any bridgeport/clone experts in here?
i was on here earlier, won one on ebay
going to get it on thursday
not sure much, i think it might be a J head from looking at pictures of other people's, but not really sure what that exactly means either
its an "exacto" brand
exacto or excello
exacto i think
"Exacto vertical turret milling machine"
j head iirc is the step pully head, not the varispeed head
[01:12:24] <dareposte2> http://i20.ebayimg.com/01/i/001/38/b9/8b97_1.JPG
[01:12:50] <archivist> http://www.lathes.co.uk/excello/
i knew it.
xlo made high volume production machines iirc
but a bport clone is pretty much a bport clone, unless it's one of the high end brands
modern high end brands
archivist: do you have one of them?
is archivist a real person or a bot
archivist is a real dude.
ask him about books sometime.
i thought the link seemed highly pertinent for a bot ;-)
I run a bot! but am not one
well thank you for the link archivist
mine is a 9x42 table
as tall as i am, but weighs about 10x more
pretty standard size, i'm glad you didn't get the 32" table
you'll be happier
i didn't really mean to get it, but i had made a low-ball offer a couple days ago and he accepted it today
thrilled to death though
can't wait to get some servos on it
gonna put ballscrews on it?
yeah i think so
X and Y for sure
i'm not sure how Z works with a screw, maybe needs some research
i guess a gas spring or counterweight or something
z is the quill on a bport, w is the knee
oh i didn't know that
on machines with a good rapid clip, the W axis has a gas spring usually
but i've never needed it so i'm not really sure why it's included on some
i was thinking it would be fine to just lock the quill and run W as Z
w is really slow.
and is not as accurate, linerally, as the Z axis
not that it matters much on a bport.
it's not a jig borer, but if you want to argue technical semantics.
it should be a step up from my Jet bench mill
for both accuracy and stiffness
although the Jet was surprisingly okay for what I expected
the worst is one of those sieg X2's that I got
i was going to make it cnc but i didn't want to throw more money on it so I just gave up
i mean it's not really fair to compare any bench machine to any floorstanding machine.
yeah i know
i may still make the X2 a PCB router or something
since i have a ton of smallish steppers from ebay years ago
do you think it would be best to go straight for ballscrews?
or maybe see how the leadscrews do first
backlash means careful gcode to do unidirectional cuts
i wonder if 1" ballscrews would be sufficient
archivist: I need a book on finishing metal products :)
I had a batch come back for tooling marks which were "positively unacceptable!"
you cannot climb mill if you leave the leadscrews in
and you have to pay attention to which way the mill moved last.
heh that can be tooling, speed, machine, .....
oops i see archivist beat me to it
surface finish is an exercise in homongeny
polish it up a bit afterwards
i was like... whats the big deal so it has a bit showing how it was turned
apparently that's not acceptable though
if your parts are visible in a product, they usually have to be pretty, but not very accurate
what are you trying to finish, by the way
they were accurate to within half the stated tolerance, but just a bit of tooling marks
its done now, i just ate the batch and remade it with a finer finish pass
303 doesn't finish too wbell
yeah i noticed
coolant, and an unfortunately high speed with a shallow depth of cut
and the obviously slow feedrate
that's what i did when i went back and "fixed" the finish cuts
although one time when i was cutting 303
our shop has some pretty fine grit wet sandpaper that's really aggressive3
i just did a slow feed pass, the surface was ratty, but it was all visual and the paper left a really swank matte finish
dunno what brand/type, it's just a stack of this paper sitting out
finish turned and polished both showing http://www.collection.archivist.info/archive/DJCPD/PD/2006_09_07_pendulum/P9072700.JPG
thanks for the pics
haha that's a really cool part archivist
how'd you polish it?
wet and dry
1000 grit probably
i was on a loaned laptop
archivist: can you send that pic again?
three pics of cast iron pendulum
took ages to machine
carbide tool for basic finish then wet and dry
i like the lathe too
damned cust has never sent pics of the finished clock!
but he got busy just after we delivered that part to him
lathe is swiss Shaublin
archivist: nice pendelum, was it two pieces?
toastydeath: you still around here
well, i am now
hello, any ideas how to debounce an AC contact. it drives a contactot and sometimes the contactor chatters. google gets me lotsa dc/logic solutions
toastydeath: was wondering if you thought it looked like a series 1 or what
tomp: use a keep / break circuit
also it is a series 1
okay so that's good since i want a vfd on it anyway
well at least not bad
what does a vfd have to do with series 1/2
tomp: you might want to make the contactor self-latching to eliminate the bouncing
toastydeath: doesn't that have to do with changing belts instead of speed adjuster?
that's the J head.
so it's a series 1 and a J head both?
