hmm, nobody sayin' nothin' makes me think somethin's broke
people are just quiet
i have not done technical drafting in some time
it is nice to do something that is not in solidworks
I prefer solidworks myself
I did too much drafting as a freshman in college
still gives me hives to think about it
i kind of agree, but it's nice to do once in awhile
having a drafting arm helps it be less painful
drafting arms are nice
i have one of the pantograph type, not the uber slick slide arm
still, it's nice
never really had that much space I wanted to give up for a table
never used a slide arm, just K&E
woah, new ones go for $1k
i'm afraid i have no clue what k&e stands for
kueffule and escher
that is okay@!
i need to take the rest of the technical drafting stuff at college
brand name of drafting equipment
still around I think
I butchered their name
i am horrible with brand names so that is okay
nobody could spell it, that's why you only see K&E on the products
[04:06:02] <eric_U> http://cgi.ebay.com/K-E-Paragon-Jr-Drafting-Machine_W0QQitemZ150226118303QQihZ005QQcategoryZ14017QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
funny that it's under collectables
I should sell my slide rule
the model I have goes for fairly big bucks it looks like
I bought it for $2 new at an office supply store in the early '80s on a clearance table
never even saw someone working with one, they had just stopped when I started high school
I have a small mayline drafting table which works ok, better than nothing
[04:12:47] <eric_U> http://www.mayline.com/showcase/drafting/drawing_boards.html
except back when they made them outa real wood
i am interested in that kind of stuff
how to use a slide rule/etc
you had to know how to add
slide rule only multiplies
slide rules can do a heck of a lot more than multiplication
logs/exponents, trig functions ...
ok, mr. smartypants, but they still can't add
well, if you can't add, there's not much point in doing advanced math either, is there? :P
I refuse to do math in my head, guaranteed disaster
my math teacher in grad school made fun of me for balancing my checkbook with my calculator, I asked him if he wanted to pay my overdraft fees
I chased a problem with a Kalman filter code I wrote off and on for a couple of months, realized I had made an algebra error
no more math in my head
oh, algebra is a different story alltogether
at times in my life I've been much better at doing algebra in my head than adding 2 numbers together
I should dump windows at work, I like working on linux so much better
[04:24:40] <SWPadnos> http://www.antiquark.com/2005/01/slide-rule-tricks.html
other than the background color, that's a funny page
(and it shows two ways of adding with a slide rule)
the sliderule I have can do stuff I can't figure out just by staring at it
multiplication is just adding several times in a row
sadly though, addition isn't almost multiplying once
I was reading a book about model theory, and it goes into detail about how addition and multiplication have nothing to do with each other
but everybody thinks that model theorists are a little goofy
theory, meet practice. practice, meet theory.
the trick to that web page is highlighting the text
yes, that's what I did
what could possibly be the reason for doing that?
custom CSS ftw
It would almost be better if they used the same color as the background and made you guess there was text
I was going to mention previously that you can effectively add by brute force on a slide rule, but didn't think it was worth it
no, I'd have to agree with that
it's sorta like adding with three rulers
hi, what's up?
you are from Finland ?
what are you do?
right now I'll try to make an e-stop relay card for the cnc mill
I remember your text about my machine( that it has huge throath)
tomp2: in a 3 months we're going to build laser 2,5m x 2,5m + integrated rotary table. about 2 times larger that this machine :)
will be pictures :)
micges: very nice, is this a company or school? ( someone has some money :)
got a link?
wow, i have some EDM machines with 100" travel (2.5m), thats BIG
EDM will be in near future by us:)
this week we installed EMC on chineese waterjet
oryginal program was useless totally..:/
again WOW! , post some pictures, you are becoming experts
I only adopted EMC + AXIS :P and used their combine power and flexibility and usable :)
ANy of you guys up at this hour?
micges: yes, the control software and operator interfaces from very different cultures, often do not work well. they are not bad, but 'foreign' to the user
this one was working.
from mainland china or taiwan?
once I accidentally run it in chinese :)
that was fun :D
Bu Dui! Bu Dui!
(dont do that)
don't remember name of company
has more numbers than letters in name :P
does 2.2.23 support double stepping?
I don't understand how can I use double stepping
you know what it is/does?
acemi, what do you not understand about doublestep?
of course, I should have made coffee before asking that question :) brb
for example, there is no doublefreq parameter in my EMC2
Is there a document about how to configure double stepping?
hmmm. I thought there was, but I don't see one on the wiki (he page says "this page needs to be updated ..."
man stepgen may tell you though
i need help with g-codes......anyone?
do I need to use parport reset function for double stepping?
I think you set steplen to 0, set the parport.0.reset parameter to the step duration your drives need, move the parport.0.output function to the start, and add the parport.0.reset function at the end of the thread
thanks....i'm trying to cut a 1/2" slot with 1/4"r on both ends
i got the slot but my rad are backwards
okay, have you mistaken g02 and g03?
no....it cuts the slot right and even gives me a rad on both ends
what do you mean backwards?
