#robotics Logs

Feb 26 2017

01:21 AM Jak_o_Shadows: Hmm. THe little 9g servo motors can do 1.6 kg-cm, or 0.157 Nm
01:23 AM Jak_o_Shadows: APPARENTLY, according to my calculations, a stewart platform of this geometry (http://pasteall.org/pic/show.php?id=113002 - height is 0.1m) can take a load of 2.5 kg axially
01:24 AM Jak_o_Shadows: That's with 30mm lever arms. So quite small
01:25 AM Jak_o_Shadows: Increasing said lever arm decreases the force I can carry
01:34 AM justanotheruser: thanks z
01:41 AM zhanx-: ?
02:19 AM justanotheruser: thanks z6
02:20 AM justanotheruser: any advice for taking a job to a new machinist
02:21 AM SpeedEvil: measure twice, cut once.
02:21 AM justanotheruser: I'm supposed to tell them that?
02:21 AM justanotheruser: heh
02:22 AM SpeedEvil: Ah - I misread your query
03:43 AM rue_house: well, so far my new cnc is doing a great job on aluminum plate
03:43 AM rue_house: I'm going easy on it, I'll push it later
05:47 AM Jak_o_Shadows: rue_house - remember the 120 degree angle localisation thing? I finally made a html animation of it
05:47 AM Jak_o_Shadows: http://jak-o-shadows.github.io/electronics/robot/localisation/angles120anim.html
05:47 AM Jak_o_Shadows: Look in the code - there's a couple of flags and values to play with (just display things mind)
05:55 AM squirrel is now known as veverak
06:07 AM bolt_ is now known as bolt
08:43 AM Tom_itx is now known as Tom_L
12:09 PM rue_bed2: ah sweet
12:11 PM rue_bed2: I need to get an avr version of that calculation working
12:12 PM rue_bed2: every alg I'v seen right now faults if the robot leaves the triangle of the 3 beacons its within
12:15 PM rue_bed2: I'm esp impressed that the javascript works properly
12:34 PM veverak: :
12:34 PM veverak: :D
02:23 PM rue_house: twelve, thirteen, fourteen fifteen, sixteen, seventeen, eighteen, nineteen, ayeteen, beeteen, ceeteen, deeteen, eeeteen, effteen, twenty,
02:25 PM veverak: :)
02:26 PM justanotheruser: rue_house: https://en.wikipedia.org/wiki/Tonal_system
02:56 PM justanotheruser: spring pins are difficult to compress
03:05 PM justanotheruser: how do you typically insert a spring pin into a hole, just with a hammer?
03:06 PM justanotheruser: slotted spring pins
03:06 PM justanotheruser: I tried to use a hammer in a test run and it stripped the metal
03:17 PM SpeedEvil: press them in
04:06 PM justan0theruser: SpeedEvil: It requires a drill press?
04:22 PM SpeedEvil: No.
04:22 PM SpeedEvil: Press - using continuous force.
04:28 PM justan0theruser: SpeedEvil: with what machine?
04:28 PM justan0theruser: I'm not strong enough to do it myself, it's a 1cm spring pin
05:11 PM z64555: hydraulic press
05:11 PM z64555: um.
05:12 PM z64555: Make sure that the hole is the right diameter
05:12 PM z64555: if it's a softer metal, like aluminum, you should ream it a bit larger
05:13 PM zhanx: ok 1 week test started with a 5 minute sample rate.
05:14 PM orlock: What are you sampling?
05:14 PM orlock: and what with?
05:15 PM orlock: zhanx: http://en.crypt.net.au/ESDBench/IMG_1445.JPG.jpg
05:15 PM zhanx: Soil Moisture content and with generic flying fish soil sensor
05:16 PM zhanx: well thats one way to make me jealous
05:17 PM orlock: zhanx: workbench came from work, took me a minor flood and 6 months to get around to making space to put it together
05:17 PM zhanx: well its still nice
05:18 PM orlock: yeah it's awesome
05:18 PM orlock: perfect spot to put a printer too
05:18 PM zhanx: i might heat my back porch this coming winter so i got a workspace
05:18 PM zhanx: or a cnc on the top of it
05:18 PM orlock: with full metal enclosure to prevent any fire escaping
05:19 PM orlock: my printer warped!