I'm pretty confident most, if not all, series 2 machines are all varispeed
they only have head nod, no tilt
maybe thats where i was confused then
and also add like 2k lbs of metal
better stick with a series 1 then
series 2 == much bigger machine
this one will allegedly give me 30" x 12" machinable area,
seems pretty good sized for a garage mill
so on the J head is there any big problem with selecting a mid-range pulley and hooking up a vffd?
sure, you're going to have problems with torque and overspeeding
you'll def. get a good range, but don't just leave it in the middle.
if you need a low speed, take the two seconds to change the belt speed and give you either the torque, or the rpm that you need
and then obviously fine tune with your vfd
it says 8 speeds, 80-2700 rpm
you might, might get away with just switching it in and out of backgear
i'm thinking of how to cnc it
cnc'ing a bridgeport to the extent of a machining center is not a useful endeavor
i'd suggest x/y ballscrews, MAYBE z
and that's it
hand select speeds.
really... why not just have a vfd and let it run the programs
like i said, you're going to need real low rpm's sometimes
and leaving it in the middle of the bport speed range will not get you there
there's not much power in that machine, you do have to juggle it
facemills, flycutting, tapping
so no big ac drive for me then
i mean if you really want to experiment, go for it?
but just don't get your hopes up.
varispeed is the best - only thing you sacrifice is no auto speed changes
but for milling, you only change speed when you load a tool - on these machines the tool load is manual anyway, so who cares
i was hopeful that some of the new vector drives would be pretty good torque at lower speeds
I run out of torque drilling at low rpm on the lathe (I have the varispeed set in the middle and use the vfd)
not much choice - no other way to get css
but on the mill I don't see any reason not to use the varispeed - it works perfectly
they are both 2hp motors
I've drilled a lot of 5/8 in steel with the mill (full size in one drill) - woo
he's got a j head, the pulley type
so it's not quite as nice =(
might find a varispeed on the cheap though
i've seen the heads go for not too much, but i have to wonder what's wrong with them
yeah, no kidding
even so, like you say, worth it even with some repairs
how tedious are belt changes?
yeah thats what i was looking up
trying to find a video of a belt change on a "j head"
youtube has failed me
cradek: i'm not picking it up until thursday, so i'm not sure
if its too tedious it may get a spindle upgrade
if vfd won't be satisfactory i'm not above an ac servo
a 5kw ac servo and timing belt would probably be satisfactory for most uses
maybe overkill :-/
|dareposte|: rule of thumb on induction motors, VFD OK down to 15-10% of rated RPM, encoderless vector down to 5-3%, true vector down to 0%. Always read drive manual. YMMV.
doesn't sound too bad if it's constant torque below rated, and constant power above
but to toastydeaths point i guess changing the belt would still give more torque just from the gear reduction
i'd like to have enough spindle control to do tapping with it
why don't you buy a small vmc instead?
Yes, hard to beat that geardown (beltdown?) torque gain.
it sounds that's what you really want
and it's designed to do what you are talking about, and the bridgeport is not
i just have this strange feeling you're going to wind up spending the same amount of money building a frankenmill that isn't anywhere near as capable
* KimK reading back to see what |dareposte| wanted to do...
but like, if you like goofing around, i don't want to crap on that
because it WOULD be cool to do
i like the flexibility of the bridgeport
and goofing around
i just want to make sure you're aware of the downsides in addition to the cool stuff
i did look at small vmcs but they tend to be either tiny, or huge
I must have restarted while you were chatting. You really want a table top mill?
no i already have a couple of smaller mills
i won a bridgport clone on a lowball offer at auction
and am probably going to make it cnc
Great! And the problem is...
there are swank bed mills by Mori Seiki and Matsuura that are like, 30x20x20?
they take up more floor than a bport, but ANY vmc will do that
mostly 80's vintage, re: the 30x20's
weigh more too
not more than that lathe you were looking at, though
and less floorspace
But that's not the machine won on the low bid?
KimK: i won one on ebay
|dareposte|: The Bridgeport clone, right?
right its an "exacto" brand 9x42
OK. And toastydeath, you were saying?
