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Must resist: http://www.sparkfun.com/products/10351
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andypugh don't buy floor sweepings
I just bought 3 more organizer drawer units
pfred1, do you have a schematic of your stepper driver you made?
WillenCMD yeah but it isn't worth building
you can buy a chinese board cheaper
there is a new toshiba chip out now that looks even cooler
[00:19:32] <pfred1> http://simewang007.en.ec21.com/Toshiba_Thb6064ah_Engraver_Machine_Step--5804224_5887880.html
thing is a hawt rod!
4.5 a output current 50 V
[00:21:01] * pfred1 wants!
i kind of want to experiment with stepper timing/encoder feedback via a microcontroller so i want to through together a basic mosfet drive circuit
WillenCMD but if you want to check my drivers out for laughs you can see them here http://www.instructables.com/id/TB6560-Microstepping-Bipolar-Chopper-Stepper-Motor/
ah then you want something like an http://www.spickles.org/projects/lmd18200/
BTW don't believe that page those chips are pretty expensive as far as chips go
they have 4,000 mosfets in them though
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so I guess if you break it down that way then they're pretty cheap
neat how they do current control they sense 2 mosfets
then figure the other 3,998 are doing basically the same thing
WillenCMD I think the LMD18200 is the hot tamalie when it comes to mosfet H bridges
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drilling holes for pillow blocks is a pain in the ass
i can never get them perfect
i broke 6 taps, driling holes for all the linear rails in the very first machine i designed
tapping holes i should say not drilling
it was 1.25 precision ground 1018 stock, and i couldn't get the right chip to come off.
finally with due process i tweaked the speeds switched to peck tapping and found the sweet spot
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I normally use a cordless drill :-)
i just took a ink pad and pushed a pillow block on it then onto a index card :)
lol cordless drill through 1.25 steel plate?
a black and decker could do that
Depends on the tap size
but 36 holes
1 beer per hole
Though it makes no sense to tap full-depth
i like that method
then in the end when its all fucked up your too drunk to care
yeah, it would of been alot more fun milling out broken taps also
I <3 my Ryobi LiIon drill. It cheerfully pushes a 55mm holesaw through 5mm of steel, then the same battery in the circular saw can cut through 6" of 1" aluminium bar. And still show amber on the charge indicator.
was it free also?
No, in fact he battery alone is $100
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all the batteries are 100
no matter the brand
thats why i use earth batteries and solar pannels, with an hho genartor
kidding of course
i did have some interesting experience's with hho in my beginning years of electronics
including a really nice explosion in the guest bedroom
is that where your penis went?
hho? You don't mean hhoo?
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no my wife took my penis way before that
along with my man card
its not that bad though, i don't have to make any of my own decision's anymore, and its not as sweaty in the groin region
atleast you still have your ghetto pass and street cred
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im ready for winter
i don't feel so bad sitting inside working on projects :)
I know that if you are going to apologise before posting something, you probably shouldn't but I can;t resist:
An Englishman, a Scotsman, an Irishman, a Welshman, a Latvian, a Turk, a German, an Indian, several Americans (including an Hawaiian and an Alaskan), an Argentinean, a Dane, an Australian, a Slovak, an Egyptian, a Japanese, a Moroccan, a Frenchman, a New Zealander, a Spaniard, a Russian, a Guatemalan, a Colombian, a Pakistani, a Malaysian, a Croatian, a Uzbek, a Cypriot, a Pole, a Lithuanian, a Chinese, a Tibetan, a Sr
Lankan, a Lebanese, a Cayman Islander, a Ugandan, a Vietnamese, a Korean, a Kenyan, a Uruguayan, a Czech, an Icelander, a Mexican, a Finn, a Honduran, a Panamanian, an Andorran, a Moroccan, an Israeli, a Palestinian, a Venezuelan, an Iranian, a Fijian, a Peruvian, an Estonian, a Syrian, a Brazilian, a Portuguese, a Liechtensteiner, a Mongolian, a Hungarian, a Canadian, a Moldovan, a Haitian, a Norfolk Islander, a Macedon
a Bolivian, a Cook Islander, a Tajikistani, a Samoan, an Armenian, an Aruban, an Albanian, a Greenlander, a Micronesian, a Virgin Islander, a Georgian, a Bahamian, a Belarusian, a Cuban, a Tongan, a Cambodian, a Manxman, a Qatari, an Azerbaijani, a Romanian, a Chilean, a Jamaican, a Filipino, a Ukrainian, a Dutchman, an Ecuadorian, a Costa Rican, a Swede, a Bulgarian, a Serb, a Swiss, a Greek, a Belgian, a Singaporean, a
Italian and a Norwegian all walk into a very fine restaurant.
“I’m sorry,” says the maître d’, after scrutinizing the group. “You can’t come in here without a Thai.”
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andypugh: You think it's possible to use 3/4" of travel from my 1" tavel on cylinder to somehow engage the bottom plate (below the belleville washers) so that the quill can be used?
I only need 1/4" travel to compress the washers..
I am not entirely clear on the question.
Can you mount the cylinder to the quill and make the question moot?
[01:50:10] * Tom_itx wonders if andypugh was loading the ark or just what
okay. Most designs I've seen.. use a plate under the belleville so that when to cylinder compresses against the draw bar, it lifts the plate and thus pinches the washers closed.. problem is.. the plate would prevent the quill from being able to lower.
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I was thinking of using something like a keyhole looking plate that in one position, is small enough to trap the washers.. in the other, would allow clearance for them.
Instead of using a extra device like a solenoid etc to engage that plate.. I was thinking of some way to use the extra travel of the cylinder before it reaches the top of the draw bar.
Not sure about mounting the cylinder to the quill...
Yes, I think you could use a spring on the plunger to the plate so that the first motion somehow scissored the plate round the underside of the pinch disc thingy.
Actually, a keyhole-shaped hole is probably what is required
Plan B would be for quill-motion to disengage the plate.
A simple lever operated by the top of the quill could slide the keyhole plate accross.
And maybe I'm nuts for wanting to maintain the quill...
we used to have a quill
we don't miss it
I was thinking of maybe a wedge shaped design that as the plunger went down for the first 3/4" it would cam the keyhole plate into place.
What's the most efficient way to convert vertical force to a horizontal force?
djdelorie: On #sparkfun: Shadyman: I'll still have to hunt down a gEDA CC license logo and an OSHW logo
i would be happy to supply you with gears if needed
easy enough to convert logos using psedit
I have a geda logo for geda already though
but you have to regenerate it for each size you want
djdelorie, are you the guy that had those purple pcbs made?
which "those" pcbs?
it was someone here
WillenCMD: How do you figure a Worm gear can convert vertical force to horizontal ? no rotation involved...
some motor controller pcb
yup, those are mine
and they had that cheap place that makes em
what was that site again big guy?
