#robotics Logs
Dec 03 2017
#robotics Calendar
12:03 AM rue_mohr: Tom_L, I'd suggest moving forward and keeping notes for a next, better machine
12:06 AM rue_mohr: if you start going backwards, you will never finish
12:06 AM rue_mohr: as you know, my design is based on making a reaaaaly sturdy, ridgid C and then attaching a bunch of carefully positioned axies on it
12:06 AM rue_mohr: [
12:06 AM rue_mohr: G almost
12:10 AM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Column_Mill_Design.jpg
12:11 AM Tom_L: maybe something like this
12:11 AM Tom_L: it would be stronger
12:11 AM Tom_L: that's the nice thing about cad
12:11 AM rue_mohr: of course it would be
12:11 AM rue_mohr: stronger yet, if you took another peice of that tube and used it for the bottom
12:12 AM Tom_L: i'll have to see what is available at the scrap yard
12:12 AM Tom_L: the big stuff is harder to find
12:12 AM Tom_L: especially short pieces
12:13 AM Tom_L: and scrap steel is relatively cheap
12:14 AM Tom_L: i can modify the Z extension over the table, i just wanted to get an idea
12:14 AM Tom_L: that's how most VMC mills are made
12:16 AM Tom_L: that's 6" tube
12:17 AM Tom_L: some time back i got a piece of 4-5" round tube i could use but i think it would be more trouble working with round
12:18 AM Tom_L: i spliced a broken basketball goal post with it
12:19 AM Tom_L: i'll have all the pieces next week. changing the metal parts is the cheap part
12:25 AM mrdata: what are typical bed sizes for hobby 3D printers?
12:32 AM rue_mohr: 20cm
12:32 AM rue_mohr: origionally, the commercial ones are starting to get smaller
12:32 AM rue_mohr: to save money
12:38 AM mrdata: ugh; i need the whole 20cm
12:40 AM mrdata: (preferably); and if it's less than 146 mm then i have a problem
12:41 AM rue_mohr: you cant print anything that big anyhow
12:41 AM rue_mohr: shrinkage
12:41 AM rue_mohr: huge prints peel off the table as they curl
12:41 AM rue_mohr: think about 1% over 146mm
12:43 AM mrdata: well, it's a box
12:44 AM mrdata: so it would be just the walls
12:44 AM mrdata: but maybe there are smart ways to print that even if there's shrinkage
12:45 AM rue_mohr: why the hell would you print a box like that big
12:46 AM mrdata: why not
12:46 AM rue_mohr: well, you could always use a key instead of a screwdriver too
12:46 AM rue_mohr: you could use your toothbrush as a hammer
12:46 AM rue_mohr: WHY NOT
12:47 AM * rue_mohr passes mrdata a nail and a toothbrush
12:47 AM rue_mohr: giddyup, we aint got all century
12:47 AM * mrdata fashions the nail into a spoon and starts scooping ice cream with it
12:48 AM mrdata: see, i'm really not all that familiar wirth 3D printing issues
12:48 AM Tom_L: rue_mohr, which design is most preferred do you think?
12:48 AM rue_mohr: huge ass L or C with stuff attached to it
12:49 AM rue_mohr: mrdata, get a 3d printer and start learning
12:49 AM Tom_L: tube is stronger though
12:49 AM rue_mohr: pay $4000, cause building one for $100 takes tooo long
12:49 AM mrdata: rue_mohr, but i'm busy so i passed this task onto a cohort to do
12:49 AM mrdata: and havent heard back, yet
12:50 AM mrdata: maybe he's having trouble? i guess i'm finding out from you because he's embarassed
12:50 AM rue_mohr: you cant hammer a nail into a board, with a toothbrush, in 1 day
12:52 AM mrdata: but can you fashion a cone to go from 100 mm diameter to 146 mm, with a 3D printer?
12:52 AM Tom_L: sure
12:52 AM rue_mohr: toothbrush, nail, board
12:52 AM Tom_L: how tall?
12:53 AM mrdata: as short as parameters allow
12:53 AM Tom_L: that's not a valid answer
12:53 AM rue_mohr: in less than 10mins you can cut a peice of sheet metal into that shape and afix it togethor using any of 500 means
12:54 AM mrdata: if it changes by 1 mm dia for every 2 mm height, i think i'm okay
12:54 AM Tom_L: that's 45 deg
12:54 AM mrdata: no it isnt
12:54 AM Tom_L: 23.5
12:54 AM Tom_L: overall it's 45 deg
12:55 AM Tom_L: 22.5 sry
12:55 AM mrdata: 1 mm dia = 0.5 mm radius; 2 mm height
12:55 AM mrdata: means slope is 2 / 0.5 = 4
12:56 AM Tom_L: what initial diameter do you need?
