#robotics Logs

Aug 29 2014

00:00 fluffywolf make it move 4-5 inches and I'll think about it. :P
00:01 rue_more ok I'm either gonna do soemthing or fall asleep in this chair
00:01 rue_more whch would technically be doing something
00:01 fluffywolf and it's way past my bedtime. bbl, sleep.
00:03 rue_shop3 pls tell me to make a disc sander tommorow
00:05 rue_shop3 1750 rpm, k
00:11 rue_shop3 hahahah I forgot about the LM723
00:11 rue_shop3 I suppose I could use that again
00:17 rue_shop3 TL494 was a problem because of the max 80% duty
00:25 rue_shop3 wow, I'v thrown out more ideas on this power supply than the number of ideas I typically have in a whole project
00:27 rue_shop3 nope, I'm falling asleep
01:17 botnut anyone have any thoughts on functional programming languages - i.e. scala, elixir, erlang, haskell ?
03:45 Tom_itx http://www.electronicproducts.com/Optoelectronics/Image_Sensors_and_Optical_Detectors/15_amazing_images_captured_by_Google_Earth_s_satellites.aspx
05:40 deshipu could someone please tell me who is right in this thread? I think I might be going crazy? It's about electric noise for the servos: http://letsmakerobots.com/servo-problems#comment-120688
05:43 Jak_o_Shadows I haven't had many problems
05:44 Jak_o_Shadows Shove a cap over each servo.
05:59 deshipu Jak_o_Shadows: what I mean is his theory about "current getting dirty as it flows past daisy-chained devices"
06:00 Jak_o_Shadows technically speaking, I wouldn't think it's current.
06:00 Jak_o_Shadows I'm not an electrical engineer, just a hack.
07:32 robotust1a psycho robot
09:49 mrdata deshipu, the posters in the thread zseem to be giving good advice
09:50 mrdata i had trouble with a servo controller being jittery before i added some filtering
09:50 mrdata also trouble with a servo going past its limit
09:50 mrdata also trouble with a servo breaking plastic teeth
09:52 mrdata if you have a schematic, i can make suggestions there probably
09:52 mrdata also you can check and calibrate each servo in isolation
10:12 mrdata pc power supply should be fine on the bench; but daisy chaining a lot of servos will make it noisy
10:14 mrdata in my case, the servo was jittery because noise got back to the controller
10:15 mrdata an RC filter on the controller's power fixed that
10:51 deshipu mrdata: I'm "deshipu" there
10:52 deshipu mrdata: I had a problem with what "bdk6" wrote
11:30 peepsalot hi netwoodle
11:30 rue_more I have a servo controller that has NO jitter
11:30 rue_more its serial, runs 8 servos
11:31 rue_more 12000 counts between stops
11:56 rue_more http://2.bp.blogspot.com/-jylVVeGvqUU/UAXibEAaXXI/AAAAAAAAAHs/_C4t4ik2GDQ/s1600/Fig%2B3%2BCC%2BOperation%2BCircuit.bmp
11:56 rue_more rue_shop3, print that
12:50 mrdata deshipu, do you mean the comment bdk6 @ Thu, 2014-08-28 04:21
12:50 deshipu mrdata: yes
12:50 mrdata paragraph 2 should probably quantify the noise
12:50 deshipu that's the one I linked to
12:51 mrdata i expect it's in millivolts
12:51 deshipu the guy seems to think that the problem is not with the shared wire, but with the fact that one device comes before the other
12:52 deshipu mrdata: oh, the noise can be quite large if you have very thin wires
12:52 deshipu mrdata: and of course then adding more wires will help
12:52 deshipu but using a thicker wire would help better
12:53 mrdata i've never heard of minimum curre nt for proper regulation
12:55 deshipu me neither
12:55 deshipu but I don't feel like researching and debunking that
13:04 rue_shop3 yaya! my gears are here!
13:04 rue_shop3 in my 48V ROV it turns out all the noise was in the ground lines
13:05 rue_shop3 when the mtoors kicked in, it would raise ground enough to reset the avr
13:08 mrdata deshipu, thing is, it is not proved that the jitter is caused by the motor power wiring yet; my jitter was caused by noise propagating back to the controller's power
13:09 rue_shop3 servos are digital, unless the timing of the avr is going out, power supply noise should not cause jitter
13:09 mrdata what gauge wiring is on the motors?
