#robotics Logs
Apr 22 2012
#robotics Calendar
00:00 Tom_itx ok i got one for a 462
00:00 Tom_itx that may fit
00:00 rue_shop wonder if I use 2x5 ones from serial cables and glue off the last 2 pins
00:01 rue_shop think ribbon cable can take .75A ok?
00:01 Tom_itx guess you will find out huh?
00:01 Tom_itx i got lotsa 4 cond if you need more
00:01 rue_shop hmm 20awg
00:01 Tom_itx prolly a spool an a half by now
00:02 Tom_itx too bad they don't make thick ribbon
00:02 Tom_itx make wire looms alot nicer
00:04 Tom_itx ok, enough for one day.
00:04 Tom_itx gnite
00:05 Tom_itx oh, katsmeow-afk.. someone suggested i combine them before the diode pack
00:06 Tom_itx i'll see how it goes tomorrow
00:08 delinquentme so this thing is sitting still ... and im getting readings on the pot which are outside the normal +/- 2 when its idle
00:08 delinquentme this is with the micro attempting to move it but with insufficient power to do so
00:09 delinquentme so if its a pot transducing the position
00:10 delinquentme I'm guessing that the voltage 3.3 is bopping around
00:10 delinquentme the input voltage for the pot position transducing
00:11 delinquentme nm!
00:12 delinquentme ( the driver was unpowered ) :D
00:49 katsmeow-afk Tom, i designed and built for a living, the first psu i designed that went into a piece of FCC certified video equipment for tv stations was done in 1979, i gave you my best advice for the parameters you gave me
00:51 katsmeow-afk considering how much i would not want a single diode array charging 18,000ufd of capacitors, or dissipating 24 watts in normal operation, i stand by my advice to use two diode blocks
00:52 katsmeow-afk you have them, you do not have a current limited cold start circuit, use them
00:57 tsmeow-afk should just back away and let things happen as the
01:03 rue_shop heh
01:04 katsmeow-afk ?
01:04 rue_shop miscelanious io req'd on buddy3
01:04 rue_shop :
01:04 rue_shop 48 battery led outputs
01:04 rue_shop 6 overload reset outputs
01:04 rue_shop 6 overload alarm inputs
01:04 rue_shop 6 battery voltage inputs
01:04 rue_shop hmm
01:05 tsmeow-afk looks somewhat pa
01:05 rue_shop and I dont have to make 18 power jumpers
01:05 katsmeow-afk Tom might try to build a combo of all the advice he has been getting from all over, and it be contradictory and unworkable, and it burn his house down
01:06 rue_shop I have to make 18 power jumpers plus 30 signal jumpers
01:06 katsmeow-afk i haveto worry about Tom
01:06 rue_shop na, he'll be fine
01:07 katsmeow-afk you KNOW when i don't know something, i say so, right?
01:07 rue_shop yup
01:07 katsmeow-afk i am not giving Tom bad advice
01:08 theBear tom wouldn't burn his house down, he's like, MR awesome !
01:09 katsmeow-afk true, it's not best practice commercial practices, but then he doesn't have the budget etc to do professional engineering to power 3 stepper motors, it's also just not a difficcult thing to do
01:10 tsmeow-afk s
01:11 rue_shop I have to make the power inverter too
01:11 rue_shop 24V -> -24V @ 18A
01:11 rue_shop I have two big ferrite cores for it
01:13 rue_shop the inverter is also the cell balancer
01:13 rue_shop lots windings
01:13 katsmeow-afk you can do it, i put 10 windings on a microwave transformer
01:18 katsmeow-afk gnites then
01:25 rue_shop yea I have to go to bed, I cant get anything done yawning this much
01:25 rue_shop I just did a mockup of the battery clearances on buddy3, and YIKES its close
01:26 rue_shop I have all of 3cm to play with
01:26 delinquentme so some kind of motor powers this actuator
01:26 delinquentme is there an easy way to find out what kind?
01:27 delinquentme i guess without ripping it apart?
01:27 delinquentme basically it can be contracted / extended via hbridge ... and if its a stepper I could step it with the hbridge and completely do away w the additional controller
01:28 delinquentme BUT im not sure if the hbridge control is just 2 states ( extended or contracted ) or multiple anywhere along the stroke of the actuator
01:35 rue_shop its just a litle brushed dc motor dude
01:35 rue_shop will it run forwards/reverse hen you apply 5V?
