop1: F/R 50% duty (always on tho)
12:45 AM rue_shop1: from 120Hz up
12:45 AM rue_shop1: (well 60 up)
12:45 AM rue_shop1: ok, mulling wax into hdpe isn't the walk in the park I thought it'd be
12:45 AM flav0r: hmm when you say balance intensity
12:45 AM rue_shop1: if you use dc, the digits on one side are brighter
12:46 AM rue_shop1: by a lot
12:46 AM flav0r: is that where people mention the brightness varies across their tubes
12:46 AM flav0r: yah
12:46 AM flav0r: i think they were using dc
12:46 AM flav0r: how would that affect multiple tubes tho
12:46 AM rue_shop1: if you have a failing inverter for systems that work on dc, you can get harmonics that cause strange stripes on the display horizontally
12:46 AM flav0r: likei in a VCR display theres multiple digits etc
12:47 AM flav0r: witht he filaments spanning them all
12:47 AM flav0r: but what about individual tubes
12:47 AM rue_shop1: they use a dedicated filament off the pwoer transformer
12:47 AM rue_shop1: do you have any small AC transforemrs?
12:47 AM rue_shop1: 6cvt from an alarm clock or soemthing?
12:47 AM flav0r: yah ive got some floating around
12:48 AM flav0r: i think they are maybe 12v or something
12:48 AM flav0r: id have to have a look
12:48 AM rue_shop1: I dont know if you could use a 8/1000R audio transformer and a 555
12:48 AM flav0r: not something ive ever used before you see !
12:49 AM rue_shop1: (the 555 has a nice totem pole driver that, in series with a capacitor, could pushpull drive an audio transformer
12:49 AM rue_shop1: ok I think 160c is too hot for the wax
12:51 AM flav0r: http://rutubes.com/published/SC/html/scripts/watermark.php?type=big&photoID=1370
12:51 AM flav0r: im using this type of tube
12:51 AM flav0r: fromt he reading ive done people just straight up use DC
12:51 AM flav0r: but yeah i should expermint with some AC and DC i think
12:51 AM rue_shop1: hu?
12:51 AM rue_shop1: uh
12:51 AM flav0r: um
12:51 AM flav0r: er
12:52 AM flav0r: my spelling rocks too
12:52 AM rue_shop1: what is that from!?
12:52 AM flav0r: EXPERMINT !
12:52 AM flav0r: i assume clocks and military equipment from back int he day
12:52 AM flav0r: those are soviet tubes
12:52 AM rue_shop1: I think you need ac on the filament
12:53 AM zhanx_: rue_shop1, want to make this better https://www.instructables.com/id/Build-your-own-3d-printing-filament-factory-Filame/
12:53 AM rue_shop1: if you didn't... there would be.... another anode.... maybe I think....
12:53 AM flav0r: ill fuck around with it :)
12:53 AM zhanx_: for wax
12:53 AM rue_shop1: zhanx_, I have a filastruder parts bin
12:53 AM zhanx_: pics?
12:53 AM rue_shop1: I just emailed armyofevilrobots about working on it
12:53 AM rue_shop1: its got an augger that fits in a 3/4" pipe, with a flange, a thermocouple and temp controller
12:54 AM zhanx_: rue_shop1, i am over here reinventing the wheel on wax
12:54 AM rue_shop1: god that looks like such a cludge
12:54 AM rue_shop1: why is there a cooling fan on the wiper motor!?
12:55 AM zhanx_: its a crap build we can do better
12:56 AM rue_shop1: duh :)
12:56 AM zhanx_: consider it a base we didn't make
12:56 AM rue_shop1: actaully, we cant, our standards are too high to ever finish one becasue we couldn't accept the design that would work but wasn't perfect
12:56 AM rue_shop1: :)
12:56 AM zhanx_: yours not mine
12:56 AM rue_shop1: I been working on it!