* OoBIGeye is confused
climb milling instead of conventional milling?
the rad is shaped like a u on top (u & d slot)
are you using g41/g42?
slot runs along y
a picture would be worth 1000 words here
oh, I think I see
what side tool are you using?
what siZe tool are you using
1/4" endmill thru .09 plate
so when you say U shape, you mean on the axis preview, right?
want ( ) getting ) (
I understand that part now
do you want conventional or climb milling?
you are probably using G3 where you should be using G2, or vice-versa
i changed the r to - but nothing changes
that hit the spot
another thing - don't use R arcs
is there a parameter as doublefreq for stepgen? I can't see it with "halcmd show param"
well, to be precise, don't use R arcs for arcs near 180 or 360 degrees
but in general, I/J arcs are less ambiguous
can't you just slap on a R on the g01's?
no, G01 is a straight line
hmm, but on the machines at work we can do a "g01 xyzR1;g01xyz"
and they cut an arc?
to get a rounded corner between the lines...
that is one weird ass dialect of g-code
acemi: read stepgen's manpage (not the pdf documentation) for "stepspace". "If stepsace is 0, ..."
? not so wierd to me :)
it's very handy if you whan't to keep speed up/dont want a gazzillion lines of code to write...
what do i use to cut a 1/4" rad ?
sounds like we need a G2/3 tutorial/calculator...
SWPadnos:is there an example of how to use a external momentary button,want an external button to do the same thing as F9 on the keyboard
OoBIGeye: EMC2 has blending, where you can tall it "blend corners, but don't deviate from the programmed path by more than P inches"
G64P0.1 for example (I think, I'd have to check the docs)
that works pretty good
ken: a tool with a diameter smaller than 1/4" ;-)
(sorry to be a smartass, but your question is unclear)
i'm using 1/4" endmills
u said not to use
so to get a 1/4" cut radius with a 1/4" diameter tool (1/8" tool radius), your tool center needs to move in a 1/8" radius
hang on a sec, I'm looking for something
the slot is 1/2"
this is not what I was looking for, but it is a good link: http://www.linuxcnc.org/docs/html/gcode.html
[16:02:02] <jmkasunich> http://jmkasunich.com/pics/gcode-ref-back-single.pdf
I thought there was a copy of that on linuxcnc, but I'm not finding it
it shows in pictures how to specify an arc - both the R way and the IJ way
i can use the ij, but only know how to cut circle, not arc
ok, let me try an example
say your slot runs from X1 Y-1 to X1 Y1 (that is the center line of the slot, and the centers of the arcs on the ends)
and you want to do conventional milling
we're not doing tool diameter comp - that is a more advanced lesson
not needed thanks
you decide to start at the bottom left, so the first cut is the straight cut up the left side
G0 X0.875 Y-1 (rapid to start)
G1Z whatever (cutter down)
G1FwhateverY1 (cut up along left edge)
so now we are at the top of the left edge, and want to arc clockwise
the final tool position will be at X1.125 Y1
and the center will be at X1Y1
we are at X0.875Y1
so from where we are to the center is 0.125 in X and 0 in Y
those numbers become I and J
so, we write G2 I0.125 J0 X1.125 Y1
look at the the drawing in the upper right of that pdf file, and see if it makes sense with what I just wrote
i don't get 10.125 what is that ?
its not 10 (ten) it is I 0.125 (letter eye)
I guess it would have been clearer if I put some spaces in there
thought i was missing somein
no it's just me new to this and i always loos funny even when i am writing
does it matter the order of the command ? x y j i ?
some fonts are better than others at distinguishing I and 1
no, g-code doesn't care
let me go try brb
jmkasunich:is it possible to have an external momentary button that will do the same thing as F9,spindle for,or R,run
jlmjvm, man halui
what he said ;-)
acemi, set stepgen.n.stepspace=0, parport.0.reset-time to the step length needed, and parport.0.pin-nn-out-reset (where nn is each pin used as a step output) to 1
then shuffle the parport functions so parport.0.write is first, and parport.0.reset is last in the thread
or, use stepconf and look at the results ;)
gotta run. bbl
just threw together a board with relays to use as an e-stop circuit. what do you think? http://www.anderswallin.net/2008/03/e-stop-circuit/
What happens if the PC locks up? Are any of those relays setup in a latching configuration?
there's no charge pump or continuous check that the pc is alive
the E-stop 'mushroom' buttons do latch, but nothing else
with analog servos, you probably do want a charge pump
if EMC were to crash while the DACs are putting out non-zero voltage, you could get a runaway
awallin: So, if you had a temporary power loss (loose wire) etc, Could any part of the system re-enable itself when power is returned?
