jepler: how are you holding the boards down?
dimas: the queue is a just a list of things that need to get done.
the problem is in the handling the queue.
in milling it's clockwork, (7:00 be here, 7:01 be here, 7:02 be here)
but in edm its 'be on the path according to the gap' (12V be here, -1V be back a tiny bit, +2V fwd but slowly...).
so, both are time sliced, but in milling time determines position, in edm the time is just the gap sample rate,
and the position is dependant on last position and gap voltage error to some threshold.
(may not be the most robust description)
constant rate vs process limited rate
not limited, thats what was wrong with the previous emc edm attempts
the rate must be bipolar
jmkasunich: sticky tape
do you ever mill anything besides PC boards?
going slower than the process is just a way to get 'stabile' ( really to get sluggish )
jmkasunich: not really, no
ISTR you have a pattern of threaded holes in the table?
if you do a moving average of the direction, would there be sufficient space to back up and not hit the other side of the kerf?
yes, but a perfboard (sacrificial material) on top of it
now that the CIM jigs are done, I'm finally trying to get serious about building a PCB mill
I'm going with the moving bridge approach
the rail I have for Y gives a little over 9"
I don't doubt you'll have the knowledge to do it
hm I wonder if I've ruined this sensor
what kind of sensor
either I've got my software wrong, or it never drives the pin with data
temperature sensor (DS1620)
microcontroller drives clock, both take turns driving data
thats the kind of thing that wants a logic analyzer
fenn: thats wedm, (kerf) and a moving average isnt used, the present gap (now) determines the correct velocity and direction (now), no history is used. edm is high accel and usiually very low velocity
oh thats where the other computer is... on the email
SWPadnos: u there dood?
is there any way to use a serial port from hal?
either serport (which uses the DTR & co pins as DIOs)
or you can write a small component that talks the protocol you want
I need a component that gives me a package with a byte of data
out on the port
here's an example
[08:27:31] <alex_joni> http://cvs.linuxcnc.org/cvs/emc2/configs/plasma-thc/mp1000_serial.py?rev=1.1
I have a python program in userspace doing it now
yup, sounds about right :)
though it's a bit slow
there is rtserial
but I've never used it
and it's picky about the serial controllers it can talk to
might be better to get a faster comp
you need to look at RTAI docs for that
I'm going to make the plc control ignition and gas valves and stuff
I need a way to monitor flame though
good mornin all
now this is unexpected .. not really ;) http://www.theregister.co.uk/2009/03/30/microsoft_kills_msn_encarta/
hehe maket dominance dont ya luv it
specially when the boot is on the other foot
[12:04:31] <MrSunshine> http://www.youtube.com/watch?v=F0TjS0N0rwc&feature=player_embedded
<-- first test run of my stepper driver =)
MrSunshine cool! is that a pic driving it?
Whats up man?
just got to work
I just got done cleaning these oil soaked amphenol connectors.
my servos and encoder all use them but they are soaked in cutting oil and shorting out so...
Are you running a servo system by chance?
yes but not emc
sweet, what size/type servos you running?
yaskawas and panasonics
I have a couple Glenteks, and some magmotor servo, all using tachs
Working on a X/Y table for my single spindle barloader.
I been trying to catch SWPadnos in here so I can thank him for all his help again :P
dc brushed motors and analog amps?
care to see what I got so far? (just posted a couple short vids
good stuf, actually better at low speeds ( sub rpm ) than the fancy ac stuff
yeh, id like to see
[13:25:45] <UncleG> http://vids.myspace.com/index.cfm?fuseaction=vids.individual&VideoID=54858345
nah I should tho huh?
there is one more of it in action right after this one
you leave it on myspace and put a link on the wiki
haha i use copleys too on big baldors m55's
they seem pretty solid
got 2 of them for $17 on ebay
[13:29:12] <UncleG> http://c2.ac-images.myspacecdn.com/images02/57/l_fb264e951b114044b08ec7d0b0ed8521.jpg
there is the x/y Im building...
42x series? up to 170Vdc and 30amp peak
now all I need is leadscrews.
I dunno what the specs on them are...
is that ribbing on the top of the dovetails? ( was that dovetails? )
the V grooves?