05:20 PM orlock: the main plate that makes up the chassis, it's always under tension, that and the heated enclosure over enough time.. it's bowed
05:20 PM orlock: i can probably lay it flat and hit it with a heat gun
05:20 PM zhanx: oh
05:20 PM zhanx: yea you could get it close
05:20 PM orlock: waiting for a quot on getting it and the build plate carrige laser cut out of 6mm aluminium
05:21 PM orlock: it still works, just the belt that moves the print head left-right needs to be retensioned
05:21 PM zhanx: studying this right now http://www.fao.org/docrep/x0490e/x0490e0e.htm
05:22 PM orlock: What, did something just get legalised there? ;)
05:22 PM zhanx: no thats for the garden, I am going high tech till then
05:22 PM zhanx: :D)
05:23 PM orlock: Cool
05:23 PM orlock: my brother works at a place that specialises in that stuff
05:23 PM orlock: agri-bio science research
05:23 PM zhanx: nice
05:23 PM orlock: but he's a sysadmin on the bio side
05:24 PM zhanx: ask him a question.... never mind
05:24 PM zhanx: I was like wait was the average wilt ratio to soil moisture that plants can come back from
05:24 PM zhanx: aka how bad can i mess up
05:25 PM rue_shop3: hah
05:25 PM rue_shop3: whats IS the ratio?
05:26 PM rue_shop3: I need a system for watering the plants in the greenhouse, I have the sprayer and the pump
05:26 PM zhanx: well i can give your the math for it
05:26 PM orlock: zhanx: he looks after a small cluster that does dairy herd DNA stuff
05:26 PM zhanx: ETc adj = (Ks Kcb + Ke) ETo (80
05:27 PM orlock: so you can chose your cow's attributes and what you want to get and it will tell you which bull should be the daddy
05:27 PM orlock: or something
05:27 PM zhanx: nice that would be fun too
05:28 PM zhanx: rue_shop3: when i get it all figured out, I will let you know the average analog value of the moisture reading to shoot for as a base line time
05:28 PM zhanx: test
05:31 PM rue_shop3: you have to cycle the moisture level you know
05:31 PM rue_shop3: cant just hold it at a level
05:31 PM zhanx: yep
05:31 PM rue_shop3: so tell me the amplitude and freq of the cycle :)
05:31 PM rue_shop3: when you find out
05:31 PM zhanx: well, you could, but you would rot out the roots
05:31 PM rue_shop3: I should ask the pot grower behind me
05:32 PM zhanx: wtf
05:32 PM zhanx: and that is turned back off
05:33 PM rue_shop3: ?
05:33 PM z64555: "I should ask the pot grower behind me" lol.
05:33 PM rue_shop3: its no secret, me and the neighbour get flooding in the stench on a regular basis
05:33 PM rue_shop3: (I'm sure I wouldn't mind if I were a pot smoker)
05:33 PM zhanx: oh my other computer randomly turned on
05:34 PM rue_shop3: no, magic packet
05:34 PM rue_shop3: who knows its mac address
05:34 PM zhanx: its wifi connected no so magic packet
05:38 PM z64555: If it's in sleep mode, it'll power up for a bit, then save everything to disk before shutting down
05:39 PM * orlock goes to throw more space at HP's ALM - QC Edition
05:39 PM zhanx: i have a 3 year old as prime suspect
06:03 PM rue_shop3: I thought magic packets were tcp/ip
06:06 PM zhanx: if the computer is off, no power to wifi card
06:08 PM orlock: zhanx: one thing i want to play with using my massive free time
06:08 PM orlock: zhanx: i've got a pair of remote control powerboards and some socket 1155 systems that i don't want running all the time
06:09 PM orlock: i want to have them dynamically power up and down depending on load
06:09 PM zhanx: nice
06:10 PM orlock: it's not an especially hard problem, or worthwhile, but i have all of the hardware to do it
06:10 PM zhanx: i think rue_shop3 can help you with that
06:10 PM orlock: i need to make a server nook first though
06:10 PM orlock: to put a modem, router, UPS and server
06:11 PM zhanx: put all the hardware in place first etc
06:12 PM orlock: no, this is more just priorities
06:12 PM orlock: i nneed to clean up the shit inside that's used on a day to day basis
06:12 PM orlock: before i start building server farms in the workshop
06:13 PM zhanx: lol, you sound like me
06:13 PM zhanx: i need to clean to work
06:14 PM zhanx: suppose i should restart this experiment. With Temp sensors
06:37 PM zhanx: ok added temp sensors and restarting experiment