12:56 AM mrdata: if it sytarts as the largwer diameter and gets smaller, is that better? if so, 146 mm
12:57 AM Tom_L: how tall?
12:57 AM mrdata: i guess that works out to 92 mm
12:57 AM rue_mohr: Tom_L, can you do a flattened sheetmetal template for it?
12:57 AM Tom_L: yes
12:58 AM Tom_L: but i'm not going to
12:58 AM rue_mohr: oh, I'd love to see that
12:58 AM Tom_L: catia does that quite nicely
12:58 AM rue_mohr: and taunt mrdata with making one in like 10 mins
12:58 AM Tom_L: but you don't need it
12:58 AM Tom_L: just lay it out flat
12:58 AM rue_mohr: and showing him pics, of it sitting in my shop here in canada
12:58 AM rue_mohr: where he cant get it
12:58 AM Tom_L: 2 arcs
12:58 AM Tom_L: the diameter distances
12:59 AM Tom_L: and the height apart
12:59 AM * rue_mohr looks mrdata in the eyes
12:59 AM rue_mohr: :P
12:59 AM rue_mohr: *sigh*
12:59 AM Tom_L: i'm quitting for today
12:59 AM Tom_L: will start again today
12:59 AM rue_mohr: its not today
12:59 AM rue_mohr: its tonight
12:59 AM Tom_L: ^^
01:00 AM Tom_L: 1:00am
01:00 AM rue_mohr: fine, then its tomorning
01:00 AM rue_mohr: have it your way
01:00 AM Tom_L: i was just looking over some commercial mill designs playing with cad a bit
01:01 AM rue_mohr: try not to go backwards, its dangerous to finishing a project
01:01 AM Tom_L: the original idea came from materials i had
01:01 AM rue_mohr: DONT LOOK BACK
01:01 AM rue_mohr: indeed
01:01 AM Tom_L: now i know what to hunt for
01:01 AM Tom_L: before i really didn't know what to hunt for
01:01 AM rue_mohr: I'v learned that if I dont keep my direction forwards and sideways on a project, I end up with something else that takes up space in the shop
01:02 AM rue_mohr: you need to be wrong to know what right is
01:02 AM rue_mohr: or know somone elses wrong
01:02 AM Tom_L: i know i have limited space to put it
01:02 AM rue_mohr: mmhm
01:02 AM rue_mohr: I still cant understand this damn circuit
01:02 AM * mrdata sighs; the stiffness of the sheet metal would have to be considered
01:02 AM rue_mohr: http://ruemohr.org/~ircjunk/tutorials/elex/ldvc/positiondetector.png
01:02 AM Tom_L: but i still want it to be sturdy
01:03 AM rue_mohr: it seems to kinda use a switching capacitor like thing
01:03 AM Tom_L: what is it?
01:03 AM rue_mohr: C4 and C5 kinda build up voltages
01:03 AM rue_mohr: its a position sensor
01:03 AM Tom_L: oh
01:03 AM rue_mohr: a really fast, accurate and cheap one
01:04 AM mrdata: anyway, slope of 4 is 75.96 degrees; is a typical 3D printer able to overhang that much?\
01:04 AM rue_mohr: C4 and C5 are a differential cap
01:04 AM rue_mohr: mrdata, download slic3r, turn on the advanced settings
01:04 AM rue_mohr: look at the setting that limits build out
01:04 AM Tom_L: mrdata, i printed a whole gap before with no issues
01:04 AM rue_mohr: its your first step to a new printer
01:06 AM Tom_L: https://grabcad.com/library/hard-drive-adapter-1
01:06 AM Tom_L: i printed that on end just fine
01:06 AM Tom_L: it filled the gap nice
01:06 AM rue_mohr: huh 404
01:06 AM Tom_L: wonder if you have to log into grabcad first
01:07 AM mrdata: the file opens for me
01:08 AM mrdata: Tom_L, that's cute, how big is it?
01:08 AM Tom_L: it's a 2.5 hdd adapter
01:08 AM Tom_L: i got 2 or 3 of em here
01:08 AM mrdata: that doesnt answer the question tho bc idk how big those are
01:09 AM mrdata: 2.5 inch?
01:09 AM Tom_L: yes
01:09 AM Tom_L: the center mount is
01:09 AM mrdata: ok
01:09 AM Tom_L: the outer one fits a regular hdd space
01:09 AM mrdata: wonderful
01:09 AM Tom_L: gnite
01:09 AM mrdata: nn
06:31 AM anonnumberanon: this is all that's required for a simple neat small screen demo on avr https://github.com/kmm/SS1306/blob/master/SSD1306demo/SSD1306demo.c
06:31 AM anonnumberanon: gonna have to try it
06:31 AM anonnumberanon: i hope it comes with lines and circles, semi circles
08:57 AM durrf: whoo im building a simple arduino-powered quadruped
08:58 AM SpeedEvil: the only simple quadruped design. https://www.youtube.com/watch?v=syUfxj4OYi8
08:59 AM SpeedEvil: Though video is biped
09:16 AM anonnumberanon: man this guy really struggled https://www.youtube.com/watch?v=RS0wiUBN26U
09:17 AM anonnumberanon: cool durrf pictures?