01:40 delinquentme yeah
01:40 delinquentme thats exactly what it does all the way to end endstops
01:40 delinquentme so brushed dc motor ?
01:45 rue_house yea
01:45 rue_house want code to control the position?
01:46 rue_house It'll control 4 of them
01:46 rue_house it outputs pwm/dir to the driver
01:47 delinquentme 4 of what?
01:47 rue_house http://eds.dyndns.org/~ircjunk/robots/buddy_III/p1020058.jpg
01:47 rue_house I have 18 on my hexapod
01:47 delinquentme hehehe
01:47 delinquentme cute
01:48 rue_house the code controls 4 dc motors with potentiometer feedback
01:48 delinquentme ohhhh
01:48 rue_house serial interface
01:48 delinquentme hahah nah actually I just need to figure out if I can run this precisely without the controller
01:48 delinquentme and still have indy feedback
01:49 rue_house thats exactly what I just offered you
01:49 delinquentme I mean just within the unit I have
01:49 delinquentme this L16 actuator
01:49 rue_house your l16 actuators is a dc motor, a pot, and a screw
01:49 delinquentme correct
01:50 rue_house you need to use an avr to control the position
01:50 rue_house with an H bridge
01:50 delinquentme yeah so you've got hbridge code that controls a dc motor
01:50 delinquentme without use of the pot
01:51 rue_house and I just offered you avr code to control it
01:51 delinquentme bc that I could really REALLY use
01:51 delinquentme yeah
01:51 delinquentme id totally love to see that
01:51 delinquentme my apologies i misunderstood in my sleep stupor
01:51 rue_house uhu
01:53 rue_house http://eds.dyndns.org/~ircjunk/robots/buddy_III/servo32/adc_softpwm_P_uart/
01:54 rue_house I have PC side client code
01:57 rue_house http://eds.dyndns.org/~ircjunk/robots/buddy_III/servo32/adc_pwm_PI_uart2/
01:58 rue_house this is the latest
02:01 delinquentme cool
02:01 delinquentme got the link
02:01 rue_house read over main.c
02:02 delinquentme deal.
02:02 delinquentme alright im out!
02:07 rue_house he wont read it...
02:33 spacekitteh anyone know a good light-weight board which can run linux?
04:39 peepsalot anyone have experience with CFD?
06:33 rizlah Uh, anyone looked at the Navy Electricity and Electronics Training series? "The ability of the resistor to dissipate heat depends upon the design of the resistor itself. This ability to dissipate heat depends on the amount of surface area which is exposed to the air. A resistor designed to dissipate a large amount of heat must therefore have a large physical size. The heat dissipating capability of a resistor is measured in WATTS (this unit will be expl
06:33 rizlah ained later in chapter 3)."
06:33 rizlah Is that correct?
06:33 rizlah o.O
06:35 rizlah Ah FML think I read it wrong
06:45 Skwint I hope so
06:45 Skwint stupid Navy
06:45 Skwint if you want to teach a marine that you say "big ones don't get so hot so quick"
06:45 Skwint actually, if you want to teach me that would be a decent approach too
06:46 rizlah lol
06:46 rizlah I thought they were defining watts as the heat dissipating capacity of a resister
06:46 rizlah Was thinking WTF
06:46 rizlah But was my fail, read it wrong.
06:47 rizlah s/capacity/capability/
06:47 rizlah failing hard today.
06:47 Skwint the first two sentances both start with the same 9 words in the same sequence
06:47 Skwint actually, no, I'm failing as well
06:50 Squint In our defence, I reference the mouse over for http://xkcd.com/1028/
06:51 Squint whoever wrote that horrifying exposition on resistors is failing :p
06:55 rizlah hah
06:56 rizlah This seems OK, but not sure what I should actually be reading for a good all round learning resource for electronics
06:59 Skwint neither am I - it is one of those subjects that seems to have been intentionally obfuscated by its followers :/
07:00 Skwint this channel, when it responds, gives some of the clearest explanations I've seen yet :)
07:09 moriarty there is no obsfucation there unfortunately
07:09 moriarty a large surface area isn't necessarily the same thing as big ones
07:09 moriarty you may have a large volume with minimal surface area for a resistor, or you may have folds, for instance that increases the surface area
07:10 wint
07:10 Skwint but you said more in 2 sentances than they said in 4
07:10 moriarty sure, to highlight the lack of obsfucation by means of example
07:11 moriarty granted some textbooks are poor in explanation
07:12 moriarty i've had pretty bad lecturers on the topic too, but then i realise it's probably too easy for them so they assume that we should know the gaps they've left out
07:12 moriarty so i guess finding an appropriate text that meets one's requirements is just as crucial :)
07:13 Skwint OK, the difference between leaving key gaps in the explanation on purpose and by making a bad assumption matters I suppose
07:13 Skwint I should remove "intentionally" from my first sentance :p
07:13 moriarty good point
07:13 moriarty haha
07:39 rizlah In terms of electrical safety, what is the minimum voltage required to kill a person='
07:47 joink a voltage that goes towards zero
07:47 DanFrederiksen rizlah, depends on how it's applied and how long. people regularly get shocked by 230V mains which peaks around 330V
07:48 DanFrederiksen with no consequences. I'd guess you have to go up to 1000V or perhaps even higher to risk death
07:48 rizlah So there isn't like a golden rule of "touch this and you die"
07:48 DanFrederiksen or serious risk
07:48 rizlah 1000V seems a little high...