[02:08:39] <djdelorie> http://www.delorie.com/pcb/geda-logo.eps
well the site that made em
see it used on the back-side image of http://www.delorie.com/electronics/rulz/
ReadError: see http://www.delorie.com/photos/cnc/
it was the guy with the big wooden cnc
is that you?
google for "dorkbot pcb"
my memory fades me
andypugh: should I join #sparkfun or is that all you need? ;-)
ahh yes thats the site
You could just /join, give a link, and run away
heh i've done that :)
what do we think of belt driven cnc routers
i can't seem to find any hard data on belt elongation under load
If I was building one, it would be belt driven
on paper belts are incredible except for elongation and cyclical motion at velocity changes
Ah, well, but, yoiu see, I would steal the brilliant Bell-Everman idea.
but again i haven't seen any real data on that, or any good anecdotes
[02:16:12] <andypugh> http://youtu.be/OdJoVh6DRPA
oh is it a straight belt
cut and wrapped around the motor shaft with a timing pulley on it
No, the clever part is the second beld bonded to the frame
2 thou positioning error
i cant decide if that's good or bad
oh thats pretty smart
i like that design
Connor, a bell crank lever, hydraulics, pneumatics
For a router? Brilliant. For a watchmaker, not good enough. Might be OK for a chunky clock though.
i cut lots of circles
they are currently +/- 0.015" diameter
but my spindle mount has a LOT of deflection
my bed is 8x12
spindle mount and y axis ***
i learned i would benefit greatly from a much more rigid spindle and a 18x18 bed
so given what i learned from my first router im trying to think of what the next one will be
belts certainly solve a lot of problems
the only thing is my spindle is really heavy
im afraid it would cause settling issues iwth belts
improve rigidity, add webs etc, diagnose errors,
I reckon Servobelt adddresses all those issues. I really like the idea. You might need the right belt though, it needs to fit into itself.
djdelorie: #sparkfun seems to be where the geek-kids hang out. They do seem rather younger than #emc
have you seen their ads? That's the target audience
andypugh: well shit him heading over there, to hell with you old farts
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its my jubilee today!
It's cool. I seem to have fallen into a bit of a gap between radio shack when it was cool, and now.
radioshack went down hill
radioshit never had what I needed
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Shouldn't complain, mind, I missed hardware cycles but was dead-on the middle of the home computer revolution. I was even described as a "Computer Whiz Kid" in print. (the local paper).
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My mom used to go to Radio Shack and tell them "Hi, I'm DJ's mom. What would he like for Chrismas?"
but that was a long time ago
Did they ever answer "a girl" ?
I usually got a stocking full of blue cardboard parts cards :-)
I got a Philips Electronics Engineer Kit one xmas/birthday
Yeah, probably more comprehensible and ultimately rewarding than girls.
Depending on the year, I already *had* the girl.
someone has created a site for the kit history http://ee.old.no/
I have never seen those before
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(EE kits, that is). I think I saw a girl once.
the best gift i got, the radioshack armatron
They look like chaps with bumpy fronts, yes (girls that is, not EE kits) :-)
WillenCMD: There is a CNC armatron on Youtube somewhere
of course that comes second to my erector set, and two lego mindstorm sets i had *cough* and still have :)
i still to this day can get lost in lego's
jeez did everyone go play with lego's or what, i didn't mean to stop the conversation
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must have been the ee10 or ee20 kit I had, I had plenty of lego
I was always more into Meccano
really andy i would take you for more of a lincon log guy :)
i'm thinking 8020, surplus linear rail, belts, and my gecko/381ozin motor setup
and my bosch 1617 evs
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only problem is the Z
linear actuators seem to be hard to find cheap on ebay with 4-6" travel
<google> Actually, that looks like fun
I found a source of 8mils of backlash... loose coupler. Today was a good day :)
taiden: why not just some threaded rod? Z doesn't move that fast or often in a router CNC
yeah i would use acme rod for the z
i actually have a decent Z right now
could probably get away with just reusing it
sam_p: I have been there before, frustrating
it's 5/8" shafting on oilite bearings with 5" travel and 3/8-12 1 start acme rod with delrin nut
i wish the shafting were larger but you get what you pay for i suppose
sam_p: the problem was my associate was installing the motor's and connecting them to the screws, he forgot to fully tighten the couplings
was $155 shipped from John the guy who builds Microcarves
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have you guys seen http://www.microrax.com/
This was my fault. For one axis, I had to pull the coupler off the motor a little bit to make sure it meshed with the other side (it's a lovejoy coupler with rubber spider). I guess I forgot to tighten it. Doh
i picture from andy i believe one of the dozens i saw small t-sloted extrusions like half inch, i couldn't figure out where they cam from
I saw the connectors on sparkfun
They sell adapters so you can mount a servo (rc servo) to the stuff
i know, it looks pretty cool like a grown up erector set
Have you seen this 3d printer? http://www.thingiverse.com/image:133869
I never thought to use zip ties as a replacement for glue/screws haha
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It makes me want to build a delta structure
my wife wants a sprinkler system, i told her instaed i would build her a rover that would travel the yard and pull the hose to water the grass, always aiming the sprinkler into our yard, and minding elevation
Fairly effective: http://imageshack.us/photo/my-images/577/ziptiefreak.jpg/
Sounds like quite a challenge
Slap some bondo on it and you're good to go
i got the go ahead
Your wife is brave :)
so now its on, i figure i'll use a gps module and walk the perimeter loggin coordinates, then walk the house
well hold on
I do alot with gps
What type of accuracy are you looking for?
GPS can be off by quite a bit in regards to mowing
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its not going to mow the grass, usualy gps is within 4 or 5 feet i thought
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and off by a lot more for height measurements
ill use a tilt sensor for height, if its sloping down i'll tilt the head up
Eh, the best a civilian is going to get you is 2.5m accuracy.. and that's with WAAS. That's not all the time either, that's a CEP rating or so
and vice versa
Assuming you will be 10m is a more realistic estimate
The reported velocity will be very accurate however
i could always use the electric fence line
provided you are moving somewhat fast.. which I don't think you would want your motor to reach
Yea, additional systems would be a good idea
sam_p: If you have a fixed GPS and do differential, though,,
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True, that will help
you can get excellent accuracy
im pretty excited about it, i used to have a robot i build with lego mindstorm that would roam the house when the lights where off
this isn't to different lol
even smaller with high quality survey systems.. but those use additional signals
and are pricey.
Lets see, you could setup some radio beacons and triangulate your position
Or if you mow in the dark, you could use a laser system, like that one vaccume uses :D
i will install a rotating sattelite dish like the lawnower on honey i shrunk the kids
Add a kinect to it, run it in the dark, and 3d map your lawn
i like where your going with this
Attach rotary encoders on the wheels to track motion :)
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the night sprinkler, lurking in the dark
I saw that movie
i am going to use wonka vision to get the water to it though instead of dragging a hose
andypugh: I tried something today with my air cylinder.. I pressurized the retraction stage with a few PSI.. Then fully pressurized the extension stages.. when the air from those was release, the piston returned to retracted state.
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I.E. I used it as a "air spring" :)
Might be a simple solution
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Hey I've got a question for you folks. I don't have limit switches on my machine so before I turn it off, I always track it back to the machine home position. When I start it, I'm able to immediately zero everything and I'm good to go. Is it possible to put this in my ini script somehow so when linuxcnc starts, it automatically marks the machine point I'm at as the machine home?
i'll have to track down the wiki
[03:16:28] <WillenCMD> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?CoordinateSystems
alf F POSITION_FILE to find it
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Awesome, thank you. I've been looking for that for like 45 minutes now haha
it came up in one of the millions of emc user list emails
i read them all when im in the can
heh. Well, looking for it did make me come across the diy probe. I'm going to have to make that
i might have to put one of those in the night sprinkler
has anyone seen the movie Paul?
Have you thought of making a lawn cutter?