09:28 AM durrf: none yet, not my design but its this one, i have plans on stuff to add https://www.thingiverse.com/thing:1009659
09:29 AM anonnumberanon: hah awesome, you got a 3d printer yet?
09:29 AM durrf: yeah, i have two plates left and its ready to assemble
09:30 AM durrf: i didnt plan my prints out very well and now im stuck with parts that need other parts to do anything with
09:30 AM durrf: im just impatient
09:30 AM durrf: :P
09:30 AM anonnumberanon: you've come to the right place :)
09:33 AM durrf: now i gotta research how easy it would be to interface my arduino to a turnigy RC receiver
09:34 AM durrf: wow its gonna be easy peasy it looks
09:34 AM anonnumberanon: https://www.youtube.com/watch?v=bENjl1KQbvo&list=PL0K4VDicBzsibZqfa42DVxC8CGCMB7G2G&index=3
09:34 AM anonnumberanon: this shoudl be a good guide for that ^^
09:34 AM durrf: thanks
09:36 AM anonnumberanon: yeah you connect your arduino to the receiver and do "pin change interrupts" on the pins that are connected
09:37 AM anonnumberanon: if your arduino on the spider is already using those pins then you'll have to do a bit of changes of the code but you'll get to that and it shouldn't be too big a challenge
09:38 AM durrf: i know some of my receivers support serial interface for one-wire communication, i wonder if that would be easier
09:38 AM anonnumberanon: actually yes, a LOT better
09:40 AM durrf: baby steps, durrf, baby steps
09:40 AM durrf: lol
09:42 AM anonnumberanon: and by better i meant easier :)
10:39 AM anonnumberanon: humanoid robot falls and breaks
10:39 AM anonnumberanon: https://www.youtube.com/watch?v=SzQdn1p_4vI&t=15m46s
01:43 PM rue_bed: no compliance
01:58 PM ace4016: most of those things never do have
03:16 PM durrf: my robot is alive... kind of!
03:16 PM durrf: lmao
03:16 PM mumptai: show us
05:22 PM durrf: https://i.imgur.com/p8XgX7V.png
05:22 PM durrf: gotta do cable management but theres some other things i gotta work out first
05:29 PM deshipu: durrf: nice! I have a similar one, you can steal my gait code if you want
05:29 PM deshipu: durrf: http://tote.readthedocs.io
05:30 PM durrf: bookmarked!
05:30 PM durrf: very nice
05:35 PM durrf: now if only i could find my servo centering thing
05:35 PM durrf: lol
06:26 PM rue_mohr: wtf, tire pressure guages are $2 ea at the dollar sotre
06:27 PM rue_mohr: ARG CANT GET IT APART
06:30 PM * rue_shop3 puts the hammer away
06:30 PM rue_shop3: huh
06:30 PM rue_shop3: well
06:30 PM rue_shop3: thats interesting
06:30 PM rue_shop3: MUCH stiffer spring that I'd have thought
06:32 PM rue_shop3: D=9mm
06:35 PM durrf: its sort of moving!!
06:35 PM durrf: it sort of seems like the servos are underpowered, im guessing 12 servos is too many to power through the arduino's usb port?
06:36 PM rue_shop3: you know a usb port is good for like .5A right?
06:37 PM durrf: o
06:42 PM rue_shop3: iirc a servo pulls about .3A when its motor is on
06:42 PM rue_shop3: so, you can only run 1 servo at a time, given the timing that means your limited to 8 servos
06:42 PM rue_shop3: I said it, you wont end up understanding that, if you even read it...
06:42 PM rue_shop3: dont know why I bother
06:43 PM rue_shop3: might as well be telling people about the ache in all the diodes down my left side
06:46 PM durrf: my bad didnt notice the "EEs only" sign
06:47 PM rue_shop3: <<
06:47 PM rue_shop3: >>
06:47 PM rue_shop3: mmm
06:47 PM rue_shop3: what you got 12 servos on?