[03:43:26] <|dareposte|> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=200318469116
kimk: i dunno
what was i saying?
toastydeath: i backed off that huge lathe partially because of the expense of installing and moving it in the future
Well, that |dareposte| should get some other machine?
from past conversations we've had, my impression is that he's going to be making products with these?
maybe a time will come when i have space and equipment to handle that size of machine, but until then it might be wiser to stick to smaller stuff
in addition to having fun learning/messing with machine gear.
What did you recommend for |dareposte| ?
an 80's vintage matsurra or mori seiki, the bed mills without an enclosure.
toasty: i have a turned production i want to do eventually
just a cute lil rail around the table to keep some control over coolant.
OK, thanks for catching me up
id like to have the mill cnc'd mostly for hole patterns, profiling, and other assorted fun things
maybe cut an occasional piece of die tooling on it
if I was cncing one of those from scratch, I'd try to motorize the knee for Z and leave the quill for manual use (drilling and power tapping)
|dareposte|: Congratulations on your win, BTW
thanks, didn't think they'd go for it
cradek: really? i was thinking the opposite
In this economy, you never know
* KimK needs a snack, brb
dunno - quite a tradeoff - you couldn't get much velocity or accel on the knee I bet.
but a manual quill would be so nice to have.
cradek: the ones I've seen have had the knee be fixed and the quill be powered
by fixed i mean manual
sure that's how BP made them, but their CNCs all have a bigger quill made for milling
I think these heads are normally used with the quill up for milling
is the series 1 quill too small for milling with it extended?
I think it's just mostly there to make drilling easy
you should ask someone who's used one a lot - mine has the other head
yeah i was hoping someone on here had one
i use JUST ENOUGH quill
toasty seems to know quite a bit about them
so that i can get the endmill to clear the part rapiding about
i set the stop so that i can clear the part when i'm at full depth on the knee with quill up.
what about going to like a drill or reamer then?
lower the knee manually i guess?
OR CNC BOTH
yeah that could be nice
there was an old bridgy cnc that had all axes under control, but i never used it
you would still lose the manual quill though - I'd hate to lose that
with a quick disconnect for the manual quill then :)
i think, don't quote me on this, but i think there are some CNC heads that replace the auto feed mechanism?
but not many
so you can click it out and get your quill back
i could just be dreaming
way over my head
sounds neat and entirely possible but I haven't seen one
i'm not planning on doing any major production on this thing
|dareposte|: your mill has an auto quill feed FOR BORING ONLY DO NOT DRILL WITH IT JESUS
good to know
light duty i guess
it's like, .0015/.003/.006" per rev
for fine boring
yeah very light duty
auto quill feed for drilling = lean on handle
There's a bed mill here that raises and lowers the whole head (Bridgeport head), so that they retain cradek's manual drilling and tapping quill. Also, the quill auto-feed stuff still works. Otherwise, the quill is not used.
i once drilled 1" holes in copper, my "auto feed" was me hanging off the handle at 100 rpm
i am a 230 lb dude
and even then, it could have used more
gravity provides and oddly constant feed rate and chip consistency
G81 F2.0 ...
sorry my connection crapped out for a minute there
yeah it's hard to improve on the drill press
TWO drill presses
really that was probably how the idea for the gang drill got started
i burned up my drill press
"dudes this is a pretty neat tool, how can we make it better"
then somebody made a joke and look where we are now
i decided it should be able to drill 2.75" holes in 1/4" plate steel
and it disagreed with me
"nay, good sir"
* toastydeath fire
oh, still no
those things just suck
it got through 6 of them before the stench of magic smoke became apparent
we drill little dinky 2" holes in steel and it's a 15 hp cut
not even a super aggressive feed rate
so that's where i was thinking a cnc mill might be handy to have, cut or at least rough the circles out
drilling a hole and cutting with a hole saw are totally different
different in the same way that playing jump rope and orbital re-entry are different
cnc mill (with ballscrews) can make nice round holes
you can make big holes on a manual mill too - takes more fiddly work (and a boring head)
i have a boring head
didn't really want to start with a 1" and work my way up though
no no no
_dareposte_: trepanning with a boring head.
not like, boring with a boring head
in 1/4" steel?