07:48 DanFrederiksen some might die from 100V if they are unlucky
07:48 DanFrederiksen rizlah, well people work on electric cars with 3-400V and I've never heard of a death from that
07:49 rizlah So it depends mainly on how well the body tolerates it, and how long it's applied
07:49 DanFrederiksen or even serious injury
07:49 DanFrederiksen but if applied at a particular location of the body very little could probably kill you
07:50 DanFrederiksen generally it has to get up to 30-36V before you can even feel it
07:50 DanFrederiksen so if you stick below that it should be quite safe
07:51 rizlah Ah, ok
07:51 DanFrederiksen not on the tungue though :)
07:51 DanFrederiksen even 9v will sting the tungue
07:52 DanFrederiksen tongue*
07:54 joink and if you risk getting the shock from inside the body/under the skin, all bets are off
07:55 joink like, sharp exposed points, etc
07:55 rizlah joink: All bets are off how, and why?
07:55 joink since you require much less voltage and current, as the body resistance is lower, to stop the heart
07:56 rizlah I see, why is there a difference in resistance between above/under skin?
07:57 joink eeh.. since the skin has a higher resistance...
07:58 Squint it's mostly a question of how much current flows through the heart
07:58 Squint so it depends where you get hit and how well earthed you are
07:59 Squint mythbusters did an experiment with a dummy holding a phone in a thunderstorm and concluded that it was at risk from induced current
08:00 Squint "The voltage of an electric fence should vary from about 2000 to about 10,000 volts. A 10,000 volt output is the maximum voltage allowed by international regulations"
08:01 rizlah 10k volts would hurt, no? xD
08:01 Squint they do hurt, yes, rather a lot, but I've seen people hold them without a shock atall while wearing rubber boots
08:02 Squint I've also seen people test them, conclude they were off, and get half way through climbing over before learning that they run in pulses, not continuously :)
08:02 rizlah hah
08:02 joink and then we have drunk people, pissing on them :P
08:03 joink usually only once in their life time
08:03 Squint mythbusters did that too, and they didn't use dummies :)
08:03 Squint youtube has to have that episode!
08:03 joink probably, I've seen the one where they tried to piss on the third rail or something
08:03 joink was probably in the same episode
08:09 Triffid_Hunter rizlah: basically if you can put 5mA through the heart, you risk fibrillation which leads to death if not dealt with very quickly
08:10 Triffid_Hunter rizlah: so 240v mains may not do much if the circuit is hand-to-foot, but if it's hand-to-hand you're at far more risk. also, skin has quite a high electrical resistance (10-200k) but the meat beneath it is highly conductive, mostly via ionic conduction rather than electron movement
08:11 Triffid_Hunter rizlah: upshot is, 12v won't do a damn thing if you touch it with your skin, but if you have cuts on both thumbs and drop them on a 12v battery you risk fibrillation
08:11 Triffid_Hunter rizlah: so the risk of death is all about "how much current goes through your heart"
08:12 joink Triffid_Hunter: thank you for a nice writeup :)
08:13 Triffid_Hunter joink: heh yw
08:13 joink now, let's hope rizlah doesn't die from electrocution :)
08:14 Triffid_Hunter for those that don't already know, fibrillation != stopped heart, fibrillation is when the muscles get out of sync so they're still pulsing but the rhythm is wrong and blood no longer gets pumped
08:14 Squint I'm worried that he asked the minimum to kill a person, not the amount that might kill him
08:15 Squint so I don't think he's the one at risk of dying from electrocution :p
08:17 rizlah Interesting answer :D, good to hear a proper explanation
09:43 delinquentme ok so when I first upload a sketch ... the actuator extends all the way out and the pot reading = 0 ( awesome )
09:44 delinquentme it then contracts fully and gives pot reading = 1023
09:44 delinquentme ( double awesome )
09:44 delinquentme then it extends again and pot reading now = 586
10:00 Tom_itx spacekitteh sure do
10:00 Tom_itx pc104
10:01 Tom_itx ok katsmeow-afk
10:01 Tom_itx i will likely take your advice however i was just thinking out loud last night
10:02 Tom_itx the other guy that suggested combining the xfmrs before the diode packs also does audio design and winds his own torroids for the industry
10:02 Tom_itx so i'm kinda caught in the middle
10:02 Tom_itx if it were a big deal doing it one way or the other someone would have suggested that by now
10:03 Tom_itx i'm thinking it's not a huge issue either way at this point
10:03 Tom_itx i'm leaning toward your advice though
10:03 saschi sound's nice
10:04 Tom_itx as a precaution ( i realize it probably doesn't matter ) should i try to get the phases aligned before the diode packs on each pack and then combine the dc out?