06:48 PM durrf: a quadruped robot, i guess my next step is a seperate board to handle the power
07:08 PM rue_mohr: I wonder how much of life if usefull time
07:08 PM rue_mohr: lets guess someone is going to live 80 years
07:08 PM rue_mohr: and sleeps an average of 7 hours a day
07:08 PM ace4016: define useful
07:08 PM rue_mohr: 29219.5 days of life
07:09 PM rue_mohr: 8522.3 days of sleep
07:10 PM rue_mohr: ah but wait, lets write off .... hmm the fist 12 years
07:10 PM rue_mohr: 68 yeras
07:10 PM rue_mohr: 24836.5 days
07:11 PM rue_mohr: 173856 days of sleep
07:11 PM rue_mohr: hours sorry
07:11 PM rue_mohr: 7244 days of sleep
07:12 PM rue_mohr: 17592.5 days awake
07:12 PM rue_mohr: now lets say that each meal is averages a half hour
07:12 PM rue_mohr: *3 meals a day
07:13 PM rue_mohr: 1552 days eating
07:13 PM rue_mohr: 16040.5 days awake and not eating
07:14 PM rue_mohr: thats only about 44 years of life
07:14 PM rue_mohr: so, we prettymuch get 50%
07:15 PM rue_mohr: I wonder what we get for personal time, aka, not at work
07:25 PM Tom_L: so use time efficiently
07:27 PM Tom_L: so i've put togther somewhat of a metal shopping list
07:28 PM rue_mohr: see what a tight design has done to you?
07:28 PM Tom_L: what do you mean?
07:28 PM rue_mohr: you should be out in a huge scrap pile, just finding what will work
07:28 PM Tom_L: i am
07:28 PM Tom_L: i should video the next trip
07:28 PM rue_mohr: but now your reduced to a few specific pieces, without which your foo
07:28 PM Tom_L: you would be proud
07:28 PM Tom_L: ducking under huge magnetic cranes
07:29 PM rue_mohr: Tom_L, my mind might be comming apart,
07:29 PM rue_mohr: if I go insane, tell them I thought so
07:29 PM Tom_L: i've said that for years
07:29 PM Tom_L: but then nobody really gets me either
07:30 PM rue_mohr: I'v been having more and more concerning errrors
07:30 PM Tom_L: i've somewhat scouted out the pile of steel but it changes
07:30 PM rue_mohr: and there is a suggestion that the issue with my leg a long time ago with a micro stroke
07:30 PM Tom_L: so i make a list and see what i can come close to
07:31 PM Tom_L: eat better and exercise
07:31 PM Tom_L: i bet you do neither
07:33 PM rue_mohr: made a major diet shift after I was at the school in vancouver turned out my cholesterol was thru the roof
07:33 PM Tom_L: left side is bad isn't it?
07:33 PM rue_mohr: and another one about a year ago when it was still too high
07:34 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Column_Mill_Design.jpg
07:34 PM Tom_L: added some side braces and changed the standoff to 4" tube
07:34 PM rue_mohr: my left leg stopped responding, it was thought to be a nerve in my back, but there was anomolies that were dismissed
07:34 PM rue_mohr: none of the treatments worked
07:34 PM Tom_L: don't use chemicals for it
07:35 PM rue_mohr: end caps on the tubes to keep them from sheering
07:35 PM Tom_L: go see a chiropractor if you think it's nerve related
07:35 PM rue_mohr: no
07:35 PM rue_mohr: I did, and a whole bnunch of fancy treatments had no effect
07:35 PM rue_mohr: hence the thought it was a micro stroke
07:35 PM rue_mohr: it didn't line up with nerve stuff properly
07:36 PM Tom_L: i lost some control of my left arm for a while
07:36 PM Tom_L: it's still not like it should be
07:36 PM rue_mohr: but I'm flagging mind issues that indicate to me that there are other problems
07:36 PM Tom_L: it's hard to find the right keys on the keyboard now that i can't feel my left index finger
07:36 PM rue_mohr: did they test for a stroke
07:36 PM rue_mohr: ?
07:37 PM Tom_L: it still works, just feels like it's asleep and won't wake up
07:37 PM Tom_L: you're too young to have problems
07:38 PM rue_mohr: that kinda thinking leaves people with severe issues undiagnosed
07:39 PM Tom_L: well, most don't care anymore. they're about the money
07:40 PM Tom_L: and their diagnosis will generally lead to taking chemicals to fix everything
07:40 PM Tom_L: i'm not of that mindset
07:40 PM Tom_L: i'm doing much better now than i was
07:41 PM Tom_L: i think i like this new design alot better than the first
07:41 PM rue_mohr: I'm feaking out, I need to know if something is going on with my head
07:45 PM * Tom_L left here and went somewhere else
07:45 PM rue_mohr: our lightbulbs are E26 aren't they?
07:45 PM Tom_L: E17 E26 europe E27
07:45 PM Tom_L: C9
07:45 PM Tom_L: C9 Bulbs have an intermediate or E17 base. These are historically known as the old Christmas light bulb size. Medium Bulbs have a E26 base (E27 in Europe). This is the same size as a standard household bulb.