do the layout circle, mill it out
that would take years
(move the table in a roughly circular fashion inside the lines)
or what cradek is saying
then finally make it round with the boring head
oh yeah that would have worked fine too
I've seen it done when they only had manual machines at work
boring heads are not adjustable drill bits :-)
in soviet russia, hole drills YOU
i bored the bearing blocks for my current lathe starting at 1/2" and working up to 30mm
to a shoulder
maybe not the best strategy
sounds very tedious
it was horrible
at least a 1" end mill would have helped
the best strategy on a lathe is to yell "WARP SIX" to confuse your co-workers, then engage your lathe at some enormous depth of cut
obviously this only works with large lathes
and co-workers who don't watch star trek, but i digress
cradek: i don' tthink a 1" end mill would have helped in this case
rotary table? I dunno
sounds like you needed SOMETHING else :-)
horizontal boring mill
[04:06:04] <_dareposte_> http://www.harborfreight.com/cpi/photos/44900-44999/44991.gif
<--- what i was boring on
i tried to flycut the block when i was done and stripped some gears
a true hero
amazingly it did all line up within a thousandth on the concentricity of the races
it may make a good pcb router one of these days
but no more milling please, not on that
i upgraded slightly later to this: http://www.amazon.com/gp/product/images/B000051WSL/ref=dp_image_0?ie=UTF8&n=228013&s=hi
which is decidedly better, but still somewhat lacking
that looks like it would be a decent drill press (sorry)
[04:09:55] <toastydeath> http://machinetools.com/MT/machines/index.tmpl?page=detail&ListingID=123049203618782049
there you go
I need that lucas
i think we all need that lucas, two of them.
actually, I want one of the little benchtop horizontals
cradek: it does make a good drill press
they had a heuuuuge Van Norman at Penn State Surplus years back
they make benchtop horizontals?
There are benchtop horizontals?
yes there are
what has science done
they were hobby machines I think
is that lucas a "jig borer"?
_dareposte_: boring mill
horizontal boring mill, not a vertical boring mill, which is actually a lathe.
the moore jig borers I've seen look like monstrous drill presses
tabletop (sort of) horizontal mill: http://www.industrialsurplus.com/photos/077-306.jpg
lot of bicycle framebuilders have little horizontal mills for mitering tubes
cold saws won't do that?
oh, i thought you meant a tabletop boring mill, not a tabletop horizontal mill
i was going to be like :o
I see the confusion
a small boring mill is any one where you can only fit 2 people on the table at once
what do they use those for??
seriously that's ridiculous
_dareposte_: they are the predominant milling machine for large parts
[04:16:26] <jmkasunich> http://jmkasunich.com/cgi-bin/blosxom/shoptask/wichita-trip-02-20-08.html
they're accurate, and ultra rigid.
look at the last two pics
especially the very last one
what lucky fellow gets to tram all those vises every day?
bolt em' tight enough, and they stay in tram
btw, that is MPM, stustev's place, where the EMC fest is going to be in May
that man does a lot of 5 axis stuff
i have noticed
that is very nice indeed
man, big machines =(
when i switch to another shop i don't know if i want to look for big work, or accurate work =(
i can't decide
big accurate work?
jmkasunich: Since you have been to MPM, how does it compare to Roland's as far as space to host, meeting/class rooms, swapfest space? etc. ?
well like, i still have those phone numbers and emails from the dude who worked on the LODTM, and some vendors and companies and stuff
so that kind of accuracy
or big/accurate stuff in the giddings & lewis sense
KimK: it won't be like Roland's place
no swapmeet, etc - there simply won't be that many people I don't think
and it _is_ a working shop - we won't be taking over the whole joint like at the workshop
I'm not sure what area stuart plans to use for classes
the main shop has a modest sized meeting room between it and the office area
and there is another building with less activity in the back
we were only there for a long weekend...
OK, thank you. I was just curious what it's like there. I hope to attend.
I'm planning on it - have to work out a few details yet
[04:31:57] <toastydeath> http://www.practicalmachinist.com/vb/showpost.php?p=1084178&postcount=47
epic, epic PM post
when i touched the dc control side of the ssr the contactor chattered, added one 10k pulldown to the 24V ctrl side, and now has cycled 100x w/o chatter :)
didnt know i was pos charged ;)
haha the 'sense' of accuracy... like daylight, then press fit, then so exactly the same we cant measure the diff
tomp: So whatever you're working on is working well, then?
yep, the contactor for a 120A edm supply no longer chatters when turned off. the ssr was bouncing for some unknown reason (KYOTTO AC SSR)
putting in 10 sip res for the whole 2981 driver now
Congratulations on your fix
thx, i just saw that Aerotech has a linux front end for thier Ensemble controllers ( maybe just a terminal pgm ) but 6/10/9 axis with edm control possible, drives talked to over ethernet or rt usb
Is there a URL?
anyone know where i can get some ttf fonts that i can use in emc ?
the fonts i have now give me a double outline
and i'm only going with .1" height
like the letter L, it'll give me two rec.. one up an the other laying down
i just need the tool to make one path each letter :) thanks
ttf fonts are made of all closed paths. there is no such thing as a truetype line font.
piasdom, fenn mentioned a script and associated line fonts yesterday - have you tried those?