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oh im almost done with assembly on that, i was waiting for a couple of the dc wheelchair motor's to go cheap on ebay
Nope. If I had a lawn, I would border the side with a black border. Whenever the grass needed to be cut, I would sweep a laser across the entire surface >:D
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cut it all!
sounds to harsh for the environment, i'll use a water jet
I found out there's a used wheelchair junkyard near me
I need to check it out some day.. I can't believe a place like that exists
someone kidnapping old people and salvaging the "hoover arounds"
i see those people that take them out on the streets, and i keep thinking what if the battery dies before they get home
does it have a "ship to shore mode" like remote control boats, so they can make it back apon battery failure
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pelting down with rain again. I think it has rained every day this month. That is _not_ normal
send me some
Wish I could, it's flooding my workshop
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we get hints of rain but no rain
doing some rewiring now to free up that encoder
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it is dry here
wasn't dry here then
I had me own lake!
too bad i was living right in the middle of it
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yea is pretty droughted here too
but ill take it because last year this time, irine put a foot of water in my whole house
that storm was right nest to me it didn't do much here though
like the eye wall was about 8 miles from me
I watched it on the radar go by
you must not be in NY/NJ?
it was right off the coast and i'm about 6 miles inland
I mean it went right up the coast here
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ah ok yea my parents live there too and they got nothing
we actually got stronger winds the next day
it was strange
new england got hammered though
yea it wasnt too bad for me, but then 2 days later water rose 12"-18" above the record
I saw video of people's houses turning into waterfalls and stuff
worst storm ive seen id say
esp for the southern VT area
they really got rocked
let it drought i say!
I donno all the corn crops are failing
fields here are burnt up to nothing
yup i was down there for the 4th visiting them
was damned hot
they live in delaware city the corn around them is like 3' high
was the heat really kicking by the n Idon't even remember
ill take it
i was displaced for a week and came back to $60k in damage
where is DE city that up by wilmington?
let it drought
next to new castle?
oh i know new castle
right on the water there
I live in sussex county
different world here
oh ok yea youre way down there
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but Know nes castle
farmers market there
do you know seaford?
yep usea work there
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you and everyone else
haha yup nylon
place is a ghost town today
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I just had to go out there to get a new sand filter valve for my pool
I was due
yea proprety is pretty cheap down there
id like to move but dont know where id work anymore
yeah stuff is pretty collapsed here now
theres a town named Teflon?
haha no its seaford
nlkdavid there was but it didn't stick around
oh now that i didnt know
heh I wasj ust kidding
yeah dupont transferred all their teflon production to china I heard
yea it is getting worse too
i was in wilmington then was transfered to seaford
you could go work for amazon
they're opening a huge distribution center here
but they cut that back severly too
800 jobs i hear
hmm wonder what they need
they're just opening up
i remember when that amazon warehouse put up
so they are opening another?
yeah this is going to be a biggie
they pulled out of texas I think
something about taxes
taxes in texas sounds funny
here in DE we got no taxes though
yea DE is real nice like that
thats why my parents are down there
me too I'm a tax refugee
originally from NJ
haha i hear that
but i like it here it is so peaceful
almost like I'm dead already
i was from there, then went to de, then couldnt find work so now im in the greater nyc area
oh yeah that is where I'm from
yea that south DE is nice
where abouts by NYC?
im in nj in essex county
I grew up in a town called Summit
whoa swank town
silver spoons haha
my best friend in high school his dad was the senior VP of the NYSE
yeah buncha ritchies
yea i cant image the taxes in summit
jon corzine lived there to oI think
oh I can tell you what they are
i pay 10k for a crappy lot with a small house
when I got out i was paying 14 grand a year
now 600 on 3 acres :)
jebus it sure doesnt make sense to live there
wow your taxes are 600 a year?
huh thats crazy
i really need to loook for a plot down there
they even mow my front yard for me
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for what i was paying in NJ they should have been serving me breakfast in bed everyday
wow my dad was saying somethign that DE is funny with letting you build on a property though. is that true?
i would need a pole barn haha
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they don't seem funny to me
are you allowed to build somethign yourself?
the one rule we have is you can only have one domicile on a lot
like you have to live under one roof can't have 2 separate houses with folks living in them unless yo uare caring for an elderly family member
I donno I slapped up a shack in my backyard i never heard boo about it
no one can see it back there
I didn't put in a foundation or anything it is just hanging there
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I got a picture of it someplace let me find it
haha yea i would kinda need a garage. say, 36x54 or so...
aka pole barn
i have dreams of owning one
buy an old chicken farm
chicken houses are huge
I looked at one
took me like 10 minutes to walk around the thing
I wasn't walking slow either
hmm thats a good idea/scam
36x54, nothing to big
it could be a "farm" but the chicken house could be filled with machines
chicken house is like 30x300
30x300 i would certainly take too haha
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oh yeah they're gigantic
there is going to be a job fair for amazon i heard
you could run down and go
now they are opening a place in south DE or north?
I forget look it up
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yeah looks like middleton
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man when I order stuff off amazon it'll be here before i click the mouse
yikes 1M sqft warehouse
we're a small state but we think big
DE, we like our states small and our warehouses enormous
oh and your smooth roads
check out this place it is a gas station http://goo.gl/maps/oxML
i remember my commute was on one of the smoothest concrete roads in the country
is that the biggest gas station you've ever seen or what?
they got a sports bar in there
thats a gas station?
I go to a flea market they hold there on the weekends a lot
Disney gas or something?
its nuts isn't it?
when yo ugo in there it is like disney world sometimes they got live music
mostly there ain't much of anything around here though
thats perfectly fine with me
let me find a picture of my shack
if i have a decent job and my pole barn, ill keep myself occupied
hit that amazon job fair
[04:37:31] <pfred1> http://img7.imageshack.us/img7/8210/72363334.jpg
I built that just winged it no permit no nothing
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I can't even see it from my house
cool, run electric?
only when I was building it
it took me over 320 feet of extension cord to reach back there
I wonder if i can be a "IT Manager"
i dont really fit in to anything else
you're a computer person?
I always worked construction
typically develop electronic hardware (like circuit boards) but lately it's computer stuff
so are you retired?
I didn't want to but things got so bad I was like skip it
must be nice
I miss it plenty
but don't miss some of it
yea where you live id retire too haha. Id surely find something to keep me busy
their automated order collection machinery needs electronic techs i bet
someday I'll finish my CNC machine
but im not quite ready for it yet $$$ wise
I got off track with it when I got this computer but this thing is just about done now I guess
I want to make these arms for my front speakers still
I made brackets for them already
nlkdavid, where did you see that "order collection mach"? a listing?
but I want them on the ends of arms
yea i just have a small cnc but im sure if i had the room id get a bridgeport or two
check out these arms i made for my monitors http://www.instructables.com/id/Under-Shelf-Dual-Monitor-Support-Arms/
yeah good luck finding a bridgeport here
haha you know, i must have talked to you before
DE was never exactly the center of machining
just from videos of amazon order fullfillmant facilitates
because ive seen these before
they are nice man, gotta say
they were my most recent project kind of
I was screwing around with my solar pond for a bit but kind of gave up on it
pfred pick anything cool up lately?
well I gave up on making a whole controller for it
WillenCMD not that i can think of this is the slow season now
once it gets hot everything kind of dries up
I haven't even went out shopping the last couple of weks
i see, i went to look at a logan lathe the other day
this was the last thing I got of note http://i.imgur.com/OCtWd.jpg
that was a while ago now
$10 that whole load
that kind of machinery must require some maintenance / adjustment of mechanics & control systems
is that wood?