07:45 PM rue_mohr: hmm
07:46 PM rue_mohr: I need an led blue lamp, and do you think I can get one in north america??? sure $400...
07:46 PM Tom_L: led blue lamp?
07:47 PM Tom_L: ir?
07:47 PM rue_mohr: no, just blue
07:47 PM rue_mohr: "ammonia leak" blue
07:47 PM rue_mohr: (its for work)
07:47 PM Tom_L: i got a couple blue leds and used maybe one
07:48 PM Tom_L: maybe smt, i don't remember
07:48 PM Tom_L: https://www.1000bulbs.com/product/193020/LED-80145SU.html?gclid=EAIaIQobChMIvb_Gy57v1wIVkIl-Ch0ecAP5EAQYBSABEgLeIfD_BwE
07:48 PM Tom_L: that?
07:49 PM Tom_L: that's probably just paint though
07:49 PM Tom_L: or die in the plastic
07:51 PM Tom_L: https://www.homedepot.com/b/Lighting-Light-Bulbs-LED-Light-Bulbs/Blue/N-5yc1vZbm79Z1z0vbum
07:51 PM Tom_L: not sure what you're after
07:56 PM rue_shop3: hey, that might work, I think home depot can ship stuff here in not-more-than 2 weeks...
08:00 PM Tom_L: next i need to figure out how to bend sheet metal to make box way covers
08:00 PM Tom_L: so they interlock
08:06 PM rue_shop3: ?
08:06 PM rue_shop3: your suppsed to use rubberized cardboard
08:06 PM rue_shop3: :)
08:07 PM rue_shop3: anyone want a red herring sandwhich?
08:21 PM Tom_L: mmm that looks too complicated for what i'm doing
08:34 PM evilroot: Tom_L: a sheet metal brake?
09:01 PM rue_shop3: wow, even with my 3db line amp, the volume level out of this monitor is horrid
09:02 PM rue_shop3: and the response is horrid, this needs the correction of a major EQ
09:03 PM rue_shop3: theBear, can you listen to bad speakers and come up with the approx equiv tube it sounds like the audio is comming out of?
09:04 PM rue_shop3: it dosn't help I dont have a project on my mind right now
09:04 PM rue_shop3: I'm kinda grazing
09:13 PM Tom_L: evilroot using tools i have
09:13 PM Tom_L: that is not one of them
09:23 PM rue_shop3: that belt guard?
09:28 PM Tom_L: no
09:28 PM Tom_L: this is for covering the ways
09:29 PM Tom_L: that will change a bit too as the build begins
09:29 PM Tom_L: but hopefully when it's done i will keep up the changes in the cad model
10:07 PM rue_shop3: I was suprized that the haas machines use those same rectangular linear bearings
10:07 PM rue_shop3: I'd have thought they would use box/dove sliders
10:08 PM rue_shop3: I had a dangerous thought yesterday
10:08 PM rue_shop3: I can buy a string of christmas lights for $8
10:08 PM rue_shop3: I think they have about 24 leds on them
10:08 PM rue_shop3: https://www.aliexpress.com/item/Green-14-17-3mm-LED-Green-light-emitting-diode-1kpcs-1000pcs-lot/32669353700.html
10:09 PM rue_shop3: :/
10:09 PM rue_shop3: so...
10:09 PM rue_shop3: anyone following me?
10:10 PM rue_shop3: oh look! I left myself a todo list on the monitor!
10:13 PM Tom_L: you can get high quality linear slides, just not from china
10:14 PM rue_shop3: I"v always thought of modular sliders as a copout
10:14 PM Tom_L: and the quantities they buy them in they probably get a good price
10:14 PM Tom_L: no, they're actually pretty good
10:14 PM Tom_L: that set i'm getting is the best deal i can find anywhere
10:15 PM Tom_L: theirs are bigger i'm sure
10:15 PM Tom_L: to handle the heavier loads
10:16 PM Tom_L: their ballscrews didn't look as big as i'd have expected though
10:16 PM Tom_L: my bud's machine's are around 3"
10:16 PM Tom_L: it's made for cutting steel though
10:17 PM Tom_L: even alibaba was higher
10:17 PM Tom_L: or whaever it's called...