13:10 rue_shop3 I seen jitter caused by two things, a) crappy servos, b) bad software lilbraries like SSC and arduino
13:11 deshipu rue_shop3: my guess it's not noise, but voltage drop
13:11 mrdata i eliminated the microcontroller and used a Ne555 timer
13:11 mrdata but had to add RC filter on the controller's powerr
13:11 rue_shop3 yea it'll take you 3 days to get the 555 to time right,
13:11 rue_shop3 all the 555 math in the world wont help you have to try and fail till you get the values right
13:12 mrdata naw, calibration was a couple hours
13:12 rue_shop3 BUT
13:12 rue_shop3 I have a tiny13 firmware that takes 2 analog channels and outputs servo pulses
13:12 Tom_itx rue_shop3! clean your shop!!! i can't hardly see you for all the crap!
13:12 rue_shop3 hee
13:13 e_shop3 paws thru his gear collec
13:19 rue_more oh yea, foot stool
13:45 Tom_itx rue_more did you see the google images?
13:46 deshipu I think I killed a LiPo :(
13:46 deshipu I left it connected to an UBEC that has some LEDs showing the charge
13:47 mrdata it went deep cycle?
13:47 deshipu and that discharged it so much, that when I connect it to the charger now, it refuses to charge it and instead displays a "low voltage" error
13:47 mrdata it may be dead, yeah
13:47 mrdata there is a remote possibility you can revice it
13:47 mrdata *revive
13:48 deshipu how?
13:48 mrdata take the battery in your hand and slam it against the table
13:48 deshipu haha
13:48 mrdata once or twice
13:48 deshipu no, thanks, I saw that on youtube
13:48 mrdata seriously
13:48 mrdata it worked for me
13:49 rue_shop3 Tom_itx, google images?
13:50 mrdata the shock might just break some of the whiskers that form
13:50 mrdata during deep discharge
13:50 rue_shop3 yay! I made a stool
13:50 mrdata if it doesnt work, you havent lost anything since the battery is dead anyway
13:50 deshipu I might just move that power switch on the other side of that ubec
13:51 rue_more might be a bit high, its lower than the old one
13:52 rue_more even if nothing else gets done today, at the end of it, I can put my feet up.
13:52 Tom_itx rue_more, http://www.electronicproducts.com/Optoelectronics/Image_Sensors_and_Optical_Detectors/15_amazing_images_captured_by_Google_Earth_s_satellites.aspx
13:54 Tom_itx they're watching you
13:55 trshfx hi
13:56 rue_more meh, I'v seen better google earth images
13:57 rue_more hmm
13:57 rue_more last day to go to stores while they are open
13:58 rue_more seems I'm out of scrap aliminum to melt down
14:00 rue_more hmmm I think my mild headache is demotivating me
14:01 rue_more I got some gloves to use with the sand blaster
14:02 rue_more I need to work out how to cap the bottom of the hopper
14:03 rue_more I should make a pc and install linuxEMC on it
14:03 rue_more Tom_itx, what version you using now/
14:03 Tom_itx 2.5.3
14:03 Tom_itx but 2.6 is out
14:03 Tom_itx debian wheezy
14:03 Tom_itx 2.5.3 is ubuntu 10.04
14:03 rue_more ? is it debian wheezy with emc package installed?
14:03 Tom_itx there's an iso for it
14:03 Tom_itx yes
14:03 rue_more dont think make a whole install cd
14:04 rue_more hmm
14:04 rue_more what she website, dbi?
14:04 Tom_itx but it's a USB/DVD combo burn
14:04 Tom_itx it's too big for a cd
14:04 rue_more apparently I cant write cd's anyhow
14:04 Tom_itx http://linuxcnc.org/index.php/english/download
14:05 Tom_itx haven't actually run 2.6 but i installed it on a ssd
14:05 Tom_itx to test
14:05 Tom_itx not sure if it's 2.6 or the next one but they've improved the trajectory planner considerablly
14:06 Tom_itx they even added one of my requests :)
14:06 rue_more how does the io work? obviously parallel is an option, whats out for usb?
14:06 Tom_itx no
14:06 Tom_itx USB isn't realtime enough
14:06 rue_more ooo
14:06 Tom_itx if you're planning to get serious with it, i'd seriously recomend a mesa card
14:06 Tom_itx the parport does work
14:06 Tom_itx even multiple parports
14:07 rue_more and I know I dont need a real partport, I can make some off the ide cable
14:07 Tom_itx their 5I25 card is probably the best way to go
14:07 Tom_itx fits on a card slot and gives you 2 db25 out
14:08 rue_more its not usb?
