I made a rotary step-up once, that was semi-successful.
But I am thinking more in terms of Arduino, voltage-doubling circuit and power gates.
I also have a 7kw variac that can boost 240v to 280v
but I think the beave requires 13kw
I have already made a 300V BLDC motor controller, and you don't need to handle that tricky encoder feedback with an induction motor.
I think i made an ebay mistake
My cheap servo motors have cost me £650 so far for a machine to fit them to, and I have hardly started.
i always wanted a mill with an atc, and i didnt realise how big the nc5 actually was
what servos you have?
Some Lenze 500W ones (£50 for three of them)
No connectors though, and there are two per motor at £18 each...
best deal i ever found on ebay was 3 ssd 635 servo systems for #40
does your beaver use these weird pull studs? http://www.practicalmachinist.com/vb/general/beaver-nc5-pull-stud-dimensions-153752/#post886850
two of the amps were blown, but 1 was working so it made fault finding easy
i heard that nc5 had weird pull studs, but i dont know what the ebay mill has, i bid without seeing it
that could be a real thorn in your side
very stupid, but i though i would not win it, and it was worth the initial bid as scrap
its an iso40 taper, i would think it possible to turn some pull studs on the lathe?
They are not the same shape as the 90 degree variant normal one, but I wonder if they are compatible?
the problem with pull studs is their hardness/brittleness is critical for safety's sake
they're about the last part you want to make yourself
"About" the last.
last part of your tooling certainly
Making a gripper/collet is probably even sillier.
[00:12:03] <andypugh> http://picasaweb.google.com/lh/photo/y7DmfyRa6U7VFXB_71JfzQ?feat=directlink
andypugh: did you do that?
(I am quite pleased with how that came out
so that pull stud gripper hardened?
did you send it off to be heat treated?
Not that one, it is made of key steel (0.45% carbon). I will probably make one out of O1 tool steel if it is successful.
the finish looks rough
The finish is fair, it isn't very big.
damn, its past 1am, where did all my time go?
I was going to make it then slit it, but had a better idea. I gripped 4 pieces of square material in the 4-jaw chuck, fitted a collar, shuffled it out, machined the OD, then held it in a collet to machine the internal features. Then machined off the collar and separated the leaves.
Can you machine O1 with HSS tooling?
Is it difficult? I am concerned about my spindly little boring bar
if you can keep the hole clear it'll be fine
(It has to fit down a 7mm hole, then make a 2mm undercut @ -15mm. That doesn't leave a lot of room for actual boring bar
it makes sharp stiff strings
I do have some lovely little mini-boring bars but they are too little, and I don't have a holder.
I do like this demo video, where they are boring half of a circle and have synchronised the camera so that you can see it. http://www.hornusa.com/fileadmin/user_upload/media/supermini_105.flv
Ah, not a great link.
Try the "Film" link here: http://www.hornusa.com/products/grooving/
mplayer can do it...
andypugh, that is a freaking great video
I think I will rethink my 3-phase converter, the driver I have is really only wanting to play with 450V, and rectified, doubled, mains is going to be 600V.
yikes what are you trying to run?
My milling machine
the manual one?
does it have a bunch of 3 phase motors or something?
It's a 3-wire motor
if it's just one spindle motor, why not a plain old vfd?
I might have to swap the motor for a rewireable one.
Plain old VFD costs money. Quite a lot of money for a voltage-increasing one.
oh is the motor 480 or something?
440 phase-phase is 600 peak-to-peak
So the 450V driver won't be happy.
Well, probably not. It's £20 to find out.
yeah - too bad it can't be rewired - I'd toss it in a minute and get a 240v 3ph and vfd
Thing is, the motor is wierdly flange-mounted in the machine base. I can see swapping it (and finding a suitable old BS flange being tricky.
anyone here have a cheap and easy opto-interrupter they like to use for limit/home switches?
I like the focussed refletive ones.
Because they are focussed anything more than about 2mm 0ff-axis is ignored.