10:20 PM Tom_L: https://www.aliexpress.com/item/6-sets-linear-rail-SBR16-L300-1500-1500mm-SFU1605-350-1550-1550mm-ball-screw-3-BK12/32650072004.html?spm=2114.search0104.3.23.2ZQLHB&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_5000015_10151_10344_10068_10130_10345_10324_10342_10547_10325_10343_10546_10340_10341_10548_10545_5130015_10541_10084_10083_10307_5690015_10539_5080015_10312_10059_10313_10314_10534_100031_10604_10603_10103_10605_5060015_10596_10142_1
10:20 PM Tom_L: that one is similar but costs more
10:20 PM Tom_L: Z is kinda short on that one
10:23 PM rue_shop3: when I made that last machine I'd surcome to the realization I never use more than about 1" of Z travel over the table
10:23 PM rue_shop3: my first machine was built with 18" of room
10:24 PM rue_shop3: so it only clears about 4cm
10:28 PM Tom_L: you should be using more
10:29 PM Tom_L: this design should give me at least 6" or more
10:29 PM rue_shop3: in years I never have
10:29 PM Tom_L: i haven't stopped to calculate z travel yet really
10:29 PM Tom_L: i have
10:29 PM rue_shop3: almost everything is simple cutout of flat stuff
10:29 PM Tom_L: like when i put a vise on the bed, everything raises up a few inches
10:29 PM Tom_L: longer drills need more room than short endmills
10:30 PM Tom_L: flycutters are even shorter so the must be able to reach the bed
10:30 PM rue_shop3: the gantry only clears the table by a little more than 4cm
10:30 PM Tom_L: that's the plus with this column design
10:31 PM Tom_L: the whole Z assembly moves including the standoff. in the first one, the standoff was rigid and i realized my flaw there
10:32 PM Tom_L: they all use counterweights in the column to offset it
10:33 PM Tom_L: that's also the problem with my sherline. sometimes the arm hits the vise
10:34 PM Tom_L: i hope to overcome those limitations with this one
10:34 PM rue_shop3: should I note your sentence structure is comming apart latley?
10:35 PM Tom_L: you could i suppose
10:35 PM Tom_L: this keyboard sucks too
10:35 PM Tom_L: several keys stick so i end up going back
10:36 PM rue_shop3: your skipping words...
10:36 PM rue_shop3: its unlike you
10:36 PM * Tom_L looks back at rue_shop3's timeline
10:36 PM rue_shop3: yea, I'm sloppy as all hell, thats not the point
10:41 PM Tom_L: at least the channel isn't as dead as it was for a while
10:41 PM rue_shop3: ok...
10:42 PM rue_shop3: the ups keeps clicking...
10:42 PM rue_shop3: says c8
10:42 PM Tom_L: power gonna go out?
10:44 PM rue_shop3: when power was removed, the battery capacity dropped to 20% within a minute
10:44 PM rue_shop3: there is no load on it right now...
10:44 PM rue_shop3: huh
10:45 PM Tom_L: shorted cell?
10:45 PM rue_shop3: all the batteries I have are well aged
10:45 PM rue_shop3: so, it prolly needs a new set of them
10:49 PM orlock: rue_shop3: ever build a walking bot?
10:49 PM rue_shop3: yes
10:49 PM rue_shop3: did I ever finish a walking robot, technically.... no
10:50 PM rue_shop3: wait, the 3 servo ones worked
10:50 PM orlock: i'm wondering about walking mechanisms - the simpler the better
10:50 PM rue_shop3: I have a number of hexapods around
10:50 PM orlock: think mor e"clockwork toy" than boston dynamics
10:50 PM rue_shop3: 3 servo, have fun, its not technically walking
10:50 PM orlock: yeah
10:50 PM orlock: mor eshuffling
10:51 PM rue_shop3: rowing
10:51 PM orlock: yeah
10:51 PM orlock: not being able to turn isnt such a concern either
10:52 PM rue_shop3: 3 servo can
10:52 PM rue_shop3: you dont recall the ones that me and rifraf made?
10:52 PM Tom_L: i started one but didn't get it walking
10:53 PM rue_shop3: http://ruemohr.org/~ircjunk/robots/tiptoes/tiptoes-fred.html
10:53 PM orlock: rue_shop3: You know wind up toys, now the the feet are almost like forks with the tines that mesh?
10:53 PM orlock: So theres no balancing involved when one foot is off the ground
10:54 PM rue_shop3: http://roboreprap.com/tiptoes/index.htm
10:56 PM orlock: http://cyberneticzoo.com/steammen/1870-steam-man-e-r-morrison-american/
10:56 PM rue_shop3: huh, all rifrafs stuff is still up
11:00 PM rue_shop3: https://wi-images.condecdn.net/image/mmo6MBJoQ3G/crop/1440/0.523560209424 BEHIND YOU!!! LOOK OUT!! ITS A HUMAN!!!!
11:09 PM rue_shop3: ooo wait, I have a $100 bonus I can spend...