the screen arms
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oh yes mostly
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I made the brackets out of metal
it looks like an electronic kit a student would recieve from a tech school
but the arms themselves are oak
WillenCMD that is what i thought
WillenCMD except it came with some really expensive leads
I mean nice jumpers
I was happy to get them I don't have to omany as nice as they are
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think this would be a decent lil keyboard for linuxcnc? http://www.amazon.com/gp/product/images/B005TWV9TU/ref=dp_otherviews_z_0?ie=UTF8&img=0&s=miscellaneous
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sure that thing looks pretty cool
i wish it would have one of those membranes over it though
for dirt protection
but still looks pretty cool
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just throw your keyboard into a plastic bag
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doesn't seem to be allot of info on remapping keyboard shortcuts in linuxcnc/axis tho
[06:08:54] <nlkdavid> http://thread.gmane.org/gmane.linux.distributions.emc.user/12638/focus=12642
is all i found
I just remember when backspace didn't work in Linux
[06:11:30] * pfred1 has been running Linux a looong time
we used to have to do something in order to fix it
I don't remember exactly what that is today man that was a long time ago
but it was some file you had to edit or create and edit
some crap that you'd think would have just been done
heh, without making a mistake
it still suggests to me that you can remap keys in Linux a lot though
well you can always use ctrl+H
I think that is backspace
yup it is
I just checked :)
but the frigging backspace key didn't used ot just work in Linux
this is going back almost 20 years
it was a long time ago
I started running Linux in 1995
that is a long time ago now
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stuff was pretty crude back then
ya, well I 'm into linux all of 2wks now, lol
it took me a good 3 days to figure out how to mount a CD
I was like read the thing!
forget about getting online that took about 3 weeks
since getting a cnc, hehe
I never did figure out how to do it the right way I found a script that generated my scripts
today I could get a monkey to run Linux
it is so easy if you can drop in a CD or insert a USB you're golden
I guess Linux asks your for your timezone a username and a password
but you can uh huh the rest of it
wait come to think of it a live image will just drop you on the desktop online
well the gui is great for users, but advanced admin tasks r brings me back to my DOS days
nlkdavid so you've only run Linux for 2 weeks?
well there are some gui admin tools
suse is big for those with yast
you can do it all with yast
thing is a linux system once you've set it up you're done
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I ran one linux box for 8 years until it literally blew up
the caps on the motherboard all failed
will that run on lucid?
but desktop environments usually have some kind of system administration tools
like gnome has one KDE has one
for that kind of jazz i kind of like the CLI myelf though
I save text files of it then just copy paste
there is a way of listing every package installed on your system then cloning it I was reading about the other day
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works on a command line redirect
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ubuntu lucid 10.04 has nothing about HW in the gui
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you mean like the my computer thing in windows?
that i found
I saw one once
like device manager
though the name of it excapes me now
today what freaks me out about Linux is udev
that is kind of new to me
that is your real device manager in Linux
you know about /proc yet?
cd /proc in a terminal
then all the files in white you can cat those
like cat /proc/cpuinfo
just do it
cat spits stuff out
short for catcenate
ah, like dos print
cat is a big command
this is a neat one you have to be root to do it though
tail -f /var/log/syslog
then plug in a USB device like trigger an OS event
it is a powerful debugging tool
you can head files too
but tail -f makes it just go until you ctrl+c it
nlkdavid you do know how to gain root right?
you can rig it up so your primary user has all root priviledges
i love ssh & putty btw
I don't use them
I do use other linux networking stuff though
I'm a big nfs fan
one of my machines runs an nfs server
ubuntu has a secret root password, only sudo works
so it is a shared network file on my lan
no what ubuntu does is it makes root's shell null
so root can't actually login
you can fix that if you edit /etc/passwd I believe
i'll check that
least i think that is how they lock the root account out from logging in would be the most sensible way of doing it
[06:38:18] * pfred1 doesn't run Ubuntu
grep root /etc/passwd
/exec -o grep root /etc/passwd
[06:40:13] * pfred1 shells in his IRC client ...
I wonder how Ubuntu handles single user mode though?
where you have to be root
bare with me, i'm disabled, & use an on-screen keyboard
see that is one of the things I don't like about Ubuntu they treat their users like they are not to be trusted
I mean why screw up the root account?
nlkdavid do you know about virtual consoles?
this can be a handy thing to know if an X Window app goes south on you
no, i'm using vnc remote desktop tho
id@linuxcnc:~$ sudo nano /etc/passwd
ah so you're not really running a native Linux session?
i'm on my XP desktop, i'm controlling my linuxcnc/ubuntu computer, which is in next room, via vnc & ssh
root@linuxcnc:/home/nlkdavid# sudo grep root /etc/passwd
passwd is world readable
hmm so that isn't how ubuntu stops root logins
yeah, look at shadow ;)
I thought shadow just held the encoded passwords?
root@linuxcnc:/home/nlkdavid# /exec -o grep root /etc/passwd
so good luck
put on your cryptanalysis hat
bash: /exec: No such file or directory
I've forgotten my root password on boxes and had to erase it
single user mode for that
nlkdavid /exec is a thing with my IRC client
er oh oops
that is how I did it boot CD then mount partition then remove the field in passwd
so you have a null passwd
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I think there is also some trick with chroot
now I'm smart i just put my password on a postit note on my computer
but I haven't had to do that in years
well I have like 5 computers and i use different passwords on each of them how am I supposed to remember that stuff?
some of them i don't login or out for long times
skip it postit note
-o grep root /etc/passwd
-o: command not found
yeah I would still forget all of those
I love postit notes
what a huge fail win
hey we got this glue that sticks liek crap
lets make a fortune with it!
a silver lining :)
I hear the guy was sitting on the pot all depressed about it when he came up with the idea
I mean the glue was supposed to work a lot better
I had not heard that story
no one set up to make such a weak adhesive
root:x:0:0:root:/root:/bin/bash do i remove /bin/bash?
no it is fine
or add root: to my account
that isn't how ubuntu keeps you from logging as root
beats me how they do it
least they do setup sudo nice
debian I have to edit sudoers
but sudoers is where you can escalate your user's privledges
I think you can add your user to the wheel group too or something and that does a lot for it
r u not running emc2/linuxcnc on one of ur computers?
I made a custom build
I downloaded the source code
what OS u running it on?
[07:12:19] * pfred1 really doesn't like Ubuntu ...
I use Debian Lenny on my CNC machine
so it is still Linux
just not Ubuntu
that box will run X Window in 32MB of RAM
which is pretty amazing
it boots up in 18 seconds too which ain't bad for a 1GHz P3
[07:15:02] <pfred1> http://img87.imageshack.us/img87/2250/wedoct27bootchart.png
oh wait 16 seconds
even ubuntu is dam quick booting
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my i3 comes up in 5 seconds
I never even bothered tuning it up any
compared to windows, its astonishing
yeah windows isn't a real OS
I wouldn't let the stuff time a coffee pot
but it is awfully popular
I think it is because everyone gets it for "free" when they buy PCs
ya, why i'm not running Mach3, windows is the wrong os for cnc control
as easy as Linux may be to install I still think it is too challenging for a lot of folks to do
well those mach3 people all seem pretty pleased
personally I think the mach3 interface looks like something ripped off a video poker machine from Vegas
I'm manageing with ubuntu cause i'm very computer savy + google
my Linux use predated google
but I google a lot of stuff today and google does seem to have a soft spot for Linux
sometimes I search for Linux stuff with bing just to piss microsoft off
I bet bing runs on Linux
they'd be crazy to run it on windows
that is where Linux really owns is in all that gigantic parallel computing
92% of the world's fastest supercomputers all run Linux
[07:26:01] <pfred1> http://www.top500.org/
Sequoia runs Red Hat
which I must say is quite a feather in their fedora
imagine licensing 1,572,864 cores with Windows
I bet Steve Ballmer would personally hand deliver that!