10:04 Tom_itx by the other side of the packs it probably makes no difference at all
10:04 Tom_itx saschi me?
10:05 Tom_itx this is a fairly large power supply i'm making
10:05 saschi for welding purpose?
10:06 Tom_itx no
10:06 Tom_itx to drive steppers on a small mill
10:06 Tom_itx the psu will be way overkill for the job but i'm building for expansion
10:07 Tom_itx the current supply is 24v i think 24 or 28
10:07 Tom_itx at about 3A
10:07 Tom_itx this will be about 53v 18A
10:07 Tom_itx i hope
10:11 Tom_itx http://tom-itx.dyndns.org:81/~webpage/temp/cnc/psu1.jpg
10:11 Tom_itx 3 of those
10:34 saschi cool
12:01 rue_house Tom_itx, your gonna scratch up your clad!
12:01 rue_house why are you using a linear supply for steppers?
12:02 rue_house computer spu's put out 12V at like 20A
12:02 e_house goes for sh
12:05 Tom_itx because i have it
12:05 Tom_itx i want alot more voltage than 12v
12:18 Tom_itx rue_house here's a problem: 2.7" circle need to space points evenly .299 apart. how many degrees apart are they?
12:18 Tom_itx so the arc len is .299
12:18 Tom_itx i think
12:33 katsmeow-afk Tom, how many holes?
12:33 katsmeow-afk 360 / hole_count
12:34 Tom_itx well is 30 enough?
12:34 Tom_itx need the center diameter for them so they're .064" from the edge of a 3" circle
12:35 Tom_itx 12deg for 30
12:35 katsmeow-afk if 30 is what fit, it is what will be, simple
12:36 katsmeow-afk er, you do not have identical diode packs
12:37 Tom_itx yes i do
12:37 katsmeow-afk not in psu1.jpg
12:37 Tom_itx nope
12:37 katsmeow-afk k
12:39 rue_house Tom_itx, what votlage do you want?
12:39 rue_house you can gang two computer power supplies to make 24V
12:40 Tom_itx 50-75v
12:40 rue_house you just have to cut the ground link off the secondary
12:40 rue_house 50!
12:40 rue_house hmm
12:41 rue_house at 3A?
12:41 Tom_itx 18
12:41 rue_house 18A!?
12:41 katsmeow-afk the 50vdc gets the current started into the motor inductances real fast
12:41 rue_house 1000W supply!
12:42 Tom_itx between 50 and 80 as the absolute upper limit
12:42 Tom_itx i gotta double check what the motor windings are rated for
12:42 rue_house I suggest putting away your transforers and getting a 240V:120V transformer it'll step the 120V down to 60
12:43 Tom_itx but i got these
12:43 Tom_itx it's a 'rue' project.... free
12:43 Tom_itx ya know?
12:43 rue_house a large HID ballast might do it
12:43 rue_house ok
12:43 rue_house you know how many va those are tho?