11:11 PM anonnumberanon: durrf, https://www.amazon.com/WHDTS-XL4015-Adjustable-Converter-Voltmeter/dp/B073WNR7QD/ref=sr_1_8?ie=UTF8&qid=1512364202&sr=8-8&keywords=5A+5V+dc+dc
11:11 PM anonnumberanon: what did deshipu use for servo power on his tote?
11:11 PM rue_shop3: hmm $9 eh?
11:12 PM orlock: rue: Where did Kat end up? lurking, or in self-imposed isolation elsewhere?
11:12 PM rue_shop3: https://www.aliexpress.com/item/5A-5-36V-To-1-2V-32V-Step-Down-Module-DC-DC-Adjustable-Voltage-Buck-Converter/32779471242.html
11:12 PM rue_shop3: 200% markup for amazon, huh
11:14 PM rue_shop3: oh no, there is nothing I want
11:14 PM rue_shop3: what a nightmare
11:14 PM rue_shop3: a free aliexpress $100 shopping spree and there is nothing I want
11:15 PM orlock: rue_shop3: get a training lock
11:15 PM orlock: they are like, $15
11:15 PM orlock: and are awesome fun
11:16 PM rue_shop3: na, I gave up after 2 days of trying to pick my bedroom lock with modified windshield wipers
11:16 PM orlock: that
11:16 PM orlock: is why you need a training lock
11:16 PM orlock: it comes with lockpics as well
11:17 PM orlock: they are transparent plastic with brass internals - i handed one to a guy here, he picked it in about 30 seconds
11:17 PM orlock: going from "Oh, cool, whats this" to " My faith in phhysical security has been shattered"
11:18 PM anonnumberanon: rue_shop3> it dosn't help I dont have a project on my mind right now
11:18 PM rue_shop3: oooh ok, prices didn't go up that much, I'v switched it to use CAD instead of USD
11:18 PM anonnumberanon: make a humanoid biped, it's an order
11:19 PM rue_shop3: I am
11:19 PM rue_shop3: but its cold out and I need an indoor project
11:19 PM anonnumberanon: or work on robotic hands for amputees who lost theirs and sell them to them so you can finance your research
11:19 PM anonnumberanon: or get into genetics research to be able to alter your own gense
11:19 PM orlock: Then you start drumming up business
11:20 PM anonnumberanon: I'm just enumerating my dream projects
11:20 PM anonnumberanon: lol
11:20 PM orlock: by abducting random peopl eand aumputating their hands
11:20 PM rue_shop3: tell me what parts I'll need
11:20 PM rue_shop3: how many stm32F103?
11:21 PM anonnumberanon: <orlock>
11:21 PM anonnumberanon: are you willing to put in the software research time required to replicate the work of dr guero?
11:22 PM anonnumberanon: if so you'll have best robot walk (for non-multi-million-dollar robots)
11:22 PM rue_shop3: your going to just ignore the work of Octavious?
11:22 PM orlock: anonnumberanon: i dont want the best
11:22 PM orlock: i just want massive amounts of contact area
11:23 PM anonnumberanon: rue_shop3> hmm $9 eh?
11:23 PM rue_shop3: $4.50 from china
11:23 PM rue_shop3: direct
11:23 PM anonnumberanon: time is money and it's a horrible feeling having to wait weeks for a part that is majorly required in a project
11:23 PM anonnumberanon: besides maybe orlock is not broke
11:23 PM anonnumberanon: i meant durrf
11:25 PM anonnumberanon: rue_shop3> how many stm32F103?
11:25 PM anonnumberanon: since that part is hot right now get at least 10
11:31 PM rue_shop3: hmm, what parts are needed for a 12' mecha
11:31 PM rue_shop3: I have the stuff for the optical subcontroller links
11:31 PM rue_shop3: I have the driver transistors for the valves
11:31 PM rue_shop3: I have opto isolators for the drivers
11:32 PM rue_shop3: I suppose I could spend money on a few big ticket items
11:32 PM rue_shop3: like the vr screen
11:33 PM anonnumberanon: will you be using an IMU to keep it balanced?
11:33 PM anonnumberanon: if so get that
11:33 PM rue_shop3: no, I'll use a human
11:33 PM anonnumberanon: in the robot or outside?
11:33 PM rue_shop3: outside
11:34 PM rue_shop3: so, yea, I still need a sensor for the feedback
11:34 PM anonnumberanon: >trusting a human to control many motors to keep a giant mech balanced
11:34 PM rue_shop3: its ok, robot is compliant and wont snap if it falls
11:35 PM * anonnumberanon smirks
11:40 PM rue_shop3: should I buy more silly little hobby servos?