ouch! oh about the Windows comes free with computers, now cheap computers come with Win7 Starter Edition, which doesn't even allow changing ur wallpaper
well with the cost of PCs today Windows is no small chunk of the total
they gotta charge about $100 for Windows
last PC I built whole thing was only $326
so Windows would be a good third of the price
I read the win7 EULA the other day and technically you can't even let someone else look at your PC while you're running it
you're breaking the rules!
well, i bought win xp once like 9yrs ago, installed it on many builds
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I ran SUSE 8 for almost 9 years on one PC
but it blew up
the PC not SUSE
I pulled the HDD out of that machine and it booted in another system I built out of junk
it did run kind of funny though
lots of errors when it booted up
after a couple of weeks i had to wipe it out and start fresh
will u b here tomorrow? i needa get some sleep
I pop in now and again
I'm going to hit it too late here
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just reading the wiki, thought id drop in n see how active the irc channel was :)
early morning on a saturday anyway
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im interested in using emc2.linuxcnc as a controller for a delta robot
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I could use a little advice on hardware, if someone can help? I have a delta robot built around hobby servos and an arduino. I have the kinematics succesfully coded and it works fine. I'm interested in improving the quality of the machine, improving speed, accuracy and trajectory control). I'd like to replace the hobby servos with stepper motors of maybe dc motors with encoders (or other better option?) and
the arduino with a pc and linuxcnc
what do i need in terms of hardeware, to sit between my linuxcnc pc, and the stepper motors/dc motors?
i know how to connect them to an arduino, i have I/O pins, but how do i interface the delta robot hardware to a pc?
(sorry for long question)
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Im guessing here but probably a parallel breakout board hooked to the arduino
right, so parallel into the pc hardware, to breakout board to arduino
thx, i'll google around that
i thought i might be able to dispense with the arduino and have the pc do it's work though
then figure out how to get the arduino to work with linuxcnc
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[10:34:39] <r00t4rd3d> http://ckcnc.wordpress.com/2010/11/20/arduino-emc-integration-how-it-works/
oh that looks interesting, thank you r00t4rd3d
:) it was the first link in google for "arduino+emc2"
i didn't realise i needed to keep the arduino
or id have googled it
you probably dont
but you will need some kind of controller
i thought (im new at this) that the emc2/linuxcnc and pc reaplaced the arduino
nope, there is always a controller of some sort
yeah, thats what i thought, bin the arduino but osme new hardware to drive the actuators, I just wasn't clear at all on what hardware that might be, hence difficult for me to google it
pc = controller = motors
cnc controller would be a good search term
but gecko and the tb6560 are the ones many people use
i personally use a tb6560
have you seen the grbl sheild for the arduino?
gecko and tb6560, right, thx *googles*
nope… will look that up too :)
[10:40:35] <r00t4rd3d> https://www.synthetos.com/webstore/index.php/assembled-electronics/grblshield-grbl-arduino-diy-cnc-shield.html
[10:43:04] <r00t4rd3d> http://www.ebay.com/itm/3-Axis-CNC-Engraving-Machines-Stepper-Motor-TB6560-Driver-Board-Controller-3-5A-/180832754485?pt=LH_DefaultDomain_0&hash=item2a1a78db35
that would replace your arduino
ooh, that loks interesting
interesting as is cheap
well, that, plus replacing arduino
and that has a parallel interface to the pc, which runs linuxcnc, yes?
and my stepper wire connections etc i just screw the wires into the screw terminals
or you can manually control it with a ps2 controller and no pc
they come with wire connectors
oooh, yes, i see connections for limit stops, and there are the three steppers… :)
it dont come with that stuff
just shows as example
right, so i need to buy thos ebits, and break out my soldering iron
slow down arduino boy
oh, yeah, you mean i need to buy limit switches and steppers, yeah, i understand that
i just meant i could see the connections etc in the diagram
only thing you need to solder by choice is stepper motor leads
the tb6560 is considered the el-cheapo route to a cnc controller though. Lots of people have had great luck with them, lots of people have thrown them in the trash.
if you can afford a gecko controller, get one of those.
okay, can i clarify my understanding of the tb6560 set up with you please… i have my pc running linuxcnc, use a pci card to give me a parallel port from the pc, which i connect to the parallel port on the tb6560. To the tb6560 i have screw terminals to connect my 3 stepper motors, and connector for limit switches. So i then configure linuxcnc to drive my set up directly.
i can afford more, money isn't a problem
your theory is right
i'd like the best and most user friendly set up i can get. I'm happy to spend more if it will buy me an easier route into leanring about this stuff
i'll look up a gecko now
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[10:56:56] <r00t4rd3d> http://www.ebay.com/itm/Gecko-Drive-G540-4-axis-3-5A-24V-or-36-or-48V-power-supply-/290743557197?pt=LH_DefaultDomain_0&hash=item43b1aa9c4d
something like that is top of the line for DIY
im not sure how that price compares either but i know they are expensive
thx very much
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Sub-, look at Mesa 5i25 7i76 for a stepper setup
roger, googling now
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btw, im not married to a stepper set up, i'll gladly go with dc motors with encoders or other setup if something else is considered a better way in
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what kind of machine is it?
so not cnc, but v similar needs
this sort of this (this one isn' tmine): http://www.youtube.com/watch?v=jt_VsDzH6TI
i have the kinematics stuffi need to get linuxcnc to drive the robot to x,y,z coordinates, then i need a few extra pins to monitor a vacuum sensor, and open/close a colenoid valve (for the vacuum pneaumatics)
7I76 is designed for interfacing up to 5 Axis of step &dir step motor or servo motor drives and also provides a spindle encoder interface, isolated analog spindle speed control and 48 isolated I/O points for general purpose field I/O use.
7I76-5I25 Plug-N-Go kit 5I25+7I76+IEEE1284 cable 6 ft. $199
I use that on my plama table
hmm, i think some of this stuff may be too cnc specific for my needs, given that i don't have the experience to easily mod it
what would you have to mod?
well, i think the three axis steppers would be fine, i build in the delta robot kinematics to linuxcnc and that will work well. Then i need to switch an off/on signal as my toolhead gets to specific locations, which i guess i can link to the cutter type control so should work fine, but then i also need to poll a vacuum sensor at several points, before allowing the robot to move to next location. I'm not clear in my head how I'd do that bi
with this stuff
the 7i76 has plenty of I/O to handle that
linuxcnc has digital I/O from G code
[11:21:26] <jthornton> http://linuxcnc.org/docs/html/gcode/m-code.html#_m62_to_m65_output_control_a_id_sec_m62_m65_a
it will basically be: move to xzy, turn on vacuum, move to xyz (suction grabs marble), poll vacuum sensor to check object grabbed, move to xyz, turn off suction (drop marble), poll vacuum sensor to ensure vac is gone (object dropped), move to next xyz, repeat etc
okay, looks good
use the digital I/O in G code to turn on your vacuum and check your sensor
i didn't even know g code had that kind of capability, heh
so far ive just been doing that with C++ type arduino code
checking i/o pins with if, else, if type statements
the Mesa 5i25 / 7i76 + Gecko 203V drives if you need the power or Mesa 5i25 + Gecko 540 if you can use lower power
those are O codes
[11:25:19] <jthornton> http://linuxcnc.org/docs/html/gcode/o-code.html
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[11:25:47] <jthornton> http://gnipsel.com/linuxcnc/tutorial/gen02.html
[11:25:56] <jthornton> http://gnipsel.com/linuxcnc/tutorial/gen03.html
i think lower power will be fine, im not moving much mass and happy with relatively low acceleration, and im not doing any cutting
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these look great, ty jthornton
so much to read! (bookmarking like crazy)
the Mesa 5i25 $80 the Gecko G540 $300 and you have up to 4 axis of drives just add steppers
you don't have near the I/O with the G540 but it don't sound like you need much
still have the other port on the 5i25
I still like the G251 drive for a <50volt supply
max i/o and drive stuff i need is: 3 axis steppers, 3 limit switches would be real nice to calibrate them, one digital pin for high./low signal to control vacuum solenoid valve, then two more for vacuum present and vacuum not present sensor pins
another option is to use the parallel port and you have up to 5 inputs
3 steppers take up 6 of the outputs so that leaves you 6 outputs for general use
in Linuxncnc you can home each axis with the same input
ah, okay, got ya
connect all three limits into same pin
you know which one is giving signal coz thats the axis you moving
you have to home one axis at a time
that can be set up in your ini file to home them in the sequence you desire
heh, talking to you guys im now quite interesting in building a cnc
I still like the 5i25/7i76 combo with either G203v or G251 drives as being easy to install and lots of options
the g203/g251 are stepper motors?