SWPadnos; i didn't know how to use the script
oh. me either :)
I just remember seeing it mentioned
by the way, thanks SWPadnos
oh, you're wewlcoms
well, i got the script to run, but all it does is "Script started, file is typescript"
and it created a typescript file
i wish i knew how to run this thing they call linux :)
it's not Linux you're having trouble with, it's the font converter ;)
where was that from again?
i know, but i don't even know how to run a simple script
i think you were right...from fenn
yes you do, you just don't know what options it needs to do what you want (which is a documentation problem with the script)
it would be the same if you were presented with a Windows (or Linux) dialog box with 10 places to enter text, but no indication of what that text tells the program to do
and in winz,there is NO ONE to help as with linux :)
I think you need to edit the script to change the text
i'll go look thru it...thanks again
and to change all the machining parameters
and it looks like it prints the gcode to the terminal, so you'll need to use it like this: python cxf2cnc.py > myfile.ngc
the__goat is now known as the_goat
SWPadnos; i tried it and got python: can't open file 'cxf2cnc.py': [Errno 2] No such file or directory
where is cxf2cnc.py located?
no idea..or if i even have it :)
i'll do a search
well that's the script that fenn mentioned
I thought you had run it and gotten something unexpected
it did make a ngc file, but nothing is in it
i ran what you gave me and got the message above
but it did make the ngc file
I meant this
[10:28:15]<piasdom>well, i got the script to run, but all it does is "Script started, file is typescript"
that must be my torble, i don't have the cxf2cnc.py file
that's what i got when i ran the script
the one fenn gave me...i named it script, don't remember what his file is named
ok, if you named it something else, then use that name instead of cxf2gcn.py
err, you know :)
now i get this; http://pastebin.com/m6571ef8e
why don't you donwload the script again :)
[14:56:43] <SWPadnos> http://fenn.freeshell.org/cxf2cnc.py
it's a text file, you should be able to read words in it. it sounds like the file you have isn't the same thing I'm looking at
in the script the begining wants to import re and math...don't kow if i have these files
this is the first of five pages; http://pastebin.com/d6e461fe5
yes, that's the script I was looking at
you should have math, and I think re is also part of the base python packages
you must have python installed, because axis uses it
i have 2.5.2-2inubtu4.1 loaded
and i don't use axis
inubutu = ubuntu
if you have emc2 installed then you have python, because emc2 depends on python
i'm sure i have python
did you also download the font(s) fenn mentioned?
must have missed the fonts...i'll go look at the log...thanks
toastatwork is now known as toastydeath
toastydeath is now known as toastatwork
* BJT-Work listens to Talking Heads :)
'burning down the house'
Hi, y'all. I've got a conundrum. I want to controll a small CO2-laser that is mounted on my 3-axis router. The problem is that it needs to be able to be switched on while the X/Y-motion is at constant speed. How do I solve this?
heh. I think we were just talking about you :)
OK is Big Tom from CNCzone in here?
are you doing raster work or drawing outlines?
that's Big John, and yes he's here (but may not be at the keyboard)
that would be BJT-Work at the moment..
He helped me out a bit but we never reached a solution. I'm doing the raster-thing
I'm here Tottish
well, there isn't really a good solution at the moment
Tottish: what is your accelleration set at? (and could you up it by a bunch?)
if you have sufficient acceleration available, then you may be able to do something where each "pixel" in the raster includes a Z move that can be used to turn the laser on or off (or leave it how it was on the previous pixel)
you wouldn't be able to use G64Pn mode, since that would compress several moves, and would make the Z zero crossing time more or less impossible to control
(I'm assuming you'd be using Z=0 as the threshold for turning the laser on/off)
The issue is - for the outputs to be turned on and off - the naive cam detector (combining line segments) doesn't come into play. So emc has to 'touch' every line segment. For it to do this - it also has to be able to stop at the end of each line segment if needed. So upping the accelleration would work as one solution.
if I am understanding it correctly.