11:41 PM rue_shop3: https://www.aliexpress.com/item/2-Axis-Original-FPV-Special-dedicated-Nylon-PTZ-for-SG90-MG90-Servo/32654752019.html
11:41 PM rue_shop3: I'm not going to buy it, but I like the deisgn
11:42 PM rue_shop3: I like a) how they dont mention the servos aren't inlcuded, b) how, like so many things, its listed as a voltage regulator
11:42 PM anonnumberanon: no but you could get gears, aluminum barstock and get to work on making silly little strong and fast diy servos
11:42 PM anonnumberanon: CHALLENGE
11:42 PM rue_shop3: dude, been there, done that
11:43 PM rue_shop3: I have a few in a box somewhere around here
11:43 PM anonnumberanon: you haven't made really really small ones
11:43 PM anonnumberanon: like sg90
11:43 PM rue_shop3: why, I can buy guts from china that have a servo board in them
11:50 PM anonnumberanon: M51660L is about a dollar, sure
11:50 PM anonnumberanon: plus FETs
11:50 PM anonnumberanon: what would a good MCU be to make a digital servo, the avrs are too expensive and probably overkill for this
11:51 PM rue_shop3: ?
11:51 PM rue_shop3: 50c for a t13
11:51 PM anonnumberanon: that's not bad
11:51 PM rue_shop3: for a good coder, thats plenty of resources
11:51 PM orlock: anonnumberanon: what level of "digital" do you mean?
11:51 PM orlock: it would come down to the adc would it not?
11:52 PM rue_shop3: orlock, more digital than pwm :)
11:52 PM orlock: also the definition of servo
11:52 PM anonnumberanon: orlock, i mean controlled by a microcontroller, not an anlog ic
11:52 PM anonnumberanon: meaning possibility to connect to it via TTL instead of PWM
11:52 PM * rue_shop3 is pretty sure that a hobby servo will operate with ttl level pulses
11:52 PM orlock: SO, you have a motor, and some sort of feedback for your control loop
11:53 PM anonnumberanon: possibility to retrieve info from the servo, such as power consumption and temperature
11:53 PM orlock: That feedback mechanism would determine the mcu requirements?
11:53 PM orlock: standard hobby servos use pots
11:54 PM orlock: and your standard avr has a 10 bit adc, for 1024 possible positions
11:54 PM anonnumberanon: yeah one with an MCU would need at least one analog to digital converter pin available on the MCU to read the pot
11:54 PM anonnumberanon: digitals still have pots
11:54 PM orlock: throw out the established paradigm!
11:54 PM orlock: they don't need to have potts
11:54 PM orlock: thats like, your choice!
11:54 PM anonnumberanon: nah man sorry to burst your bubble
11:55 PM anonnumberanon: but you need one
11:55 PM anonnumberanon: or some encoder
11:55 PM anonnumberanon: rue_shop3, tried to find better pots than the ones in hobby servos and could not
11:55 PM rue_shop3: https://www.aliexpress.com/item/7-Inches-1024-600-IPS-Screen-Display-LCD-TFT-Monitor-EJ070NA-01J-with-Remote-Driver-Control/32709495542.html
11:55 PM orlock: anonnumberanon: So you mean you dont need one
11:55 PM anonnumberanon: better == mostly cheaper, also more accessible
11:55 PM rue_shop3: heh, who can work out what major peice is missing
11:55 PM anonnumberanon: orlock, i mean you always need one
11:55 PM orlock: OR some encoder.
11:56 PM orlock: which is not wlasy need one
11:56 PM rue_shop3: hint, connection 10
11:56 PM anonnumberanon: rue_shop3, the screen size is pissing
11:56 PM anonnumberanon: that's major
11:56 PM orlock: anonnumberanon: You Could use an encoder, and make a digital unlimited rotation servo
11:56 PM rue_shop3: its for google cardboard
11:56 PM rue_shop3: 7" is great
11:57 PM anonnumberanon: orlock, everything is possible, except when it comes to part availability and cost, do you have an encoder in mind?
11:57 PM orlock: anonnumberanon: Thats what i was saying. If you are deciding to use a pot for your feedback, then the ADC becomes a big issue. Standard AVR's are 10 bit, for 1024 positions
11:57 PM anonnumberanon: orlock, are you sure? i thought they gave more than that
11:57 PM orlock: Not really, i designed my last one from scratch, except for the photointurruptors
11:58 PM anonnumberanon: yeah, but also for a servo like this your encoder would have to be very small
11:59 PM rue_shop3: https://www.aliexpress.com/item/8-5-12-Inch-Portable-LCD-Handwriting-Board-With-Pen-Electronic-Writing-Pad-Drawing-Tablet-Notepad/32824492242.html
11:59 PM anonnumberanon: unless you make your own servo cases and decide to put it in the gearbox (or right outside of it) and could get away with a disk that's like 1.5-2" in diameter
11:59 PM rue_shop3: #!#%$#@$^!$@%^ no save->SD !!#$%@#$^@$#????