stepper motor drives
yeah, you did say, one higher power than the other
sorry, too many new parts for me to keep track of :)
there is a place that sells the gecko less than the gecko site let me see if I can find it
this guy seems decent: http://www.ebay.com/itm/Geckodrive-G540-4-axis-REV-8-latest-version-with-the-recent-mods-/290743048635?pt=LH_DefaultDomain_0&hash=item43b1a2d9bb
i dont know how prices compare
price looks good
he's not listing the g203v or g251 though
100% positive feedback is good
looks v relaible
the g540 is kind of a pain you have to solder all the wires to the db connector
im fine with soldering
I prefer the G251 (same drive in the bare) with screw terminals
ah, i see what you mean… reading, it looks like the g251 is just bundled into the g540, to give a neat all in one packeg
yes, but that limits your I/O
I found the web site http://www.kelinginc.net/
is there any starter-kits which I could simply use to build home automation like legos? :)
and killed all the spammers on the forum from last night :-)
moin + brb, windows-update-reboot
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I would like to run some small motors and put some switches
Sub-, you can get power supplies from that link too
maybe some lights
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Tuipveus: if you want easist and cheapest way to drive some motors, leds, switches and other stuff, you want an arduino
that will let you play and experiment cheaply (just couple it with somehting like the adafruit motordriver shield)
there is a system that piggy backs a signal on the mains to control home stuff iirc X10
I just bought Raspberry pi... but I am not sure if it is usable
rasp pi is a bit limited in I/O atm, i think
not sure if it is possible to build rt-kernel for it... and GPIO seems electrically complicate for me
if there would be some extension-board OR if I would be able to control ethercat-modules with it, that would be option
this link looks good, thx jthornton
that is the new web site for Keling
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site is a little slow, they need to put an extra hamster in the wheel
another thing I like about the G251 is it comes with a heat sink all ready mounted
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yeah, im liking this g251 idea. As a standalone bit of kit, it will be more adaptable for me. I can easily use it with other projects
looks like i could just connect it straight to my arduino for fun for example. just give it some power and a stepper and away we go
all you need to send it is step and direction inputs
which i know how to do
3.3 and 5v compatible
i like knowing how to do stuff, it gives me confidence :D
yes I am the same way
i come from a mechanical background, so all this electrical and electronic stuff is v new to me
lot of fun of ocurse, but im still very shaky on a lot of it
I struggle with the electronics too
I can't even get a 555 blinky light to work
i dont even know what a 555 light is :/
I think I hooked it up backwards and blew out the chip
555 is a timer chip thingy
oh, i been blowing loads of stuff up, mainly h bridge chips
I was going to use it to pulse a stepper drive to turn a paddle for a cooking pot lol
i been ripping apart old broken printers, and robbing the dc motors, steppers and encoders out of them, then firing them up with the arduino, and blowing up the driver chips :D
good learning experience
lol, lol, how lazy do you have to be to want an auto stirring pot
I tried that too with floppy drive steppers
it is for candy where you have to stir it constantly at a slow speed
this frees you to monitor the temperature of the candy
ah, i see
for a friend that makes the best Carmel you ever ate
i think i need to test that for myself, send me a couple of pounds
never seems to be any left
brb, second cup of coffee time
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coffee is a good idea, but first i should change from the morning gown to a more decent clothing ;-)
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what's wrong with morning gowns?
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elmo40: not really safe when milling...
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neither are sandals when welding
I finally found a wall wort with the correct numbers on it :-)
JT-Shop: Are those OSHA Approved steel toed sandals?
are you saying I have steel toes?
not at all
I have steel toe Croc's ;)
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here is a perfect one 12vdc 1000mA
it even works so that is a bonus!
[13:43:56] * JT-Shop checks todays schedule and so far the only thing on it is a nap
andypugh, did you get the linuxcnc livecd loaded on the yellow box?
are bare 7i43 pins active high or active low by default?
Yes and no
I boots from both Lucid and Hardy LiveCDs, but the Lucid one is very skow, and the Hardy one can't see the Compact Flash card to install itself.
But it was getting very early (like, 5am) and I lost interest
yes at 5am I'm just getting up
you a late riser?
my body alarm goes off at 3am
i just didnt listen to it today
my bladder alarm goes off at 3am
tried moving those io pins last night and never did get them working
was why i asked about active hi lo
i need to look at the config in the daylight
the only thing I know about a 7i43 is I don't know anything about it
unless i just flat got the wrong pins assigned
moving io 10 12 and 14 off it so i can use that as an encoder on the 7i47
Tom_itx: Aren't they clearly labelled on the 7i47?
and putting them on the 2nd 7i43 connector
io 35 36 and 37
andypugh yes i had the right wires
i'm pretty sure they were because the pendant quit working when i unhooked em
You can connect IO direct to the 7i43. I have done it. You might have to setp the pins as inputs. There might eb thigns to do with jumpers too. It was a long time ago when I set up my 7i43 machine.
i already have my limits on it
And they work?
i may have forgotten a software step along the way last night
yes they work
My feeling is that they have weak pull-ups, to grounding them sends a signal.
i'll see what i did on the limits
most everything i have has an in_not behind it
Yes, you need is_output as 0, and then in-not goes high when the pin is grounded.
i probably missed the first step on that then
i was trying search and replace on those pins last night and only found one instance of each
i would assume the 2 boards share a common ground
since half the ribbon is ground
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all of our FPGA pins are active low (so inputs have pullups to guarantee that they are inactive at power up if driving outputs)
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The 7I43 enables built in pre-config FPGA pullups, and all 7I43 configs have pullups on all GPIO
most of the other cards have 3.3K pullup resistors on the I/O pins
pcw_home: Maybe I'm confusing somethign here, but wouldn't active low change the state of the pin(s) from the powered off state to the powered on/initializing state?
Ok, no power, pin is LOW.
Powered on, pin goes HIGH
state has changed
no? yes? maybe?
it just means that if you switch external devices they need to be referenced to "high"
(which is standard for things like OPTOs so active low makes the most sense)
do you see what I'm saying though?
yes but theres a hidden assumption in what you are saying
pcw_home: Ok, so if the OPTOs are powered up BEFORE the PC is, wouldn't that make the optos input active?
(that external loads are referenced to ground not V+)
So GND is switched typically is what your saying?
i think i just need to reverse the logic on these or something
pcw_home: Just trying to understand is all =)
Yes, OPTOs typically work this way from the TTL/DTL days when outputs could sink more than they source
pcw_home: Ewww, me no like. I usually wire things with common ground, mainly due to the fact that if something ever shorted out, it has some place to go.