I am working with these http://www.electronicsam.com/images/KandT/DSC_0242.JPG
those are big...
ah v grooves, what are they for?
those are what the slide...slides on
damned accurate too
The T slot is where the tool will go and the motors will drive it forward and back and side to side on those v grooves
less friction less surface, didnt think itd be 'full' contact there. some nice t slotted tables have that, so the work slides easier
dovetail? (dont see the giveaway slant sides) or some kinda box way?
its a box style that holds it
nice, it can take some pushing and hold geometry then
yeah, It's actually alot short now, I basically took two really old manual profiling slides, cut them way down and attached them crossways to achieve a small solid slide setup
the travel is only about 3 inches both ways
just enough for most screw machine parts
such as fittings and other oddball shapes
so, are you using mach or something?
Just this once .. here's the log: http://www.linuxcnc.org/irc/irc.freenode.net:6667/emc/2009-03-31.txt
skunkworks_: we want a video of that thing actually moving a table
or blowing up
yes, that'd be fine too
I will probably get both ;)
* archivist expects a hole in the roof from the exploding capacitor
that is with the pluto set to 95%duty cycle
I had the thing stalled at 20a for around a minute just playing around. (that poor motor is only rated for around 5)
when you kill the motor that way, saw it in half and post pics of the melted innards
heh - this is a conveyor motor - it seems to be underrated.
devices barely got warm
I think it would make a pretty decent servo.. Doesn't seem to cog at all.
SWPadnos: since I can never catch you on here maybe you'll see this and read up. I damn near have my cnc finished, all I have left is to install lead screws and work out ratios =D thanks again for all the help..btw I got a video and a couple pics above)
you caught me - I'm skipping out on a talk from Ken Mattingly
Did you happen to see what I got so far?
no, not yet
I'm on the road, so I haven't been on IRC regularly the last few days
well, whenever you do, just think (heh that dood wouldnt been anywhere if I never gave him a few tips here n there)
oh, I always think that
err, never :)
I think your subconscious is talking for you
gotta get more coffee I guss
wakes up the conscious
man I got 4 heavy duty bei encoders on ebay for $20 the guys posted that as "encloders"
one is an absolute encoder....
like 8000 lines or something... I don't even have a use for it...
I got a nice new Mitsubushi VFD because it was a "Variable Frequeacy Drive"
for $100 or so (1.5 or 2HP, don't recall)
are absolute encoders pretty expensive compared to incremental or about the same?
very very expensive in compairsion
I dont even know how to use it with EMC so it doesnt do me much good..
sadly, they're also unsupported in EMC
I think I will post it back up on ebay
it would be possible to write a program that reads the encoders and writes the POSITION.TXT file
lol the one I have is listed at $520 :P
but "homing" would probably have issues
I got it for $5
if you can use (or sell) it
got any buyers out there?
there is a slick lil cnc shop down the road Ill call em up
I can think of a use but postage to here
my only use for it would be to add support to EMC
a good use
trade something? :)
but since I have a set of 3 Yaskawa motors/drives/encoders, I don't need any more at the moment :)
I would like to send the rotary to an absolute position
the only thing absolutes do for you, and this is only if you have battery backup, is remove the need to home the joint
I don't even know how they work, and I really cant see myself needing one for anything...
once you read the initial position, they (often) are used as incremental encoders anyway
note that they don't always track motion when de-powered - or at least not all types do
I just called the guy at the cnc place, he said he'll do a swap for a servo :D
skunkworks, cool... cant quite read the meter... could be all the smoke!
hi, i have purchased a mini cnc with steppers, now i have compiled emc and the system hangs when i test the axis
the system goes to hell
i can't move even the mouse
were you using another version of emc before you compiled it yourself?
what version of Linux, and more specifically the RTAI kernel, are you using?
and kernel 2.6.19-7
the module rtai-math didn't install, but i put it by hand and there is no error message
do the rtai tests succeed?
there is a liveCD available from the linuxcnc.org website, have you tried that?
i can do the latency tests
but if the latency tests are made from emc then the system hangs
are you on a 64-bit system?