12:43 Tom_itx 37.4 vac
12:43 Tom_itx 6A ea
12:44 rue_house mhm
12:44 Tom_itx it's more than i need
12:44 rue_house no
12:44 Tom_itx i may start with 2
12:44 rue_house you want 18A
12:44 Tom_itx for 12A
12:44 rue_house no, you want 50V
12:44 rue_house thats just 37
12:44 katsmeow-afk i hasto take a water filter back to store, the o-ring is 1/2 inch too big to go intot he slot, and to fat to pound into the narrow slot
12:44 Tom_itx dc is 53v
12:45 Tom_itx i checked it
12:45 Tom_itx and did math
12:45 katsmeow-afk bbl
12:45 rue_house ah yes ok
12:45 Tom_itx katsmeow-afk
12:45 Tom_itx don't leave just yet
12:45 e_house th
12:45 Tom_itx gonna post a pic
12:45 rue_house you would have to gang 4 computer power supplies, and rewind the cores
12:45 rue_house hmm
12:46 rue_house too bad tom, I have 2 24V 30A supplies with isolated outputs from a sign system
12:46 rue_house or a industral rack of some kind
12:47 rue_house a big telco power suplly is what you want
12:48 rue_house 48V
12:48 katsmeow-afk ?
12:48 katsmeow-afk Tom ?
12:49 Tom_itx ok 26 seems to work best for your criteria
12:49 Tom_itx will post in a sec
12:49 rue_house its too bad it has to be isolated fraom the main,s a 2:1 autotransformer would be tiny
12:50 tsmeow-afk pictures Tom driving a fence post thru a PIC16
12:50 katsmeow-afk i thought 30 worked well, it made a circle 2.8" dia
12:51 rue_house 24V 30A = 48 24 12 720W
12:51 katsmeow-afk or is that too close to the 3" perimeter?
12:51 Tom_itx it puts them too close i think
12:51 Tom_itx yes
12:51 rue_house wow, bigger than my mill supply
12:51 rue_house and it weighs about 80lbs
12:51 katsmeow-afk ok, don't want the fr4 shattering, falling apart, breaking out, etc
12:52 katsmeow-afk you really may need to sneak up on the 6mm, like drill a 5mm first? i dunno how your mill is
12:52 tsmeow-afk leaves that up to
12:52 rue_house kat, whats a large mot rated for?
12:53 rue_house 900?
12:53 katsmeow-afk the largest : 900w
12:53 rue_house and tom wants 1000
12:53 rue_house eeek
12:53 Tom_itx http://tom-itx.dyndns.org:81/~webpage/kat/hub.jpg
12:54 katsmeow-afk seems rule of thumb is ~ 90w/lb
12:54 Tom_itx the 6 holes are the 4-40 screw and head
12:54 rue_house Tom_itx, how much to those transformers weigh?
12:55 Tom_itx oh i'd guess about 5lb or so
12:55 Tom_itx i can weigh one if you really need that
12:55 rue_house ~450W
12:55 katsmeow-afk real xformers != nukebox xfromers
12:55 rue_house hmmm
12:56 Tom_itx based on the size of the original transformer i think these 3 combined will do just fine
12:56 Tom_itx the original is about 1/3 the size of one of these
12:56 katsmeow-afk i don't think Tom will have all 3 motors running all the time
12:56 Tom_itx not likely
12:57 katsmeow-afk at most, i expect 2 running at most 80% of the time that any is running
12:57 rue_house is it not for a cnc machine?
12:57 Tom_itx yes
12:57 Tom_itx you've seen it many times
12:57 katsmeow-afk yeas, so z-axis won't be running much at all
12:57 Tom_itx unless i'm doing surfaces
12:57 Tom_itx which i don't do much
12:57 katsmeow-afk true
12:58 Tom_itx also i may eventually add a 4th axis
12:58 katsmeow-afk Tom, those holes look really close
12:58 Tom_itx the holes are the max you said
12:58 Tom_itx .235? plus the tolerance between them
12:58 katsmeow-afk 4? then by all means, don't scrimp now, or you'll be rebuilding it later
12:58 Tom_itx so they actually should touch to be perfect
12:58 katsmeow-afk the hole includes the space tween them?
12:58 Tom_itx yes
12:58 katsmeow-afk ah
12:59 Tom_itx easier to calculate it that way
12:59 Tom_itx the centers are still right
12:59 katsmeow-afk but you'll drill them the .235 or 6mm
12:59 katsmeow-afk ok
12:59 Tom_itx except maybe the hole to 3" may be off
12:59 Tom_itx i can put any tool i choose in the machine :)
12:59 katsmeow-afk the disk OD isn't critical
13:00 Tom_itx i can make 30 holes if you prefer and make the disk bigger
13:00 katsmeow-afk what's critical is all the stuff i cannot do atm: the roundness of holes, the hub, the squareness of axle to disc, etc
13:00 Tom_itx i'll revise that and show you
13:00 katsmeow-afk umm,, how many holes in that pic?