[14:29:40] <r00t4rd3d> http://i.imgur.com/awqBA.jpg
And its still true with parallel ports (they will mostly all sink 15-20 mA) but often only source a few mA
pcw_home: I understand the reasoning behind it, doesn't mean I have to like it though =)
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pcw_home: So when you buy an OPTO pcb, it's typically NOT common grund?
So since we are compatible with things like OPTO22 racks we really have no choice but to be active low at the interface level
Now externally we like active high (so a grounded pin does not turn on an output and a grounded input does not look "OK")
pcw_home: Oh, I get it (now), Just would have thought OPTOs are common GND, not common HIGH.
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Nope (and one good example of a common low input, the Gecko 540 charge pump) causes lots of trouble
thats the one that requires you to set the port into EPP mode to have enough drive on the pin they chose to drive it (16)
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I do think most of this comes originally from TTL/DTLs high sink, low source current specs
So, I have this PC. It has Ubuntu installed. I don't know the root password. Suggestions?
Yeah, just if it isn't "pointed out" I can see the confusion
i just fixed that on mine
google is your friend
andypugh: you dont need it?
I do to run the linuxcnc install script
andypugh: sudo is your friend
cant sudo it
sudo su root
Huh? That needs a password
andypugh: are you logged in?
Sorry, I used an extra sonfusing word. I don't know _any_ password.
andypugh: are you logged in?
then sudo su root if you MUST be root, but sudo should be fine.
I don't know that administrator password.
Or any password
The machine auto logs in as dmp. That's the only user account.
and you dont know dmp's pw?
you boot in recovery/maintenance mode
thanjs pcw_home, found that on Google, seems like the way to go, after my lunch :-)
boot from a livecd and do password recovery from there
mount the drive r/w
set the password
dont need to (at least I didn't on 12.04)
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Mechanically, is there some simple way to have (for example) both halves of a pair of jaws move towards the center at the same time, so they are always "centered" so to speak?
Jymmm: Yes, see for example 3-jaw chucks
2 steppers + EMC?
yes, KURT makes such a vise
andypugh: does that involve a common "ring" ?
I have designed such vices.
right and left hand threads on a common shaft
Tom_itx: They have those at walmart, right?
You just need a thread with left and right hand threads of the same pitch. I even found a pair of standard threads which matched the requirement (small UNC and larger UNF) By cheating on the dimensions it was even possible to assemble from one end.
Jymmm, a parallel jaw gripper
Jymmm remember when mythbusters crashed those 2 vehicles? do it that way
call them for advise on it
It has just occurred to me that I have no idea how a 3-jaw chuck works.
Tom_itx: with 2000ft of cable and a big ass tow truck, gotit!
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a scroll in the back
ok i think my buttons are tied to 5v so when pushed the pin goes high
My new sniglet crimper is parallel that way (but 4 jaws)
i guess i'll have to take it apart to find out for sure
jthornton: Perhaps I should be more specific. I have no idea how a 3-jaw chuck locks without chatter.
andypugh on a helical screw
The scroll rotates in the body. It can't rotate with zero clearance, but if there was clearance then the work would float by that clearance.
think 3 legged stool
OK guys, just for the moment, imagine that I am quite clever, and I know tha obvious stuff. :-)
The jaws are radially constrained only by the scroll. So what stops them wandering by the clearance in the scroll bearings? Is there some conical face somwhere, I wonder?
I've had one apart and the scroll is a snug fit IIRC
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It is kind of obvious how they work in a broad sense the first time you swap the jaws. Which I probably did at the age of about 10. It was only a couple of years ago that I stopped looking at the numbers on the jaws and started looking at the teeth to work out which one went in first, though.
perhaps the angled face of the scroll teeth push the jaws out and the scroll back
[15:31:02] * JT-Shop never uses a 3 jaw chuck
I was wondering if the angled gear teeth play a part? You might want to force the jaws out against the T-slots too.
the one in the picture looks pretty parallel though
I use one very frequently, they are very much good enough for the vast majority of jobs.
ok pcw_home, my button goes to 5v so do i need to invert the logic on the input pin?
i think it is already actually
but do i need to initialize the pin differently in that case?
It needs to pull the pin down
(if this is a bare FPGA pin)
well shit. that just sucks. all my other buttons go to the 7i47 and are active high
guess i'll rewire this whole flippin thing now
Tom_itx: Do you have a wiring diagram?
Tom_itx: No use rewiring anything if you don't.
Well you could make a custom 7I43 config with pulldowns instead of pullups
i'll just make all the buttons active low
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I suspect there are some cunning design features in the chuck which are not immediately obvious.
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bbl, thx for the advice earlier today
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So, how do I make the grub menu show up (shift key isn't working, even with a PS2 keyboard)
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I suspect you are correct andypugh
OK, tapping ESC got me the boot menu
you buy the jaws in matched sets i know
and they are numbered acording to the slot they fit in
so they will fit the helical screw and close properly
otherwise one would close before the other 2
you can just look at the back of the jaw to see which slot it goes in
Tom_itx, did you read that page I linked?
You can tell from the back of the jaw which one goes in first. I don't actually know how much it matters if that is slot 1. (I always put the first one in slot 1, though)
JT-Shop on your offset page?
did it make any sense?
i didn't realize you had to set them that way though initially
ok thanks for reading
i still have it up in the brouser and i'll look it over closer later today
gotta go 'shopping' today :(
ok, I have a couple more paragraphs to go on touching off to material
there may have been some wording i would change but i can't remember what it was right now
gettin ready to leave here but i'll check it later on
[16:02:37] * JT-Shop is fixing to take a nap...
while i'm rewiring buttons :)
wanted to do that now but don't get to
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Is this any good? crap? http://www.grainger.com/Grainger/HARRIS-Medium-Duty-Nitrogen-Regulator-5KZ42
does grainger sell crap?
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everybody sells crap
i thought smith and harris were 2 top regulators
just don't get one from walmart
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Hey, I get high quality and lows prices from walmart (parking lot fell off the truck sale)
but is it $220 quality crap is the question
is anything worth what it costs anymore?
Tom_itx: Advice on IRC
but some of the best advice i've gotten was from here
Don't eat yellow snow!
i like that video
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Did you see the new one? 2 girls and one bucket? One of the girls is lactose intolerant.
r00t4rd3d: Like I told you back in June... 2012-06-12 18:39:09 Jymmm: r00t4rd3d: Here, watch some CNC pr0n http://www.youtube.com/watch?v=A_qHR_H_2cg
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I don't understand the part where they appear to be circular-milling an eccentric hole. It seems like that would be easier with a non-rotating workpiece?
plenty product placement in that
P Horn gets some very clear branding
as I get deeper into the hobbing machine, I think all the cam auto stuff may get removed, that then gives mounting holes and holes to push Z and when cnc ability yo make helical gears
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Take photos, and put all the parts in a tupperware box, with the photos, in the base of the machine, for the chap who restores it in the year 3000 :-)
archivist: sounds like a fun project
archivist: sounds like a very good plan
[17:53:50] <skunkworks__> http://www.youtube.com/watch?v=NilRzkLNrOM
im gonna get a parrot and teach it to say that
Im having a bbq today, Im getting cooked.
Live tooling too! That's showing off.
I am going assume that http://www.youtube.com/user/br7may
assume he is a spammer?
No, quite the opposite.
He is the maker of that amazing lathe that skunkworks__ just linked to
I get a good feelign knowing that I helped hi get it going.