14:08 Tom_itx no
14:08 Tom_itx they don't use USB at all
14:08 Tom_itx save mabye for a game controller for jogging or such
14:08 rue_more it makes sense to me
14:08 Tom_itx not fast enough
14:09 rue_more its all software, tooo many delays
14:09 Tom_itx with their cards you get alot faster step rates than you could ever get with the parport
14:09 Tom_itx rtai
14:09 rue_more I can from a ide cable too
14:09 rue_more er do they have an fpga on it
14:09 Tom_itx yes
14:09 Tom_itx 50Mhz iirc
14:09 rue_more pff
14:10 rue_more hmm, lunch
14:10 rue_more hmm lunch...
14:11 rue_more noodles make me ill now
14:11 rue_more which is annoying, they were fast and easy
14:11 Tom_itx http://store.mesanet.com/index.php?route=product/search&filter_name=5i25
14:11 Tom_itx those are 2 card bundles
14:11 Tom_itx one for servo one for stepper
14:11 rue_more hahahahah $200!!!! hahahahahaha
14:11 Tom_itx i think
14:11 rue_more NO!
14:12 rue_more hahaha
14:12 Tom_itx they run commercial equipment with them
14:12 rue_more yea
14:12 rue_more thats fair enough
14:12 rue_more I'm not likley to make a dime off my machine
14:12 rue_more so I'm gonna insert too many into it
14:13 Tom_itx http://store.mesanet.com/index.php?route=product/product&filter_name=7i43&product_id=67
14:13 Tom_itx that's what i got
14:13 Tom_itx plus 3 other cards
14:13 Tom_itx 2 were free for testing
14:13 rue_more it looks like its usb...
14:13 Tom_itx it has usb on it but it's not for linuxcnc
14:14 Tom_itx he does alot of other stuff too
14:14 Tom_itx http://store.mesanet.com/index.php?route=product/search&filter_name=7i47
14:14 rue_more ah
14:14 Tom_itx is the daughter card i have
14:14 Tom_itx differential rs422
14:14 Tom_itx i modded it's drive to use a pair for serial out for many more IO
14:15 rue_more I could custom roll too, but I'm interested in whats out there
14:15 Tom_itx you _can_ use parport but if you want maximum performance those are the way to go
14:15 Tom_itx those are the best going
14:15 Tom_itx there are a couple others selling cards too.. pico is one iirc
14:15 rue_more well what is your step distance?
14:15 rue_more .1 thou?
14:15 Tom_itx what do you mean?
14:16 Tom_itx i get 40000 steps per inch
14:16 rue_more .5 thou?
14:16 rue_more k
14:16 Tom_itx that's a function of the drive though
14:16 rue_more your table is about 4"?
14:16 Tom_itx my travel is about 7 x 9
14:16 Tom_itx and it will do that at 80 ipm on that little thing
14:16 Tom_itx without missing steps
14:17 Tom_itx some are getting upwards of 200 ipm
14:17 rue_more 12Khz step rate to jog the table in 30 secs
14:17 fluffywolf I need to figure out how to drive my new mill... get a pcmcia parallel port and a chinese breakout board, or a usb pulse generator...
14:17 Tom_itx on plasma or lasers
14:17 Tom_itx fluffywolf, get a couple mesa cards and linuxcnc
14:17 rue_more fluffywolf, or, do the parallel-port-from-ide-cable trick
14:18 Tom_itx i had a working cnc and it was no comparison to this
14:18 fluffywolf Tom_itx: I plan on linuxcnc. I also plan on buying as little new as possible.
14:18 Tom_itx it takes a bit to get the parameters set up
14:18 Tom_itx that's fine
14:18 rue_more The backplane on the ide/parallel port is 8Mhz
14:19 Tom_itx i'm just saying if you want good stuff... those are excellent
14:19 fluffywolf although I still call it emc2. I think linux<function> is idiotic for software names.
14:19 Tom_itx the name change was due to a lawsuit
14:19 fluffywolf yes
14:19 rue_more who tried to sue who for what?
14:20 fluffywolf a lawsuit by a company founded AFTER emc2 was named, using a pun on a mathematical expression discovered way before that.
14:20 rue_more some people really are assholes
14:20 Tom_itx http://www.emc.com/index.htm
14:21 rue_more huh
14:23 rue_more what kinda things to people eat for lunch when at home?