12:57 AM zhanx_: ok that small printer will be this
12:57 AM zhanx_: i need 150x150x whatever z
12:58 AM rue_shop1: I meant like 40x40mm with a resolution of like 0.25thou and a nozzel of like 1 thou
12:58 AM zhanx_: i get that with the printer right now
12:59 AM zhanx_: its printing at .15 right now
01:07 AM rue_shop1: https://www.ebay.com/itm/1Pcs-110V-380W-Injected-Mould-Heating-Element-Band-Heater-35x35mm-Stainless-NEW/292778200525?epid=8013083989&hash=item442af0cdcd:g:1egAAOSwlypbyYNd:rk:5:pf:0
01:07 AM rue_shop1: might be too big
01:07 AM rue_shop1: 11pm, hmmm
01:09 AM rue_shop1: I'm not sure if the wax is mixing with the PE or not
01:13 AM rue_shop1: I know where I'v seen this before
01:13 AM rue_shop1: marshmellows and butter
01:15 AM rue_shop1: 8-o
01:16 AM rue_shop1: it must be working, I can pretty easy push my claws thru the sample I pulled off a stick
01:16 AM rue_shop1: nails...
01:16 AM rue_shop1: right yea
01:16 AM rue_shop1: }:) hey, I have a half-made manual plastic injection ram....
01:17 AM rue_shop1: but this stuff wouldn't just melt out of a mold
01:17 AM rue_shop1: hmm
05:07 AM flav0r: https://imgur.com/a/8EAfd7Y
05:07 AM flav0r: finally got to this
05:07 AM flav0r: had some other work to do first !
05:08 AM flav0r: anyway it allegedly wants between 1 and 1.3 V
05:08 AM flav0r: so i gave it 1.2
05:08 AM flav0r: the sheet says nominal current is 100mA
05:08 AM flav0r: its drawing 80mA with no additional resistor (about 6 ohm by itself)
05:09 AM flav0r: seems ok
05:09 AM flav0r: 2nd pic … just gave it a bit of extra juice ! :)
05:09 AM flav0r: DC by the way
05:09 AM flav0r: now time to make it show something useful
06:22 AM Tom_L: i think zhanx_ read that stepper ad wrong, they're 12 ea
06:22 AM Tom_L: 10 for 80
06:29 AM rue_mohr: that would make more sense
06:29 AM Tom_L: upper left is the ammount selector
06:29 AM Tom_L: quantity
06:33 AM rue_mohr: seemed too low to be right
12:58 PM SpeedEvil is now known as Guest54047
05:04 PM Tom_itx is now known as Tom_L
05:10 PM rue_shop1: hammered out a few bugs with the digital force feedback controller
05:10 PM rue_shop1: :D one was a macro error
05:12 PM rue_shop1: there are two problems to work on
05:12 PM rue_shop1: one is that there is an oscillation in my constant current driver
05:13 PM rue_shop1: the other is that the motors aren't really big enough to fight a human off
05:13 PM rue_shop1: so, if I get some of that worked out, and then I can work on splitting it to work over a serial connection
05:14 PM rue_shop1: iirc, I worked out to have them both do the same calculation on each end so its symmetric
05:28 PM rue_shop1: ok 0.68uF across the motor killed the ring
05:29 PM Tom_L: just like a sponge
05:36 PM rue_shop1: the datasheet implies that the tda2050 has ring issues
05:37 PM rue_shop1: so, that gives me a few directions I can go
06:48 PM * rue_shop1 plays in the gear box
08:09 PM flav0r: HEY HEY !
08:23 PM rue_shop3: how dd you make out with the display?
08:36 PM flav0r: hold on
08:36 PM flav0r: ill show yoooou
08:37 PM flav0r: https://imgur.com/a/rYS39N0
08:39 PM rue_shop3: cool!
08:39 PM rue_shop3: did you hard wire the 9 or via microcontroller?
08:40 PM flav0r: just hardwired it
08:40 PM flav0r: jsut testing it out
08:40 PM rue_shop3: ok
08:40 PM rue_shop3: do you have a uln2003?
08:40 PM rue_shop3: the brightness looks even, did it need ac?
08:42 PM flav0r: all DC
08:42 PM rue_shop3: oh cool
08:42 PM rue_shop3: 25V?
08:42 PM flav0r: yah i figured i should try DC first
08:42 PM flav0r: well the pic is something like 6V
08:42 PM flav0r: coz too bright for photo
08:42 PM rue_shop3: no I mean on the electrodes
08:42 PM flav0r: but yeah the sheet says upwards of 30V
08:42 PM flav0r: yah man
08:43 PM rue_shop3: oh, cool
08:43 PM flav0r: 6v in the picture :)
08:43 PM flav0r: 1.2v on filament
08:43 PM rue_shop3: wow, so, got a uln2003?