I have a bunch of these as limit switches and as the lathe spindle encoder: http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=4550931
My milling spindle is using these: http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=4550880
anybody here that build a plasma CNC cutter?
my father in law saw my VNV router, and he was thinking of building a plasma cutter... I am wondering what should I consider when buying a plasma unit..
ries_ is now known as ries
OH YEAH BABY!!!
Jymmm: you have experience with the plasma stuff?
ries: Just THC
Jymmm: I know I need it.... but that was my main interest not yet... that's done by sound, right?
I cannot even begin pronouncing that word..... :)
I remember one day when I was buying skunk for my girlfriend, after that I went to teh super marked.... trust me, better was doing that the other way around :D
ries, no way
you always end up with a much more creative dinner if you smoke then shop
$10k for a citzen swiss screw machine
shit, we could have gotten three of those for the price of our shitty new haas
my car just got stolen off the parking lot
i chased after them with a flashlight not entirely sure what i was hoping to accomplish
DaViruz: shine a light one him?
shooting him would be more satisfactory
ok, maybe not
nah, you would have at best gotten blood all over your car
did you get the number of the car? the police can identify the criminals from that (pre coffee logic)
my car was stolen 3 times in the 2 years it was running, it never went further than 1/2 a mile
the big red cross painted on the bonnet made it easy to find
I don't lock it any more, so at least I don't have to replace the glass or bend the doors back to shape anymore
ries, Albert Heijns has the best coffee. stand there and drink 2 cups before making purchase decisions. it helps
I miss Dutch supermarkets. I mean, how civilised can you get? help yourself to cup of good coffee in the middle of the shop
MattyMatt: hehehe... I like to grind my own coffee.... that's way better then that machine stuff
it's nearly all instant coffee here. douwe egberts comes in 150g packets
nescafe is considered high class
its funny you miss dutch supermarkets.. i miss bread everywhere i go abroad
bakerys seem to be unusual in most areas
we have very few now, but the big supermarkets do have in-store bakeries which is a plus
roh: omg, send me some schwarzbrot, and some roggenweckla
MattyMatt: now if they only had bakers too....
they do. experts in baking 10 different kinds of fluffy white bread
roh: I know... I make my own bread nowdays, I hate the supermarket stuff.... every other day I make one bread...
I try not to be precious about what I eat. There's a war on, dontcha know?
sawdust? luxury :)
* MattyMatt converts breadmaker into materiel
the police have promised the olympics will be bombed if we don't give them $150m. sounds like a protection racket to me
and a cry for attention. I won't be watching if anything happens
except the ladies volleyball
i guess the most hard to find component to 'replicate bread' is getting the dough
eh.. yeast for making dough
i guess that could be complicated to handle in.. eh.. different climates
theorb_ is now known as theorbtwo
Fox_M|afk is now known as Fox_Muldr
* jthornton and momma are off on a bike ride :)
My troublesome machine seems to have forgotten how to thread again.
that's no good
btw, talked to my boss about not grinding the ways, but he explained some stuff that makes the $22k grinding job seem worth it afterall, and based on all quotes, price seems to be "typical"
It does seem colossally expensive. I wonder how much a brand-new bed is?
OK, off to try threading again with the latest patch reverted.
that i do not know, nor do i know where you would buy such a thing, the "CNC" ready, manual lathe looking, linear way sporting machine was $8900 fotp
ekke is now known as ons
andypugh: what patch was that if you think it's the cause for the "not threading"
our mill starts to miss spindle orientation for toolchange again, too bad it can't be explained with a patch gone wrong ;P
any other newbies to emc here?
morficmobile how is the spindle orientation supposed to be kept?
Eina_: on this (still fanuc controlled) mill, a index pulse on the spindle
index until when? does it have a switch or something to tell it its aligned? Not that I could help, I'm new to cnc and especially emc
I was just randomly blaming cradek, but it looks like he is off the hook.
It still isn't working.