14:23 Tom_itx sammich
14:23 Tom_itx soup
14:23 rue_more sounds thin
14:23 rue_more hmm
14:23 Tom_itx almost chili season
14:23 Tom_itx stew
14:24 rue_more hmm, k, toast and veggi soup
14:24 rue_more I'll try that
14:24 Tom_itx slap some cheese on the toast
14:24 Tom_itx make cheeze sammich
14:27 rue_more ooo
14:27 rue_more new trick,
14:27 rue_more put the toaster on its side, put the bread in witht eh cheese on top
14:28 rue_more grilled cheese toast
14:28 rue_more ok the image is downloaded
14:28 rue_more dodn't seem to ahve taken long for 1G
14:28 Tom_itx some have had trouble with the USB boot
14:28 fluffywolf google says linuxcnc and usb is still crap. bleh.
14:29 Tom_itx i said it didn't work
14:29 fluffywolf usb stepper pulse generators
14:32 fluffywolf some crap about usb's latency being too high to ever work without offloading all the realtime stuff to the device...
14:33 Tom_itx uh huh
14:34 fluffywolf ouch. mesa boards are EXPENSIVE.
14:35 Tom_itx which one did you look at?
14:35 fluffywolf I am fucking NOT spending three times what I spent on the mill on a tiny pcb!
14:35 fluffywolf ones with usb.
14:35 Tom_itx none of those work with linuxcnc
14:35 fluffywolf mesa's store says they do?
14:35 Tom_itx however they _are_ working on one that _does_ work with ethernet
14:35 Tom_itx they don't use the usb port
14:35 fluffywolf I clicked "linuxcnc supported boards".
14:36 Tom_itx the port is for firmware uploads iirc
14:36 Tom_itx or other applications
14:36 fluffywolf http://store.mesanet.com/index.php?route=product/product&path=83_85&product_id=72 is on the list that came back
14:37 Tom_itx all i got on that link was one card
14:37 Tom_itx the 7i61
14:37 Tom_itx which i haven't heard much about
14:37 Tom_itx i'm using a 7i43 fpga card with a 7i47 daughter card
14:37 Tom_itx the 43 is a parport interface to it
14:38 fluffywolf I'll be using a laptop, so the options are usb or pcmcia...
14:38 fluffywolf and if I get a pcmcia parallel port card, I'll just run it straight to the steppers.
14:38 Tom_itx with the 43 you get 2 50pin breakouts with 24? io on each one
14:38 Tom_itx yes you can do that
14:38 Tom_itx make sure it's a supported card
14:38 fluffywolf I'd much rather not tether the laptop with a parallel cable...
14:38 rue_more this is verry lunch looking
14:38 Tom_itx they have a list somewhere
14:39 Tom_itx also, most laptops won't work with linuxcnc
14:39 Tom_itx you need good latency numbers
14:39 Tom_itx generally speaking an old crapper pc is the best
14:39 m_itx peers over at
14:40 e_more is looking at his mini itx ba
14:40 Tom_itx what you need to do first is run the live cd and run a latency test on the board
14:40 fluffywolf well, it's going to be used with a laptop.
14:40 Tom_itx i got an atom D525 for mine
14:41 fluffywolf the mill lives under a tarp in the driveway, as I can't get it in my house. the control computer is not going to live under the tarp with it. I'm not going to lug a desktop in and out. plus, desktops use way too much power, so I'd only be able to use it while running and mill and not any other time.
14:42 rue_more my existing cnc uses dos, and being threadless, it has the whole 25Mhz of the processor available for operating the machine
14:43 fluffywolf my existing cnc is stuck with windows due to proprietary hardware... one of these days I might get some generic stepper drivers and switch it to linuxcnc.
14:43 Tom_itx the other cnc control i had uses a com port
14:43 rue_more as its software delay looops, I must never upgrade the machine..
14:43 Tom_itx but it was quite slow and very outdated
14:43 fluffywolf flashcut?
14:43 Tom_itx yes
14:43 fluffywolf flashcut can DIE. that's what mine uses...
14:43 Tom_itx i still have the control and driver box
14:43 fluffywolf ebay. they sell for $500.
14:43 Tom_itx really?
14:43 Tom_itx mine is very old
14:44 fluffywolf flashcut gives you a $500 tradein on any model, no matter how old or functional.
14:44 Tom_itx ver 1.4.1
14:44 Tom_itx tradein for what?
14:44 e_more looks ar
14:44 fluffywolf mine is ancient too, win95 software... and you can't use newer software because the software versions are tied to the hardware versions...
14:44 rue_more well I ate everything, does that mean I'm good to play?