In .ini file which created by stepconf, HOME_LATCH_VEL (50) is greater then HOME_SEARCH_VEL (0.05). is this normal?
I'd say thats a stepconf bug
JymmEMC: yes, if EMC doesn't detect the loose wire, then the e-stop board would power up back to normal
acemi: what is the scale on the axis that gave you those funny LATCH_VEL and SEARCH_VEL numbers?
from what I see, the scale defaults to zero
scale is _always_ machine dependent, you gotta change it to suit your motors and screws
is this an inch machine? or mm?
for mm is 20
when you ran stepconf, were you using inch numbers or mm numbers?
wait, wtf? 8000 for inch and 20 for mm? one or the other is wrong
if you have 8000 steps per inch, then you have 8000 / 25.4 = 314.96 steps per mm
if you have 20 steps per mm, then you have 20 * 25.4 = 508 steps per inch
I started stepconf again, for mm, axis sclae is 20
I run it only for trying and I used the default value
you're confusing me
the value of 50 for LATCH_VEL is what you will get if you use 20 for scale
ok, so when I asked you what you used for scale, why did you tell me 8000?
because I don't remember the value and I started a new stepconf
the calculation for LATCH_VEL is designed to make it move at one step per servo period, thats why when scale is 20 steps per mm, the velocity is 50mm/sec
that gives you 1000 steps per second, and since EMC is checking the switch 1000 times a second, it should be able to get the result accurate to 1 step
(actually, I think I would have set it for 500 steps per second, or less, to allow for lags)
SEARCH_VEL on the other hand comes from the user (I think) and should be fast so homing doesn't take forever, but not so fast that you go flying past the home switch and crash into something
only the machine builder knows how fast that is
the 0.05 you saw when you ran it is the default, you need to replace that with something that makes sense for your machine
normally I don't use stepconf, this is my first try
the weird results you got are because the default SEARCH_VEL is very low (for safety, you need to change it to suit your machine), and the SCALE is very low (20 counts per mm is only 508 counts per inch, most machines are 10000 counts per inch or more
mr jm..been trying to write the other end of that 1/2" slot...i just a circle
acemi: thanks for calling the odd LATCH_VEL to our attention - I just checked in a fix that will be in the next version
ken: what are you writing? paste the G1 that precedes the arc, and your arc command, into this window
G2 I0.125 J0 X1.125 Y1 then g3 i.125 j0 x.875 y-1
ok, I'm confused again
why two arcs in a row? are you doing a straight slot?
inbetween those codes is g1y-1
an arc on both ends
ok - I asked you to "paste the G1 that precedes the arc, and your arc command"
anyway, I see the problem
have you looked at the arc drawing in that PDF?
note that the center of the arc is offset from the start position by I and Y
by I and J
your start position is X=1.125 and Y=-1
your I value is 0.125, so the center of the arc is at X= 1.250 - thats not where you want it
I should be -0.125, that will put the center at X=1
thanks my jm...that's it
got to go now...wife wants grass cut :)
thanks again mr jm later
hmm, grass cut? he must live somewhere warmer than here
he lives in south louisiana
you cut grass 12 months a year there, I know
jepler_ is now known as jepler
Calif too... all the rain making it grow big time
Me... I just can't find enough salt to kill it all
just spray roundup as you mow...
BigJohnT: too expensive for the area - I reserver roundup for minor control,
I need to kill off about 2000 sqft or so
you can get the generic now it's 1/4 the price
salt is cheaper
50# for $4
and less toxic too (for such a large area)
makes the deer lick your whole lawn
salt is semi-permanent tho - round-up breaks down and you can replant later
I bought 200# of salt last time, I need to see what their min order is for delivery - sometimes their hard to get ahold of on the phone
jmkasunich: That's what I'm looking for, that semi-perm aspect.
Guys feel lucky ... least you're not vacuuming up termites today like I am
termites? Thats a WV bug I thought.
people in wv too poor to have termites, they've moved on
nah, we've prolly soent $400 on them things in the last 15 years
I looked up SEIG, and sent them a plea for a complete sschemtaic opn that controller.
I looked up SEIG, and sent them a plea for a complete schematic on that controller. Damn these ancient fingers
what did they say, "ask gecko"
That was late last night, I don't expect an answer much before monday evening
Humm, theree is a stick on it that says "FC150BJ110V" I wonder what google might upchuck for that?
WV thing We got termites in GA too ...
humm, google pleads no hits
I looked up fc150 stepper
no obvious hits
And this isn't a stepper, its a VSR, used for spindle control in the Seig Super X1, aka the micro-mill
that would change things, dc motor?
Yes, PM field type. I now have relays doing everything nthe rev-off-fwd switch was doing but now neither the PMDX's pot, nor the original can control the speed, its wide open ewhen enabled.
yew blew the scr?