13:01 tsmeow-afk moves i to FF cause of IE's carpy pic rend
13:01 katsmeow-afk 26
13:02 katsmeow-afk 26 at 3" dia? lets keep it there
13:03 Tom_itx ok
13:03 katsmeow-afk if this works, i don't wanna go over 3", and you have it all done already, lets stay with it
13:04 Tom_itx what was your hole size again?
13:04 Tom_itx 235?
13:04 tsmeow-afk
13:04 katsmeow-afk that gives me a .0005 press
13:04 Tom_itx the distance to the edge will be more than .064 then
13:04 katsmeow-afk or, space to remove fiberglass burrs
13:04 Tom_itx i had the tolerance built in when i moved those :(
13:05 Tom_itx i'll fix it
13:05 Tom_itx but that may add some holes to it
13:05 katsmeow-afk no prob, we already discussed it
13:05 Tom_itx or would you rather have a little more beef at the edge?
13:05 Tom_itx it's only a few thou
13:05 katsmeow-afk i calc the centerline of the holes to be a 2.8 circle, so that's under 0.1 tot he edge, which is ok
13:05 Tom_itx .0535
13:06 Tom_itx plus the .064"
13:06 Tom_itx to the edge
13:06 katsmeow-afk <blink>
13:06 Tom_itx ok?
13:06 Tom_itx or not?
13:07 katsmeow-afk not sure we are talking the same thing
13:07 Tom_itx .1175" to the edge
13:07 Tom_itx to the .235" hole diameter
13:07 Tom_itx i screwed up
13:08 katsmeow-afk 30 holes line up on a 2.855 circle, plus 1/2 the hole dia in each dir = 3.090 disc, there's no ,, oh wait, you drew 26 holes........... /me recaluclates
13:08 Tom_itx i can put any number of holes
13:09 Tom_itx but when i did the circle, i messed up and got them further from the edge than spec called out
13:09 Tom_itx by .0535"
13:10 katsmeow-afk ok, 26 is 2.475, + .235 = 2.709 , ,, 0.145 rim
13:11 home hey XD
13:11 katsmeow-afk 28 is 2.665, + .235 = 2.9 , .050 rim
13:12 Tom_itx that's out of spec
13:12 katsmeow-afk can you do 28 holes 12.857142857142857142857142857143 degrees apart?
13:12 Tom_itx by .014"
13:12 Tom_itx sure can
13:12 Tom_itx on what workplane? :)
13:13 katsmeow-afk nah, i said the rim and spacing can be .050, i am concerned about the glass shattering, if your mill can drill the holes that close, all the better!
13:13 Tom_itx guess we will see huh?
13:13 katsmeow-afk well, i know my drill presses cannot do it well
13:13 Tom_itx so what's the center diameter of the holes you just calculated?
13:13 Tom_itx 2.665?
13:14 katsmeow-afk ( 28 * .299 ) / pi = 2.665
13:14 katsmeow-afk so the holes are on a 2.665 dia circle
13:15 katsmeow-afk but the holes are only .235, so they don't touch when drilled, and the OD of the ring of holes is 2.900
13:15 katsmeow-afk the disk being 3, that's .050 from the holes' Od to the disc OD
13:16 katsmeow-afk works out real nice :-)
13:16 Tom_itx i'll post that
13:18 Tom_itx refresh
13:18 Tom_itx the red is the .235 hole the yellow is the .064 tolerance
13:19 katsmeow-afk umm,,, is the yellow .064 all the way around the red, or .032 around the red?
13:20 Tom_itx .032 from each red circle
13:20 Tom_itx so .064 for 2
13:20 katsmeow-afk if it's .064 around, then there's .108 tween the holes
13:20 Tom_itx the spacing is ok
13:20 katsmeow-afk ok
13:20 katsmeow-afk pretty :-)
13:20 katsmeow-afk i have a question
13:21 m_itx submits a request for signoff on the pro
13:21 Tom_itx i don't have a 1/4" bearing to make the shaft fit
13:21 Tom_itx haven't found one yet
13:21 Tom_itx it's possible you may have to emery that a bit
13:21 katsmeow-afk for anotehr disk, can you make slots at the same degrees apart?, maybe 0.5 deep?
13:22 Tom_itx what slots?