14:44 fluffywolf discount on a new flashcut product
14:44 Tom_itx fluffywolf i know
14:44 Tom_itx well i'm not gonna use any more flashcut products now
14:45 rue_more how much re you paying after the $500 rebate?
14:45 Tom_itx i've got linuxcnc set up and i'm happy with it
14:45 Tom_itx alot
14:45 Tom_itx you can set linuxcnc up to run just about anything
14:45 fluffywolf yes, it's more a matter of time and money.
14:45 Tom_itx lathe, mill, laser, plasma, robotics.....
14:46 fluffywolf although flashcut has the advantage of easily connecting to my laptop with a single small cable and working.
14:46 Tom_itx yours must be quite a bit newer than mine
14:46 Tom_itx i tried using the drivers on linuxcnc and they were just too slow
14:47 fluffywolf I mean using their win95 software.
14:47 Tom_itx so i got some geckos
14:47 fluffywolf linuxcnc talks to the flashcut box?
14:47 Tom_itx no
14:47 Tom_itx the drivers
14:47 Tom_itx i tried wiring it to the driver box directly
14:47 fluffywolf the drivers are garbage too... my steppers are cold. I like my steppers hot.
14:47 Tom_itx it worked but it wasn't any better than what i already had
14:48 Tom_itx gecko makes your steppers run cool
14:48 Tom_itx they have 'smarts' in em for stuff like that
14:48 Tom_itx dsp
14:48 fluffywolf then your current limit and/or supply voltage are too low. :P
14:48 Tom_itx current shutdown etc
14:48 Tom_itx nope
14:48 Tom_itx i have the current throttled back to 3A right now
14:48 Tom_itx running 48v
14:48 fluffywolf I got some Centent cn0165s for my new mill... they're a predecessor to the gecko, and cheap on ebay, unlike geckos.
14:48 rue_more 2.6MB/s to the usb drive... zzzzzzzzzzzzzzzzzzz
14:49 Tom_itx i think the steppers would take 4A
14:49 fluffywolf mine are 9A. :)
14:49 Tom_itx some of the chinese ones are ok
14:49 fluffywolf (for my new mill)
14:49 Tom_itx i don't need 9A
14:50 fluffywolf these are US-made 10A drivers. centent is the gecko person before changing names.
14:50 Tom_itx i think my supply would support 6 or 7A though
14:50 fluffywolf I have 25A supply. :)
14:50 Tom_itx http://tom-itx.ddns01.com:81/~webpage/cnc/psu/psu_index.php
14:50 Tom_itx there's my new control
14:51 fluffywolf obviously I wouldn't use these same parts for my sherline... I think the steppers weigh a fair bit more than my entire sherline mill.
14:51 Tom_itx http://tom-itx.ddns01.com:81/~webpage/cnc/psu/control1.jpg
14:51 Tom_itx the mesa cards are in the back
14:51 Tom_itx the geckos are behind the heatsink on the door
14:52 Tom_itx most of that was surplus or used
14:52 Tom_itx save the drivers and mesa cards
14:52 fluffywolf shiny. I have a pile of Iota switching supplies, so will be using those, rather than building my own.
14:52 fluffywolf each one is 27V 25A, and they series or parallel.
14:52 Tom_itx the box was a commercial box ebay for like $25
14:52 fluffywolf so I could have 54V 50A if I needed it.
14:53 fluffywolf (I have four of them)
14:53 Tom_itx so get busy
14:53 fluffywolf out of money.
14:53 Tom_itx sell something
14:54 fluffywolf can't afford timing pulleys, belts, tooling to bore out the timing pulleys to match my mill, parallel port card, breakout board, or larger capacitors for the supply, among everything else I don't already have.
14:54 rue_more hmm _I_ have a lot of things, I could sell things!
14:54 Tom_itx http://tom-itx.ddns01.com:81/~webpage/cnc/psu/control7.jpg
14:54 Tom_itx that's after i added plugs for the steppers
14:54 fluffywolf all I have is the mill, the motors, the drivers, and pulleys for the motors. heh.
14:54 Tom_itx you can see my pendant there too
14:54 rue_more ooo wait, thats right, I'm in canada, I can sell them, but cant ship them
14:55 fluffywolf or the wire for the steppers, or the plugs...
14:55 fluffywolf interesting choice of plugs. I'm planning on powerpoles. :)
14:55 Tom_itx you can use alot of small caps instead of a couple big ones
14:55 fluffywolf yes, I can exchange time for money.