Not scr, MOSFET
it controls the mosfet so itss not bad.
besides, I looked it up, its a 20 amp 500 volt mosfet
The schematic isn't complete, none of the fancy stuff to control the speed is on it, just arrows pointing to A, B & C
C feeds the opto-isolators that drive the mosfet
you sure the high side mosfet's not blown
Yup else the motor wouldn't run at al;l.
they short sometimes
In which case I should have power at the relay to the motors when the realy is off, I don't.
I take that back, I do have power to the motor if I bypass the run relay in series with it. Humm, but if I open the connections on the PCB's #6 & #7 terminals, it goes away even with ac power on it.
So maybe the mosfet is blown...
and getting it out of there is gonna be fun, my solder suckers are up at the transmitter. Damn.
Yeah, its toast, gate/src is 14.9 ohms either polarity, gate to drain is 19 ohms, either polarity
Now, whereinhell do I find an MTW20N50E ON semiconductor mosfet?
Yeah, I guess you do. Us old CET's occasionally jump to the wrong conclusion...
that's why you need to keep some mechanical engineers around
Chuckle, but I are one of them too, whyen there isn't a real one around.
So, I'm gonna go warm up my diqabetic feet & see if I can find one on the house machine.
diabetic, dammitr fingers type what I tell ya huh?
I thought newark sold on semi, but I guess not
[19:55:59] <SWPadnos> http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=1376381;keywords=20N50
I dint' know vishay and rohm made mosfets
I like the fairchild version with no specs
[20:00:44] <SWPadnos> http://www.fairchildsemi.com/ds/FD%2FFDA20N50F.pdf
too bad mr. Heskett isn't even here to see your mad searchin' skilz in action
his client is still connected :)
not at the house
eh - he can see it once he gets too warm and goes out to the shop again ;)
it isn't important until tomorrow anyway, since DK isn't shipping today
JymmmEMC is now known as Jymmmmm
cradek has changed the topic to: Welcome! EMC (Enhanced Machine Controller) is a linux-based opensource CNC control. | Latest release: EMC 2.2.4 | http://www.linuxcnc.org
dang, my machinery handbook is at the other shop and google searching makes my head hurt.
anyone have the formula to find leg lenghts of a right triangle if you know the hypoentuse the angles?
and the angles
law of cosines?
or the law of sines
no, it's easier than that. if it's a right triangle the legs are H*sin(a) and H*cos(a), where H is the hypot length and a is one of the angles
law of sines/cosines is for non-right triangles
ah apparently I skipped over the right triangle part
well there you go ;)
BigJohnT: you only need the stuff in this Overview section for your problem
cradek: is the google master
that the page from the machinery handbook! thanks Jymmmm
Jymmmmm: are you answering trig questions now!? congratulations
cradek: oh hell no
I thought you were the guy asking them, not long ago :-)
cradek: I never know the answers, just where to find them.
that's just as good.
now if I only know thw cmd to start a new window in screen
thanks! you forgot to tell me the cmd to switch back (but I found that - I think =)
cradek: see what I mean =)
Sweet! I love it when a plan comes together...
Jymmm your making me dizzy
SWPadnos: do you use minicom?
EMC for scanning tunneling microscope, anyone?
anyone know how to connect to a serial device in nix?
don't even know what nix is...
JymmmEMC: try kermit, or just cat /dev/ttyS0
echo 'foo' > /dev/ttyS0
fenn: it's a managed switch, I'm trying to console into it.
use kermit then
apt-get install gkermit
fenn: Done, but how do you connect?
oh sorry, it looks like gkermit only does file transfer?
you could try minicom
fenn: I got asked about EMC for 5 axis xray machine today.
The weird part was the xray sender/rcvr was a semi-circle that moved in a semicircle ( like a circular rack with pinion).
looks do-able if feedback can be mounted without hacking insides ( mfctr wont agree )
it's just positioning
[23:36:17] <tomp2> http://www.gehealthcare.com/usen/xr/int/products/oecneuro.html
sorta of Z X C A and dont know what to call the circular rack
JymmmEMC: yesterday's FreshMeat http://freshmeat.net/projects/serial-io/?branch_id=71601&release_id=273577
tomp2: i think you'd have fun building an STM
it's like EDM without all the nasty stuff :)
[23:49:18] <fenn> http://www.angelfire.com/electronic2/spm/index.html
brt does it cut metal?
unless you consider stacking atoms up to be cutting metal
cool, thats bookmarked :) thx fenn ( pretty funny 'amateur scanning tunneling microscope' )
like 'amateur nuclear physics'
i wonder if emc could handle doing PID for the piezo's controlling tip height
dunno, we could look at some peizo amps and feedback systems
there was a guy doing piezo hexapods
PI was the company
btw there is an open source STM software <gxsm.sf.net>