13:22 katsmeow-afk .064
13:22 katsmeow-afk on *another disk*
13:22 Tom_itx i know
13:22 katsmeow-afk same degree spacing
13:23 katsmeow-afk where the holes are on the prototype, make a disk with a slot for each hole
13:23 katsmeow-afk i can insert pcb and make a winding jig
13:23 katsmeow-afk but if you cannot, ic an do that, because it's not critical
13:24 Tom_itx oh, make the same thing but break thru the edge?
13:24 Tom_itx with a slot for the wire?
13:24 katsmeow-afk nono
13:24 Tom_itx hmm
13:24 katsmeow-afk a slot for a tab to make the winding jig
13:24 katsmeow-afk not a lsot for wire
13:24 katsmeow-afk nvm
13:25 katsmeow-afk i can make it
13:25 Tom_itx i can too if i know what it is :)
13:26 katsmeow-afk see where you have holes 12.xx apart? on anotehr disc, make .064 wide breakout slots in same position
13:26 Tom_itx instead of the holes?
13:26 katsmeow-afk instead of holes
13:26 Tom_itx not sure my mills will take that
13:26 Tom_itx i hate milling fr4
13:27 Tom_itx they'd have to be .064 wide?
13:27 katsmeow-afk no prob, it's only a matter of a few minutes on bandsaw
13:27 katsmeow-afk i can do it
13:27 Tom_itx i can put spot drills to locate them for you
13:27 katsmeow-afk that would be good
13:27 Tom_itx just a flat disc with dimples in it
13:27 katsmeow-afk just dink the degrees, and i can draw lines
13:28 katsmeow-afk yeas
13:28 Tom_itx ok what about the center hole on those?
13:28 Tom_itx same or leave it out?
13:28 katsmeow-afk if you can, just in case
13:29 katsmeow-afk it would make a fine locator ref hole
13:34 tsmeow-afk need to go return that filter and bad o-
13:45 rue_house wow its amazing what some people think they can sell things for on ebay
13:52 Tom_itx rue_house so what's your take on combining those transformers?
13:55 rue_house go for it
13:57 Tom_itx no, where to join them... before or after the diode packs
14:00 rue_house $86 for a exhaust manifold for the truck (clearance) should I get it or keep trying to weld mine?
14:00 Tom_itx keep welding
14:00 rue_house Tom_itx, dont, split them out to the loads
14:01 rue_house http://www.ebay.ca/itm/Chevy-S10-Blazer-GMC-S15-Jimmy-2-5-2-5L-Dorman-Exhaust-Manifold-1985-1993-/150799253848?pt=Motors_Car_Truck_Parts_Accessories&hash=item231c560158
14:01 e_house looks at the shiney exhaust mani
14:01 rue_house its the origional design tho, so it'd prolly get a few years and crack
14:02 rue_house http://www.ebay.ca/itm/2-5-S-10-CHEVY-85-87-88-89-90-91-92-93-EXHAUST-MAN-/260998254798?pt=Motors_Car_Truck_Parts_Accessories&hash=item3cc4b550ce
14:02 rue_house oo the proper fast ones is.... more exponsive
14:03 rue_house ah, but it looks like it needs an adapter kit
14:03 rue_house 90% of the maintenance on that truck is directly related to the engine
14:04 rue_house converting it to electric will half the cost of the damn thing
14:04 Tom_itx i found i had to do little maintenance on mine
14:04 Tom_itx will that offset the useable life of the truck?
14:04 Tom_itx before it rusts out
14:05 Tom_itx i had to fix the body mounts once on mine
14:05 rue_house its got almost no rust
14:05 Tom_itx check the rubber grommets on the body mounts
14:05 Tom_itx mine rusted thru there
14:05 Tom_itx started riding rather rough so i checked em
14:06 rue_house box and cab?
14:06 Tom_itx cab anyway
14:08 rue_house there is a squeek that seems to be realted to the right front wheel when braking or under rough ride, I havn't found it yet
14:08 rue_house I think I'm gonna have to upgrade it to 15" wheels, I'm told the 14" are almost impossable to get
14:38 tsmeow-afk hath retur
14:40 katsmeow-afk changing the tires will throw off the torque and speedo
14:41 tsmeow-afk sits and rests a
14:44 katsmeow-afk 22 April 2012 Last updated at 01:41
14:44 katsmeow-afk US introduces $60 LED light bulb
14:44 katsmeow-afk Made by Dutch electronics giant Philips
14:45 Steffanx Uh? That's new?