14:55 Tom_itx some were left over from the old control
14:56 fluffywolf I don't think I'd trust your plugs at the current my motors want.
14:56 Tom_itx probably not
14:56 Tom_itx there are others
14:56 fluffywolf powerpoles are cheap and come in shiny colors. :)
14:58 fluffywolf I need good realtime for threading...
14:58 fluffywolf do the ethernet ones manage this? I usually think of ethernet as slow and randomly latent.
15:00 fluffywolf if the spindle is running at 120rpm, and I'm threading 10tpi, each thread is only... bah, my brain is too tired to work out how many miliseconds wide a thread is. :)
15:23 rue_more Tom_itx, do you know if they ever made ISA cards?
15:24 rue_more ok linuxemc is written to a usb drive
15:24 rue_more I'm gonna go buy a level and some valves
15:25 rue_more and groveries
15:25 rue_more hmm what groceries do I need
15:31 peeps[work] if spectra/dyneema/UHMW is the strongest fiber in the world, why isn't the fiber used more in weaves etc, seems like carbon fiber gets all the fame
15:32 peeps[work] in composite/laminates
15:33 peeps[work] is it even more costly than CF?
15:35 rue_more ??
15:40 peeps[work] !!
16:00 fluffywolf from what I can find, my only option is parallel port... usb and ethernet are both quick hack tests and don't sound anywhere close to usable.
16:02 deshipu ok, this 3s lipo has total voltage of 0.43V, that won't work :P
16:02 fluffywolf it is now garbage.
16:02 deshipu toxic garbage \o/
16:02 shipu looks for a new
16:03 fluffywolf wire a mains plug to it, put it on a 100ft extension cord, place 100ft away, plug in?
16:04 fluffywolf then it can be toxic EXPLODED garbage. :P
16:05 deshipu it won't explode so nicely when it's discharged
16:06 deshipu also, cleaning that up :/
16:18 fluffywolf mmm, solar output 48A, batteries -109A... that means 157A into the inverter... yay running washer and microwave at once.
16:20 Wra|th^ hehe. do you run only on solar?
16:20 fluffywolf yes
16:21 Wra|th^ not bad
16:21 fluffywolf !units 157 amps 24 volts
16:21 Gigs fluffywolf:
16:21 Wra|th^ damn, my battery is showing red for the first time :S
16:21 Wra|th^ running a TV on my tiny little array was apparently not a good idea
16:22 fluffywolf !units 157 amps 24 volts watts
16:22 fluffywolf !units 157*amps*24*volts watts
16:22 fluffywolf bah
16:22 Gigs fluffywolf:
16:22 Gigs fluffywolf: Unknown unit 'amps24volts'
16:22 fluffywolf heh
16:22 fluffywolf I have ~2.5kW on the roof
16:22 fluffywolf !math 157*24
16:22 Gigs fluffywolf: 157*24 = 3768
16:22 Wra|th^ 130 watts here
16:22 fluffywolf !math 25*122
16:22 Gigs fluffywolf: 25*122 = 3050
16:22 Wra|th^ but this is only a cottage .. not a permanent place
16:23 Wra|th^ and a nice petrol generator :9
16:23 Wra|th^ )
16:23 fluffywolf I have a generator too... I avoid using it.
16:23 Wra|th^ same here, unless I have to..
16:23 Wra|th^ too expensive
16:25 Wra|th^ anyways, time to sign off for the night..
16:25 fluffywolf cyas
16:26 deshipu hmm, so rubber paint
16:27 deshipu anybody tried that stuff?
16:27 deshipu would it be suitable for painting the leg ends for better grip?
16:27 fluffywolf the stuff for stairs or the stuff for bondage? :P
16:27 deshipu they mostly show it on car wheels
16:27 deshipu the demo videos, at last
16:28 fluffywolf haven't seen that stuff.
16:28 fluffywolf I've seen rubber paint for applying to stairs so you don't slip, to tool handles, etc, and for applying to naked women... but not for car wheels. heh.
16:37 deshipu to women -- so that they are not so slippery?
16:46 fluffywolf dunno. I'm not one of those rubber fetish types. I've just seen it.
16:55 fluffywolf Tom_itx: thinking about ethernet has given me an idea... what if I do your solution and embed a single-board computer, and vnc to it? heh
17:00 deshipu fluffywolf: speaking of ethernet, have you seen https://github.com/cnlohr/ethertiny ?
22:17 rue_shop3 I tried a ceramic plant pot inteh smelter
22:17 rue_shop3 didn't even last 5 mins
22:19 RifRaf smelting aluminium ?