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Hi all im writing now my own cam post prozessor for use with STL and Lathe Milling
without a Y axis it might lok a liiiel wire
lets see what we will get from it with a difficult part
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[18:53:26] * Loetmichel has gotten a shipmend today... that should last a while CA-Glue-wise... -> http://www.cyrom.org/palbum/main.php?g2_itemId=13424 ;-)
I think ricky_a is a girl
andypugh, did you get the livecd to load on the yellow box?
Yes, but no.
It will boot off the 10,04 liveCD, but realtime won't work
that's not good
Schooner has one too, and is of the opinion that we will need to realtime-patch the vortex kernel.
However, Anthony did denonstrate it working, so I am puzzled.
mine is due in Monday and I have a power supply on my desk so I'll give it a whirl too
he seems to be watching the thread
I tried installing on top of the supplied Ubuntu with the script, but it won't boot from the normal rtai kernel.
you used a usb drive to boot from?
I will try the 10.04 script, but want to make a backup of the flash drive first.
ok, glad you got yours before me :-)
Yes, just using the liveCD images and the Ubuntu Startup Disk Creator
Is there like 2mm ID linear bearings? And do linear work (minimally) as radial too?
yes and maybe
not spinning as much as rotation
hmm, how to convert pwm to analog with a driving power to up to like 10A :P
depends on the type of bearing
JT-Shop: Am I looking at those 'C' type?
ok, half done shopping. aarg
JT-Shop: Hmmmmmm http://img2.tradeee.com/photo/10908011/Ball_Holder_Bearing__Ball_Retainer_Bearing__Linear_Bearing.jpg
no, those don't rotate
JT-Shop: the vbx don't or the torture chamber looking ones?
MrSunshine: Power Op-Amp?
dang finished the last Gurley's off
JT-Shop: quick, order more http://gurleysfoods.com/
I still say they look like a medieval torture device =)
ok, they do both. But phuuuuk me, at 2mm ID, I think I'm screwed
I just go to Orchlens and pick up a 48oz bag every few months of salted in the shell peanuts
[19:32:01] <r00t4rd3d> http://www.wimp.com/chesspieces/
check that lathe out
Jymmm: I think there is a fair chance that Mahr go that small.
andypugh: Oh, cool!
andypugh: I need a rod in a rod in a rod, so I hope so
But how do those "stay in place"? If you have a 16" shaft, do you use a 3" long bearing?
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Jymmm: They only go down to 2.5mm. Is that small enough
andypugh: is that ID ?
[19:36:43] <r00t4rd3d> http://fenlaners.blogspot.com/2008/03/bow-lathe.html
[19:36:50] * Jymmm grabs calipers
They don't stay in place, the ball cage always moves half as far as the rod
i got that problem too
"and finally fix a piece of wood between the two uprights as a tool rest"
andypugh: 0.078" is the OD of what it needs to go on. a lil slop is okey though, mostly linear motion
2.5mm might be fine
[19:42:04] <JT-Shop> http://www.bbc.co.uk/history/ancient/british_prehistory/ironage_tasks_gallery_11.shtml
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Is the concept of a pole lathe new to you guys then?
seems like we knew about them before we came over here
except for the chaps that were here first
I first saw on on the Woodwright's Shop
[19:50:06] <JT-Shop> http://www.youtube.com/watch?v=NPkyxvDwwz0
according to my calculations the 0.125 key slot on this 0.625 shaft needs to be 0.067 deep... I hope
[19:54:19] <r00t4rd3d> http://www.damngeeky.com/2012/07/10/lego-rolls-royce-trent-1000-is-worlds-first-functional-jet-engine-modeled-from-lego-bricks/
lego jet engine
[19:55:04] <r00t4rd3d> http://live.wsj.com/video/jet-engine-made-from-150000-lego-bricks/516BC0E5-5FA4-48C4-BC42-B2CFFA23872C.html#!516BC0E5-5FA4-48C4-BC42-B2CFFA23872C
[19:56:07] <r00t4rd3d> http://i.imgur.com/e2sk6.jpg
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Burritos with a side of chitlins
OH YEA! that came out very nice
did you take a crap?
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why doesnt stepper drivers use constant current sources insted of choppers?
a chopper is a constant current source
Choppers make a lot less heat than linear. They _used_ to be linear.
MrSunshine: a chopper is a digital constant current source
Calling that jet engine "functional" seems to be rather over-stating the case
and is a heck of a lot more efficient than an analog version
yeah but a constant current source using like opamps could be driven digitaly also ? ... just a R2R network or an DAC that outputs what voltage (current) it should hold? :)
sure, it should work
it's just not very efficient
hmm, what makes it less efficient? :)
opamps just dissipate the excess in heat
where-as choppers just switch it on and off efficiently and use the inductive properties of the stepper motor to keep the current nice & stable
well the opamp is supposed to drive the H bridge
oh you want to make a comparator based chopper driver?
There have been some systems that use a variable supply voltage ((a 2 phase VFD)_
fragalot, just looking at what exists and what i do not find and i figure would be neat and asking questions =)
and smarter drives use PWM instead of chopping
eg. measure the current via a resistor, compare the voltage ovr tht to a preset (via a potentiometer or something) and have the opamp work in comparator mode switching the H on and off?
Thats a chopper
pcw_home: That's what I was going to say
fragalot, no switching the H-bridge on so that the current throught it is held at a constant
not fully on, not fully off :P
MrSunshine: so dissipating heat
all the time
if it's not fully on, nor fully off... where does the energy go?
fragalot, but if you do not let more then 0.1A for example throught the H-bridge then it wouldnt have to dissipate the full say 1A that we say is the maximum current for the winding ?
MrSunshine: The power dissipated in a device is the voltage drop over it x the current through it. Choppers are always running either at zero voltage drop or zero current. So dissipate no power. A linear device will typically be dissipating more power than the motor. Probably 10x more for a typical stepper running on 50V
really ancient drives just used huge power resistors
a line operated step drive done this way would be pretty decent performance (at least in the winter when you needed the heat)
pcw_home, but if you vary the voltage only then you can never go over the steppers rated voltage can you ? (the 2 phase VFD thingie) =)
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you vary it in proportion to speed
so it may be 2V when static and 100V when spinning fast
the PWM step drives effectively do the same thing, vary the 2 phase drive voltages such that the average current is right
mm i guess theres nothing wrong with it, it works but the sound is awfull ... still got to good hearing :P
[20:20:49] * fragalot runs his 2V rated stepper motors at 24V
PWM drives are virtually silent
nor they, nor the driver warms up
my drives i can hear
i ran my 2a steppers at 3a :)
chopper drives hiss like a snake
a faint pweeeeee
better PWM drives run at 50KHz or more
r00t4rd3d, i run my 4A at 4.2 ..closest i could get to 4A :P
Machining underwater would be so much more convenient for cooling.
But I have noticed that stepper motor design amongst the dolphin community is lagging badly.
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I am writing a high-speed serial interface for the Arduino to the Mesa UART. 1000000bps.
Seems to eork, so far.
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I am using the Arduino to excite and read back angles from Resolvers, and I decided that passing the data back on a serial link was more sensible than pretending that they were quadrature encoders.
andypugh: why not slip the arduino and direc to the mesa?
How can I skip the Arduino when that is doing all the clever stuff?
can't the mesa be setup to do whatever you're trying to do with an ardunio?
classic ladder and all that
alex4nder, you see my pcbs ?
Well, yes. If I buy the 7i49 card (which does do exactly what the Arduino is doing)
taigs cuts em pretty nice ;)
But Mesa cards by themselves don't do analogue voltage measurment or sine-wave synthesis.
ReadError: no, url?
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