The problem is that I'm pretty much maxed out when it comes to acceleration. 500mm/s^2 is about as fast as I could possibly go.
I'm pretty sure you're right about the acceleration-'fix' because it seems to work fine at speeds under about 500mm/min but thats way to slow with a stepover of about 0.5mm...
What about PLC? Would it be possible to have the PLC read a value from a textfile, compare it to the DRO and execute a command (ie toggle a pin) when they match and then get te next value from the textfile?
I'm thinking about the softPLC... "ClassicLadder" is it?
I really doubt it
Tottish, if you want to get down and dirty that way, you should look at halstreamer
The fastest that ClassicLadder can refresh the rungs is one millisecond. You can put it in a faster thread but it will not update any faster.
* BJT-Work goes back to making 6061 chips
halstreamer can update an output every base period, but it can't be clocked by motion at the moment
either adding "tracking" to halstreamer, or making a component that can output a pulse every "X" change in position (assuming halstreamer can be externally clocked - I'm not sure that's there at the moment) might do what you want
the bottom line is that EMC2 isn't capable of running a machine like this at the moment, and won't be without some programming effort going into it
looks like mach can only do vector also.
Yeah, sounds very complex to me. My programming skills does not reach out far from microcontroller-programming.
oh. then HAL should be easy for you ;)
Right. =).. So is HAL like a language in its own or what?
it's the hardware abstraction layer, and the way it's set up is like electronic components you'd place on a PC board and then wire up
so you don't have to make a giant monolithic thing to do what you want, you can make separate pieces that wach do something simple with a few inputs/outputs, and then you wire them together to get the effect you're looking for
other than some housekeeping work (telling the system what connections and functions are available), you're more or less doing the simple task of "check inputs, do the work, update outputs"
OK... Can we just talk about the PLC for a moment longer. Is it possible to do what I said earlier with the softPLC? 'Cause 1ms responsetime sounds OK to me. Or is the PLC unable to read the DROs?
Someone told me it was a pretty basic task for the Mach3 softPLC...
I don't think there's any way to get a list of numbers into classicladder
which is what you'd need - either a list of turn-on/turn-off positions, or a list of the required laser state for each pixel
Optic: and Tottish need to talk lasers :)
OK, I see, therin lies the problem... But this list would be quite possible to access from the halstreamer?`
cat must be on the keyboard
i've been wiring a little java program that turns a bitmap into a combination of G1 X moves, M64/65's, and then a G0 X0 Yx to move to the next "line"
i haven't tested it yet though
go RLE compression :)
OK, but how will that help? I mean the problem isn't generating the code, it's getting EMC to execute it the way we want, right?
i've heard that 2.3 can execute M64/65 without affecting G1 motion
why is there this flurry of laser users lately? did a new cheap machine become available?
cradek: not in our case
we got an old machine that we've rebuilt
we got a machine with broken/missing electronics and redid all the controls
I don't know, I bought a cheap CO2-tube from LPF.com and hooked it up to my CNC router. =)
Tottish: is that the correct url?
Optic: Have you tried it in 2.3? Anyne else? BJT didn't seem to think it would work. If I understood correctly.
i haven't tried it
but I will this week
No, sorry LaserPointerForums.com
I think we have some weird resonance in our mechanicals
certain feed rates make very innacurate work
Optic: if you are not microstepping - you may see that.
we're not. should we be? half-steps?
are you full stepping? then half stepping will help - but may not solve the problem
you have hear it vibrate in strange ways and the laser makes a zigzag line :)
we are full stepping
s/you have hear/you can hear
we've never seen the machine run under the original controller so we don't really know what it's supposed to do / sound like / etc :)
yeah, skunkworks is right, never full step
I'd seriously think microstepping to get smoother motion
yeah - at least try half - it might be good enough
i'll take some macro photos of the output and post them when I'm at the lab next
you an really see where it vibrates
cradek: you have had good luck half stepping - correct?
yeah, it's fine
we don't have software control of the motor current
but we can easily change teh step sequence
you can half step with even the most trivial of drivers
1 12 2 23 3 34 4 41
right now we're just doing 12 23 34 41
you're controlling each phase? cool
stepgen has all these modes plus even more that you'll never use :-)
also 123 234 341 412
we have a PIC doing the stepper control
stepgen is doing type 0
3 coils on at once?