22:20 fluffywolf I've been tempted to try casting aluminum light fixtures, but that's a spare-time-and-money project...
22:27 rue_mohr2 RifRaf, didn't you know I been doing aluminum casting?
22:28 rue_mohr2 fluffywolf, keep your eyes open for an old diesel/oil heating furnace, you want the flame thrower out of it
22:28 rue_mohr2 erm, "burner"
22:28 fluffywolf all the ones I've seen here are of the wick or burn mat variety, no high pressure ones.
22:28 RifRaf rue_mohr2, nope, but was watching smelting the other night at the hackerspace, pretty cool
22:28 rue_mohr2 RifRaf, do well me about how and what they were doing
22:28 RifRaf they made some nice 50mm wide round bars for machining on lathe etc
22:29 rue_mohr2 haha, I did that yesterday
22:29 rue_mohr2 mainly as a test shape for the casting sand
22:29 fluffywolf monitors are popular, and use some fiberglass/something mat in the bottom of the burn pot with low-pressure fuel on it.
22:29 rue_mohr2 fluffywolf, na, just get a propane tiger torch then
22:30 RifRaf well they made a big fire in a metal bin that had fire cement about 60mm thick on the walls, with a hole at the bottom that a fan blew air into
22:30 rue_mohr2 yup
22:30 rue_mohr2 charcoal?
22:31 RifRaf just hardwood that i could see, they were using coal for heating up iron though
22:31 rue_mohr2 iiinteresting
22:31 rue_mohr2 a forced air wood fire could do it I suppose
22:31 RifRaf other were making stuff from steel, like blades and stuff
22:32 rue_mohr2 were they doing lost foam?
22:32 rue_mohr2 did they use casting sand?
22:32 RifRaf pretty cool place, think i might go there regular
22:32 RifRaf nope not yet, they were just making bars and ingots to machine with, think its still new
22:32 rue_mohr2 what did they pour into?
22:33 RifRaf well i did see some items made from lost pla that had been 3d printed
22:33 RifRaf stell containers, the bottom let go on one though, so nice aluminium patch on tar
22:34 rue_mohr2 hmm
22:34 RifRaf lost maybe kg of molten aluminium
22:34 rue_mohr2 like split steel moulds?
22:34 RifRaf i had to leave early though so didn't see it all, they hack away all night it seems but i had to work
22:35 Tom_itx RifRaf, how's the new job going?
22:35 RifRaf yes some long molds, some round ones, i'll know more in a week or 3, was talking too much and checking the rest of the place out to see the whole process
22:35 RifRaf Tom_itx, i am struggling, but hanging in there
22:35 Tom_itx are you programming or operating or both?
22:35 RifRaf only operating for first 2 weeks, still learning machine
22:36 RifRaf well i watch the operator most of the time, he is very switched on and has alot more experience than i
22:38 RifRaf start programming after next week, watching tutorials at moment, reading machine manuals etc, hopefully in a few weeks will have mastered the basics, very busy place
22:38 Tom_itx bigger than the last place?
22:38 RifRaf yep way bigger
22:39 RifRaf like 15 times the output
22:40 RifRaf is gonna either make me or break me, so tired after first week
22:41 Tom_itx workin your ass off ehh?
22:41 RifRaf yep indeed
22:41 Tom_itx some production shops are that way
22:41 Tom_itx they have alot more overhead to think about
22:43 RifRaf yep pretty crazy, but is good to be learning new stuff
22:43 Tom_itx always
22:44 Tom_itx it's what keeps us going
22:56 rue_mohr2 RifRaf, is it a 2d cutter or a 3d mill?
22:57 RifRaf mainly used as 2d cutter, but can do more
22:57 Tom_itx gnite
22:57 RifRaf cya
22:59 fluffywolf Tom_itx: what did you spend on your single-board computer? I'm thinking maybe I'll do your idea and use one, then vnc to it from my laptop.
23:00 Tom_itx maybe $300 with the case n all
23:00 Tom_itx i don't quite recall
23:00 Tom_itx that was with a ssd & dvd
23:01 Tom_itx those boards aren't available anymore but there are others that may work as well
23:01 fluffywolf a pcmcia parallel card seems like a kluge, and I found some negative reports about them...
23:01 Tom_itx you should ask in linuxcnc for more specific workable boards
23:01 Tom_itx alot of the new ones use pcie which mesa makes a card for
23:01 fluffywolf the mesa stuff is well out of my budget.
23:01 Tom_itx ok
23:02 Tom_itx just saying...