no, a pentium 3
also, were you following the wiki instructions (there are a couple of relevant pages, one called RTAISteps, another InstallingEMC2)
here i have a error, hmmm
error opening /proc/rtai/latency_calibrate
when doing a test from console of latency
oops - Installing_EMC2
yes, i followed the wiki more or less
heh. try more, see if it works ;)
ok, i will come here if the situation is desesperate
you might want to try the liveCD. even if you don't end up using it, you can at least test our kernel on your PC
yes, but the computer doesn't have dvd nor cd
if that doesn't work, then there may be issues we can't help with
can i put it in a usb stick?
skunkworks did that at one point, following some other instructions he ha found
you already asked that :P
thx guys, let's try
[18:39:26] <SWPLinux> http://www.pendrivelinux.com/usb-ubuntu-804-persistent-install-via-the-live-cd/
something on that site may help, maybe even that page :)
others listed here: http://www.pendrivelinux.com/tag/usb-ubuntu-804/
oh hey, lunchtime. bbl
I really doubt if a pentium 3 will boot off of a usb stick
the system doesn't hang now
but it doesn't work
i have noticed that i can not put the dma on to the harddisk
and the system corrupt some files with emc, it has corrupted /usr/bin/basename and with this corrupted the system hangs in emc, i have copied basename from other computer and now the stepconf doesn't hang it test mode
also another thing i have seen is that in stepconf i put 2000 in direction setup and the system puts always 20000 when i return to this screen
perhaps the motors doesn't work because of this. :-?
opsss, one axis is workingggggggggg
it's the first time i see a cnc, you can understand my happyness :D
once u have z/y/x axis running, you should hook up an e-stop switch
escape key in the interim :)
yes, when this thing works
only axis Y is happy
hehh good description
time to cheer up X and Z then!
ok, all works now, it was the enabled in the other axis were negated
i'm going to test emc now
How is everyone today, good I hope :)
where can I find documentation on the latest version of ClassicLadder?
[20:00:33] <BJT-Work> http://www.linuxcnc.org/docview/devel/html/
BJT, thanks for the link
hi! For the G-Code in the example folder, are they suppose to run at all? I mean on a real machine. I've been getting the "exceed limit" error. But I am sure the samples uses very small footprint.
FaxModem: you might need to touch off before you run them
actually, I got confused about that too. What's touch off?
is that the same as finding datum on the real machine?
homing = tell the machine to search for switches and/or index pulse to determine its absolute position
touch off = set a local origin point for a workpiece
wait, so if you click home, the machine should move to find home?? my doesn't do that. and I used stepconf to set it up. ;p
only if you have home switches
oh. my doesn't. OK. good.
no motion is another way to home the machine. if you have no switches or index, you will have to jog the machine to the home position and then click home.
[20:12:23] <BJT-Work> http://www.linuxcnc.org/docview/devel/html//gui_axis.html#r1_3_5
I have max min limit switches.
you can home to those then. the options are in stepconf.
you can home in MANY different ways
I see I see. Let me read more then.
I was thinking I can run the sample G code to see if things run OK.
let me read more first. :)
is zero a valid value for the touch off?
* BJT-Work wanders off to work on his tractor
talk to you guys later
FaxModem: certainly 0 is valid
humm. my machine only asks me to touch off x coordinate
oh... I need to do it all three times.
OK, let me go try. Thanks cradek!
I need to go offline because my wireless connection doesn't go to the shop.
often you need to move to a different location to touch off each axis
that's why it only asks one number at a time
I see I see.
but the sample code should run, at least move the machine right?
if it fits inside your machine .. sure
but it also depends what sample code you loaded
i am pretty sure it should. :)
if it's some lathe code for threading, then maybe it won't do anything
I am loading the simple "logo" one.
ah, that one should work ;)
I think the EMC2 AXIS.
I think... i can't remember. ;p
only if it fits and you have the origin set right
OKOK. So it is a procedure problem. Not the set-up. Well, at least it doesn't look like it at this time.
Let me go try. :)
Where is a good place to post info on my machine when it starts to work? In the forum?
sure, or on the mailing list
the wiki or mailing list
there is no forum
just give us a url!
FaxModem: depends what you want to post :)
picture and sample config.
I am trying to do a 5-axis machine. but doing it one step at a time.
I can use some input when I get the head-head axis installed.
FaxModem: one step at a time sounds sane
OK, let me get back to the 3-axis. when it moves, I'll post something. I hope you guys like it. and I can use more help on the last 2 axis. :)
good night all