I _thought_ that the spindle position was reset at the beginning of each threading pass, but I am not seeing that.
andypugh: always good when you have someone else to blame :>
I am puzzled, to be honest.
no encoder belts on spindle slipping, like in companies where preventative maintenance is done too late? ;)
The encoder is directly mounted on the spindle pulley.
like the toothed belt we replaced was rather smooth looking
It used to work OK, I am not sure if there is a hardware problem, a software problem or an operator problem.
well, the operator can only kill threads if he changes offsets (Z deadlier than too much X) or changes rpm after he already started, or changes Z start point after he already started, so that's easily ruled out
speed and feed overrides should be ignored by the control.....
andypugh: sad thing is, anything i could think of you likely already checked 2 more things for that i never had to look at before
As I mentioned, I know nothing of cnc's but on all the other machines I've ever worked with, if something works and then quits, its usually hardware and most probably a loose connection,broken wire,dry solder ect
You might be assuming far too much about how much fiddling I do with this machine, and I am running a development version of the code while writing my own bits.
Eina_: unless you run a development version of a control
I really should button up the "working" machine and leave it, I suppose.
andypugh: yes, you should, unless it's not important if it runs :)
It's not _that_ important.
I have just ordered another PC for dev work.
oh, ok , then you'l have to wait a year or to before I could try to help you out
Eina_: Most quadrature encoders have an index pulse that occurs once per revolution. I think (not sure) that EMC2 uses that index pulse in the threading cycle. Perhaps one of the experts here will confirm or refute that.
I've just installed my seperate pc with emc yesterday, don't even have a clue where to start with it, but I'm learning
Do you have any hardware to run?
so spindle speed slows down until the controller recieves the signal from encoder then it stops?
Eina_: play with the simulator?
Yes ( sort off) I've build a 4 axis foamcutter on wich I want to try it, but there is a lot of reading,ect to do before I went so far, I just moved my main pc over to ubuntu 10.04 2 weeks ago
I haven't had time to play with anything yet
Eina_: No, spindle speed never changes (during threading), the system watches the spindle rotation and keeps the Z motion properly synchronized. X too, for that matter.
ok that does make sense for threading, but how does it know when to stop for auto toolchange, I understood that the problem was at toolchange
do I ask my "dumb" rookie questions here or is there some place else for that?
EMC (as do all CNC controls) follows some program written in g-code that says what is to happen. What happens at a toolchange (M6) depends on the machine.
Well, EMC2 comes with several manuals, so that is a good place to start, but, yes, you can ask questions here. You might have to wait for someone to answer, though.
this is one of the most responsive open source project channels i have ever been in (not counting distro channels, but the noise to signal ratio is very bad on those)
Eina_: Have you seen this really cunning EMC2 foamcutter? http://www.cnc-hotwire.de/
Just EMC2, 4 motors and some string.
I saw it, but can not understand the language, mine have two axis left and two axis right with a bow, at this stage my main problem is setting up emc in that config as all off the info I've found so far are related to mills and lathes
A foam cutter would normally be an XYUV machine.
But yes, you will need to edit the config files by hand
tnx - that was one of the dumb questions I would ask
Simplest is to create a mill config, then look at the HAL and INI files and delete the Z references, then clone the X and Y into new U and V
would the g-code be written in xyuv axis also for something like this?
tnx, now i've got a start
You could do clever things with kinematics files to it was X,Y and two angles, but that is a bit advanced.
the Hal and INI file get edited with a text editor
The INI file probably needs to be told that there are 8 axes, and you would setup U and V in the INI to be [AXIS_6] and [AXIS_7] and reference those in the HAL file to get the step scales and velocities etc.
(the axes start counting at zero, I htink)
OK, off back to the workshop. Be back later.
why 8 axis if there are only four?
you skip the unused ones
from what little i understand
like axis z?
the ini setting tells EMC the number of the "last" axis (from XYZABCUVW)
you then use a different setting (COORDINATES I think) to say which ones are actually used
Any good linux software for generating g-code? (CAM?)