23:02 Tom_itx i think it's the 6i25
23:02 Tom_itx same specs as the 5i25 just pcie instead
23:03 fluffywolf it's also $109
23:03 Tom_itx i'm using mine with the onboard parport as the interface to the mesa cards in the control box
23:03 Tom_itx yeah and you'd need a daughter card to go with it
23:05 Tom_itx i configured my firmware so i have 2 sserial ports on it which would allow me to have several hundred IO if i needed it
23:05 Tom_itx i think i can configure it currently for 128 additional as it sits
23:05 Tom_itx or thereabouts
23:06 fluffywolf I need four step-direction pairs, limit switch inputs, e-stop input, and two high-speed inputs for spindle encoder
23:06 Tom_itx i've got a 7i71 & 7i84 sserial cards for that
23:07 Tom_itx the 7i43 would do that by itself but i'd want an isolation board between it and the drivers
23:07 Tom_itx that's kinda what the daughter cards do
23:07 Tom_itx as well as other functions
23:07 Tom_itx like the daughter card i have has RS422 differential serial
23:08 fluffywolf chinese parallel port breakouts with everything isolated are remarkably cheap. ($9)
23:08 Tom_itx i'm using that with the encoders
23:08 Tom_itx yeah
23:08 Tom_itx some guys make their own
23:09 Tom_itx the 7i43 gives you the fpga with higher step rates than you could ever get from a parport by itself
23:09 fluffywolf my stepper drivers have optos for the inputs, so I could do without double isolating everything, but more isolation is good as long as it doesn't hurt speed...
23:09 Tom_itx and can be firmware configured just about any way you need
23:09 rue_mohr2 optos can sometimes slow down max freq's
23:09 Tom_itx the 7i43 is a parport interface card
23:10 rue_mohr2 are they 4 or 6 pin optos? 8?
23:10 Tom_itx and relatively cheap for what it does
23:10 fluffywolf they're chinese.
23:10 fluffywolf I haven't looked into details.
23:17 rue_shop3 there is gonna be a storm
23:17 rue_shop3 and I dont have the genny fixed
23:18 rue_shop3 need to make a project list
23:18 rue_shop3 I should make an electronic project lister
23:18 rue_shop3 damn, its getting longer
23:18 RifRaf make a prawn peeler, i have 3kg left to do here :/
23:20 rue_shop3 hahaha
23:20 rue_shop3 some of your problems never go away
23:21 rue_shop3 you gonna bbq or jerky them?
23:23 rue_shop3 oh I just came up with an idea for a most awesome light for the shop
23:24 RifRaf bbq em later, family shindig this arvo/night
23:27 rue_shop3 RifRaf, if you had all the time of the night, and 3 robot arms, what do you think would be fun to do?
23:32 fluffywolf double penetration!
23:34 e_shop3 puts a wizard hat one fluffywolf and directs him to the special stool in the corner that faces the
23:35 GargantuaSauce finally someone i can see eye to eye with
23:36 RifRaf rue_house, automatic sheet loader/unloader for router maybe
23:36 rue_shop3 ooo
23:37 fluffywolf meh. not my fault intelligent, mature, sane, practical women who are good with a strapon are so hard to find...
23:37 RifRaf saw some pretty awesome ones on youtube the other day, 1 arm was feeding 2 machines
23:37 rue_shop3 these are small, about 8" reach
23:38 RifRaf pick and place machine?
23:39 RifRaf will think while i keep peeling..
23:39 fluffywolf GargantuaSauce: was that about what I said? heh
23:39 GargantuaSauce teledildonics is the wave of the future
23:40 rue_shop3 RifRaf, I dont think they have the accuracy
23:41 fluffywolf heh. nah, I'm happier having a woman physically located with me, rather than remote. I just like plain old non-tele dildonics. :P
23:41 rue_shop3 I swear, if you two weren't on topic with it...
23:42 GargantuaSauce finally got around to messing with my $5 gps modules
23:43 GargantuaSauce at least indoors, the resolved location wanders around like 50m
23:43 rue_shop3 hah
23:43 rue_shop3 is your house 50m big?
23:43 rue_shop3 want ot help me finish the indoor laser ranger?
23:43 rue_shop3 er,
23:43 rue_shop3 abs positioning system
23:44 GargantuaSauce i think vision SLAM is the way to go for that
23:44 GargantuaSauce will give quite accurate position+orientation once the map is built up
23:48 fluffywolf rue_shop3: something wrong with toys?