08:43 PM flav0r: looks nice at25v to the naked eye
08:43 PM flav0r: nooooo
08:43 PM flav0r: i have HV518P-G
08:43 PM flav0r: for testign on breadboard
08:43 PM flav0r: HV518P
08:43 PM rue_shop3: !? ok
08:44 PM flav0r: yah its a package designed to drive that kinda stuff
08:44 PM rue_shop3: the uln2003 was too
08:44 PM rue_shop3: but whatever
08:44 PM flav0r: with shift register built in
08:44 PM flav0r: yah i know man
08:44 PM flav0r: just sayign what i have !
08:44 PM flav0r: lol
08:45 PM flav0r: then i have in PLCC for when i actually make something
08:46 PM rue_shop3: fancy
08:46 PM flav0r: lol yeah
08:46 PM rue_shop3: you gonna send off a board?
08:46 PM flav0r: yeah
08:46 PM flav0r: just making yet ANOTHER clock
08:46 PM flav0r: hahah
08:46 PM rue_shop3: send, some to me, I'll help with the bodgewires
08:47 PM flav0r: i also have some 16 segment variety tubes
08:47 PM flav0r: so ill make a more elaborate kinda display thingy with it
08:47 PM rue_shop3: have a sheet with a suggested font?
08:47 PM flav0r: https://tubes-store.com/images/iv4_01_xl.jpg
08:48 PM flav0r: the other tubes look like that
08:48 PM flav0r: nope .. no sheet regarding a desired font
08:49 PM rue_shop3: hmm, printing this wont work
08:49 PM rue_shop3: ah, I could turn some plastic on the lathe...
08:52 PM flav0r: just as a side note i opted for those other chips because i dont want to multiplex
08:53 PM flav0r: and so didnt want to have a LOT of chips to achive the result
08:53 PM flav0r: otherwise yeah a couple of those other ones and multiplexing is somewhat cheaper overall
09:04 PM flav0r: what you up to dude ?
09:09 PM rue_shop3: new force feedback servos
09:09 PM rue_shop3: cause, the ones I made are a bit to weak to give a good demo
09:11 PM rue_shop3: found two matching gear trains
09:11 PM rue_shop3: got the pinions on the matched motors
09:11 PM rue_shop3: used the cnc to mill the cams off the gears
09:12 PM rue_shop3: and just used the lathe to make adapters so the gears fit the potentiometers
09:12 PM rue_shop3: SO
09:13 PM rue_shop3: ratio is 14:
09:14 PM rue_shop3: 69
09:15 PM rue_shop3: 14:69
09:15 PM rue_shop3: so about 5:1
09:20 PM rue_shop1: 69
09:20 PM rue_shop3: the old ratio was 12:80
09:20 PM rue_shop3: 6.66
09:20 PM rue_shop3: 6.66:1
09:20 PM rue_shop3: hmm
09:21 PM rue_shop3: much larger motor, wonder if I'll be ok
09:29 PM flav0r: good one dude !
09:34 PM rue_shop3: hmm
09:34 PM rue_shop3: maybe I'll just cnc up the parts
09:36 PM rue_shop3: oh hey yea, got some 1/8" lexan
09:36 PM rue_shop3: that'll do
09:37 PM flav0r: fuck yeah dude !
09:37 PM flav0r: MAKE IT SO !
09:38 PM * rue_shop3 checks the % on the bottle beside flav0r
09:38 PM rue_shop3: 13%?
09:38 PM rue_shop3: how much did you drink?
09:38 PM flav0r: dude i think alcohol is a form of control from the powers that be
09:38 PM flav0r: thus stopped consuming :)
10:11 PM Atomsk is now known as ace4016
10:25 PM rue_shop3: drat, no 3d printed parts on this project yet
10:40 PM justan0theruser is now known as justanotheruser
10:40 PM zhanx_ is now known as zhanx
10:41 PM rue_shop3: hey
10:41 PM rue_shop3: well, the 3d scanner isn't finished yet
10:41 PM rue_shop3: but my digital force feedback system is doing great
10:42 PM rue_shop3: just upgrading the motors and then I can move on to splitting it up over a serial connnection
10:44 PM rue_shop3: Tom_L, did you do a gcode file for that mold?
10:56 PM rue_shop3: the super thing is that the force feedback system can use any actuators that are force controled and provide position feedback
11:53 PM rue_shop1: zhanx, ?
11:53 PM zhanx: ?
11:56 PM rue_shop1: what cha workin on then
11:56 PM rue_shop1: I'm just hooking up my new force servos
11:57 PM zhanx: the 2d pen wall plotter