not for hot-wire foam cutting
there are various options for other tasks, with varying levels of usefulness
[14:35:02] <SWPadnos> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Cam
darn, so I'll have to start up the xp machine again
Eina_: run XP in virtualbox in ubuntu? :)
jepler- is now known as jepler
It's not realy so bad, I still have the laptop with xp on, had 2 week battle to get the network working
thought it might be more convenient
got really good help in the ubuntu forum with that problem, now I know how great and valuable open source are, wish I had the knowledge to contribute
at this stage I've got al 3 computer standing next to one another, at this tempo Ill have the cnc machine in the sittingroom by next week, wonder what the wife will say
tnx for all the help
* foxtrot high fives itheos
foxtrot, sorry I kinda fell asleep the other night when I was in the middle of talking..
alex_chally, its alright, i was falling asleep too
get anything cut properly yet?
sometimes i get lucky
i think i fixed my torque issue by upping my motor driver current tho
foxtrot, iwas thinking the other night that your Z axis problems might be caused in part by your table not being level
if it was not fairly perpendicular to your Z axis, it would cause irregular cutter engagement
i did build my table myself by bolting 2x4s to a plywood board which i screwed a plywood outline to
foxtrot, is it flat?
but i do have *a lot* of weight on the Z (.75" MDF support on the dremel)
the flattest thing you probably have in your house is a piece of glass
try putting a fairly large one (maybe a shelf from your fridge) on the base, and see if it rocks around a lot
also if you have a level, check the level of the table relative to the surface it is sitting on
you mean like on top of the plywood between the pipe frame(the machine)
that is, compare the level of your XY table to the levelness of the table the entire machine is on
you are using acrylic as your actualy working table, right?
well i think its acrylic
i got it out of a dumpster
behind a glass shop
check to make sure that acryclic is flatish with the bit of glass or a level
foxtrot, it just happens that most modern glass from a factory is pretty damn flat
I have a random bit laying around here that i checked on a surface plate as being flat to within .002" over 16in^2
* Jymmm read that wrong! lol
Jymmm, how so?
the level is saying it is pretty flat
the table and the x/y surface
i need a big marble to test for real tho i think :)
foxtrot, I was just trying to make sure we were barking up the correct tree, and that your issues were with homing and code more thenanything else
alex_chally: I saw "random bit" and immediately thought crypto.
i picked up a psu today
and a parport header for connecting many lose wires to :P
alex: yeah homing and code are my issues entirely i think, the mechanical/electronic operation of the machine seem fine
anyone memorize what tolerance a internal metric thread is when no tolerance is given? 6H6H or 6H6G? (I know pitch diam. tolerance is 6H, is minor 6H or 6G when nothing is specified?)
If you look at a newer $20 bill, On the front, look at the "20" in the lower left corner... Between the 2 and 0 there is "20", and in the hole of the zero, near the top is "USA". then to the right of the zero is "THE UNITED STATES OF AMERICA 20 USA 20 USA".
Machinery's says H is standard... if I read this correctly
in my large print edition of Machinery's Handbook
JT-Hardinge: i was looking for M30x3.5 6H and went to print the sheet in Thread Disk, but it surprised me to have choices for minor diameter tolerance size (6) and location (H) which it changes with the length of engagement
* Jymmm hands JT-Hardinge a 48" frenzel lens
is it just me or is it odd that my emc-computer cant load a usb stick but the same one installed ubuntu fine?
JT-Hardinge: Now all your books can be LARGE PRINT =)
frallzor: what's it formatted as?
morficmobile: goony goo goo
this be very odd
seems odd that ubuntu would limit support for chipsets
eject and remount?
tried it all
but it works fine everywhere else
No, I mean the command eject
aswell as physical "eject"
you said WAS fat?
what is it NOW ?
yes then I tried the others when It didnt work
those normal ones
well, what is it RIGHT NOW?
Then you need to use ntfs-3g to mount it =)
and now it is FAT32 again
my other usb worked fine with same
no need to do stuff
but I misplaced it today
so now I have no sticks that works
then dont buy stick sticks and reformat them with 30,000 FS's!
its brand new :P
[19:58:13] <alex_chally> http://vimeo.com/12317623
time lapse video of a sheet metal factory
lets see if the bastard will live now then!
morficmobile: Isn't the internal a lower-case g?
hmm it sees the usb stick as a dvd or something
is it a U3-enabled USB stick?