14:45 katsmeow-afk From 2014, incandescent bulbs of 40 watts or above will be banned in the US.
14:46 katsmeow-afk not new, but i wonder how the usa is introducing it, when it's made in Europe by a Dutch company
14:46 katsmeow-afk plus, it's $60, you can get them for half that on ebay
14:48 Steffanx Here, in Europe, it's forbidden to make incandescent bulbs after the first of september this year, katsmeow-afk
14:48 Steffanx So i guess i have to buy lots of them before the first of sept.
14:49 tsmeow-afk
14:49 katsmeow-afk all of my lites are already miniflourescent
14:50 Steffanx I still prefer the good old bulbs :)
14:54 katsmeow-afk "China very recently launched its own Beidou Positioning System, challenging the monopoly of the US Global Positioning System (GPS)" nevermind EU's version of the gps
15:13 rizlah Steffanx: Why?
15:19 Steffanx I think I like the light of it more rizlah
15:19 dunz0r I like LED-bulbs. All of my bulbs at home are LED except for the oven light.
15:21 rizlah I mean why will it be forbidden?
15:22 katsmeow-afk inefficency
15:22 Steffanx Yeah, EU crap
15:22 Steffanx I said Europe, but I meant EU :)
15:24 dunz0r Apart from lighting up at a building site, I don't really see a need for anything above 40W bulbs.
15:25 dunz0r And damn the manufacturers for measuring light strength in watts in the first place.
15:25 dunz0r Should've been lumen. Finding a LED-light which is "like a 25W" or something is tricky.
15:25 Steffanx All my incandescent bulbs here are 60W
15:25 Steffanx Except the one on my desk
15:26 dunz0r I think 60W is too much. Hurts my eyes and what not.
15:27 Steffanx Actually, I have only one 60W bulb here :P
15:27 Steffanx 60W hurts your eyes :S
15:29 Steffanx I guess the 60W incandescent bulbs in Sweden aren't the same as the bulbs here :P
15:30 katsmeow-afk can't get any 60w here except the frosted diffused ones
15:31 dunz0r Steffanx: I'm sensitive to harsh light though. I don't think I'm a good representation of swedens population :)
22:25 rue_house well I have about an hour left
22:26 rue_house sigh
22:29 tsmeow-afk gives rue one of her unused h
22:30 katsmeow-afk i has a robot question for you rue
22:30 katsmeow-afk does it matter what kinda actuator pulls on a finger to make it grasp, as long as it works as well as a human finger actuator?
22:35 katsmeow-afk http://www.allelectronics.com/make-a-store/item/GR-86/4-GEAR-SET/1.html
22:35 katsmeow-afk http://www.allelectronics.com/make-a-store/item/GR-5/SET-OF-5-GEARS-AND-BUSHINGS/1.html
22:38 katsmeow-afk http://www.alltronics.com/cgi-bin/item/28Z214/search/Assortment-of-11-Compatible-Plastic-Gears
22:38 katsmeow-afk http://www.alltronics.com/cgi-bin/item/28Z232/search/Assortment-of-50-Compatible-Plastic-Gears
22:44 katsmeow-afk all those are cheaper on ebay, but much longer shipping times
22:45 delinquentme http://www.festo.com/cms/nl-be_be/16306_16336.htm#id_16336
22:45 delinquentme almost not real
22:46 delinquentme also the gripper design is brilliant
22:46 katsmeow-afk http://stores.ebay.com/ce10wy/_i.html?_nkw=gear&_sid=1022220940
22:53 Tom_itx ok the transformers are at least mounted to a plate
22:53 Tom_itx no pics tonight
23:11 katsmeow-afk http://www.knex.com/Shop/site_search_portal.php?func=1&words=gear
23:39 katsmeow-afk http://stores.ebay.com/HopMeUp/_i.html?_nkw=gear&_sid=179995618
23:43 delinquentme katsmeow-afk,
23:43 delinquentme did i show you
23:44 delinquentme http://techcrunch.com/2010/02/01/festo-ifab-in-action-ooooh-baby/
23:44 delinquentme delta additive printer
23:44 delinquentme so so so sooo beautiful
23:48 katsmeow-afk saw it
23:51 rue_house !assist circuits
23:51 tobbor Possibly http://eds.dyndns.org/~ircjunk/circuits
23:52 delinquentme isnt it the prettiest thing you've ever seen
23:52 delinquentme @_@
23:53 delinquentme so lovely !