oh I doubt it works very well...
i should do more research into stepper control
but half-stepping should be easy
yeah, really do try half
do a search for resonance and stepper :)
Optic: have you managed to get any decent results when engraving with a few shades?
woohoo! it almost worked
I was finally able to get Altium Designer to run in wine
the problems showed up when I tried to actually display a PCB
ew SWPadnos getting that stuff under another system is fun, I know my old DOS version complains a bit
where the Designer part of the name comes from
both owned by Altium now though :)
shows how long Ive been using it
they named the executable "dxp", maybe in honor of the protel legacy
started playing with kicad
nowhere near yet but on the way
when it can do FPGAs, and automagically transfer pin swaps between the VHDL/Verilog and the PCB, let me know ;)
and also automatically optimize FPGA pin functions based on component layout, to minimize routing crossovers
I wish the devs would notice I started #kicad
tottish: we've been doing pure vector only so far
Optic: OK, do you usually hang around in this channel? I guess we could help each other out since it seems we are facing the same challange.
toastyde1th: this is optic on cnczone. http://www.cnczone.com/forums/showthread.php?t=75237
fenn; you around ?
Tottish: ^ that was for you ;)
fenn; how do i use the script you gave me ?
fenn; it looks like the type font i need
python cxf2cnc.py > myfile.ngc
and you edit the source to change what text is displayed, the font style, etc
fenn; source ?
cxf2cnc.py is the source
fenn; typing above i get no encoding declared
did you edit it with a word processor?
fenn; first line #!/usr/bin/python
use a text editor like gedit or kwrite
fenn; gedit can't open it..i'll try kwrite
fenn; "gedit has not been able to detect the character coding."
well i don't know what you did
best to just download it again
also FYI you can't use unicode in the text to engrave
fenn; ok...but don't know unicode from unicorn :) thanks
fenn; when i got it the first time..i had to copy-paste it to a doc..is this right ?
never ever use a word processor to do anything related to machining, except perhaps writing documentation
word processors add all sorts of things to the files, like font choices, margin settings, page layout ...
but it's just a page
take a look at the file size
copy it into gedit ?
you can make a one-word document, like "hello", and it will be much much larger than 5 or 6 characters
you can probably copy from a word processor into gedit
no file size...just a web page with the script
don't copy from a word processor
you are using Linux, right? (to download)
type this in a terminal: wget http://fenn.freeshell.org/cxf2cnc.py
when i type this "http://fenn.freeshell.org/cxf2cnc.py"
as the url i just get a script
that should result in your having the unaltered code on your machine
yes, that's what you want
you can then save page as ...
and save it as plain text
gedit can open it now...thanks
thanks fenn and SWPadnos...got it
fenn; is there a formula to scale the font ?
fenn; it starts a one, but how big is that in the real world ?
about 1 cm letters, you can change the "scale" variable to resize them
the fonts are all different so you can't just say "make a 1cm letter"
fenn; so fo do i figure it to get a .1" font ? (i use inch)
fo = how
you need to select a font, generate output, look at it in AXIS or something that lets you see the size, and then change the scale to make it the size you want
as fenn said, fonts may be different sizes, so there's no easy way to calculate the scale for a given size
is this running in metric ?
it makes no difference since you can adjust the scale
you may need to edit the file though, if it puts in the wrong G20/G21 code
ok...i'll look for that
near the bottom of the script, you can see that it prints "G21"
i changed that but the number were still mm(6.43)
so make the scale 1/6.43
[18:35:27] <piasdom> http://pastebin.com/d18ac661e
reading about microstepping
that was just one of the numbers in the ngc file
piasdom, you have control over the scale. the only difference between metric and imperial is a factor of 25.4
so if you would have used a scale of 1, then you now need to use 1/25.4
if you would have used 2.54, you now need to use 0.1
SWPadnos; ok thanks
in the script the start(0,0) is lower left, but in emc..it's top left,is this suppose to do this ?
you are mistaken that in emc the origin is at the top left
gcode is a RH coordinate system
isn't that what i said ? (top left)
it is not top left
positive Y is up on the screen and away from you on the machine
movement down and to the right
yes y +up -down
y stays negative and x positive (trying to get my meaning aross correctly)
and X is even with the left edge, but Y is a little above the top edge
this is what i get; http://imagebin.ca/view/udJtWt.html
then use touch-off
i usually use mini...used axis to show what i had...don't know touch-off :)
then I guess you have a problem :)
piasdom, change the xoffset and yoffset values in the script
apparently those change the placement of the text
ooahahhaha guess so
SWPadnos; thanks,but it doesn't change
is the G-code different?
SWPadnos: for some odd reason his file doesn't have x[*] positions, but rather hardcoded values
no, it doesn't
so offsets & scale & such won't work
but the script adds xoffset and yoffset to all the numbers when it generates the G-code
[19:33:33] <SWPadnos> http://fenn.freeshell.org/cxf2cnc.py
i figured you'd use G54 if you needed to do offsets in g-code
I thought I remembered that it outputs x [#1 * value] positions maybe
that is cradek's script
skunkworks: shush :P
stop being so helpful. sheesh
i found this ; http://pastebin.com/d200a6fa6
skunkworks: oh, indeed ;)
thought piasdom is still using ttt
piasdom, at the top, where you (hopefully) changed the feed rate, the Z plunge depth, and other stuff
you change the lines that say "xoffset = 0.0" and "yoffset = 0.0" to some numbers other than 0.0
alex_joni: I know what I am talking about 1% of the time. :)
SWPadnos; oh,..i hcanged the 0 to -0 )
skunkworks: we all do
the trick is to shut up the rest 99% of the times ;)
speak for yourselves
I've got to be at 2% by now :)
alex_joni; don't know ttt
maybe it's better if you don't :)
-0 is still 0 :)
skunkworks: weee another 1% moment
I am on a roll ;)
mathematically, -0 and 0 are the same, but I think they actually have different representations in IEEE754 floats
which is very useful if you want to get -INF instead of INF when you divide by 0 (or -0) ;)
i got emc2-sim working in virtualbox, yay
that's almost 2 infinities of difference
* skunkworks is nodding and smiling.
* Optic is bopping
meat beat manifesto in my headphones
[19:55:42] <alex_joni> http://failblog.files.wordpress.com/2009/01/fail-owned-verizon-fail.jpg
i had to offset y by +10.6
well, it works now :) thank ya'll so much
cradek: lets go ride http://i47.photobucket.com/albums/f163/johnplctech/HPIM1988.jpg
I need to drag mine out... it's almost warm enough lately
it's 75 and clear here
it snowed here today :/
BJT-Work: is that you?
alex_joni: yes it is neat, sat navi, xm, heated seat and grips, 45mpg
hahaha heated seat
hmm.. my car does better mpgs :P
lol @ converted car washer
almost no cars in the US get 45 mpg
few get 30. I bet most get 18-25
my 1991 honda CRX gets 40MPG, they havent improved at all in the last twenty years?
be sure to keep it :-/
you have the wrong sized gal as well
I get mid 40's
people, prepare your sharks
[21:24:30] <alex_joni> http://www.theregister.co.uk/2009/03/18/100kw_raygun_barrier_falls/
bosses new car does 45-50
i'd arther have an electric car
our toyota gets around 36 on a good day.
I would also rather have an electric
fenn: if it's a 91, soon it will be a pretty good candidate for a retrofit
just as soon as it croaks (like my cnc mill)
especially if it's non-power steering, brakes, etc
like my 91 toyota mr2 was (which I should have kept for this purpose)
heh: "A British robot submarine ... was powered by tens of thousands of ordinary D-cell batteries"
seems they used about 4t of batteries for 6 dives under the arctic ice
the only car I know of in the 40-45 mpg range is my wife's new Honda Civic Hybrid
* BJT-Work takes the long way home today...
talk to you guys later
drive slowly :)
* Optic hears supertramp in his head
you'll get better mileage
* BJT-Work hears Leon Redbone in his ears
BJT-Work: got 57mpg the other day, had to drive about 50mph to a nearby village :)
alex_joni: is it bigger than my motorcycle?
a bit ;)
which is a related car "sort of" to the thing the boss has VW Passat
bet that's a tiny bit more than on your bike
archivist: indeed it is
it's mostly VW stuff inside, for half the price
is yours diesel
* BJT-Work is really is going for a ride now :)
archivist: yeah, the low-power 1.9 TDI
I think boss has the high power 130
that one has poorer mileage ;)
and having driven it a couple of times its way faster than my Ford Mundano
they sell fords in england? i thought only americans were stupid enough to buy them
two or 3 factories here
there is one even in .ro
a factory I mean
good night all
toastyde1th is now known as toastydeath