I dont think so
those act like a CD and flash drive until you run the utility that tells them to behave like a normal piece of flash
ill run it and see if it finds some U3 shit
just open the "CD" and see what files are there
it wont open
if there are any
oh, well in that case nevermind
see you later :)
ubunty sees the "drive" but it cant mount it correctly it says
andypugh: here it uses upper case for both internal pitch diameter and minor
andypugh: so i get up and get my "Tabellenbuch Metal" and it does not agree with ThreadDisk's pitch diameter.
andypugh: i declare threaddisk's dialog to suffer from "too much information" and stick to what it opens with, it shows 6H, and pitch diameter is all i usually care for, just hard to ignore overloaded dialogs right away ;)
other memory, same brand, same result =(
andypugh: hm, a bore is H and a pin is m (from a H7/m6 combo used on dowel pins) wish i remembered threads as much
Got a quick question for you G Code experts. According to the User Manual, G80 cancels modal motion. In laymans terms, what exactly does that mean?
I would have to say that cancels modal motion ie you are no longer in G0,1,2, or 3
if you program a G81 canned cycle, every X and or Y after that executes the same drilling cycle, G80 cancels this and X and Y moves after that no longer get drilled
any of the canned cycles, just using G81 as an example what G80 cancels
So it just applies to canned cycles, or does it cancel other things besides?
it does say that it is an error to program any axis words when G80 is in effect
its a paranoia thing
its usually in safety blocks at the beginning of a file, or its done at the end of every g80 series string of commands in computer generatoed code
but programming a G0/G1/G2/G3 should cancel it anyway so in a sane program i dont think you ever really *need* g80
So if I'm not using canned cycles I probably don't need it in my safety block? I've coded it in there at the beginning of the program
if you ever hand edit code its not a bad idea to just leave it
just in case
icaro_ is now known as icaro
I take it that it won't hurt anything to leave then, and the G0 - G3 codes will cancel it out.
Mines a somewhat simple XZ axes machine, don't have any real need for canned cycles.
i dont think any of the pcb drill file i edit i ever use g80 after the XY coordinate blocks
i just G0 up to clear height and G0 to XY clear point
if i was writing some script or whatever to generate drill sequences, i would put a g80 at the end
just to make debug sessions a bit less dramatic
wendtmk: keep in mind the default is G64 so if your G0ing up and over an obstacle then EMC will round the corner... the amount depends on your machine
JT-Hardinge - Thanks. Hadn't considered that. I'll read up some more on that section.
morficmobile: What does your thread thing say about the M14.6 x 0.6 thread I just decided to use?
I'm getting better :) it only took 3 tries to hand code an arc in G18 upside down plane and G7 Diameter mode
wouldn't 4 tries involve a repeat?
oh no I've tried 25 times before without any repeats LOL
and it is clear to me now that my 5C holder needs a deeper pocket
Or, perhaps the owner needs deeper pockets?
I'm holding a 5/8 thick 2 1/4 diameter 6061 part and I made the pocket 1/4 deep and clearly I could go up to 7/16 now looking at ti
Looking at Ti leads to much expense. But it is nice. I bought my digital camera almost entirely because it was made of Ti
you want a stepper for mockup and testing layouyt, what do you do?
you mill one i wood! scale 1:1 :P
*mumbles something about nerds ... *
frallzor, we have a bunch of protofoam that I am going to be testing my brackets in before I mangle the alum/steel
the stuff is pretty amazing, especially because of how well it maintains it's dimensional accuracy
* alex_chally has never played with the wax
I have cibatool but its too pricey to play with
frallzor, all the stuff we have is donated, I am sure it costs $$$s because the teachers generally would rather have us play in aluminium
[22:36:05] <frallzor> http://forumbilder.se/show.aspx?iid=d22010123538A0755
frallzor, do you not have the motors yet?
I do but theyre on my machine
dont want to pull one off just to try =)
yeah, makes sense
I don't know how I would od my conversion without the machines at school
it seems that you need at least a manual knee mill and a lathe to make a CNC kneemill/lathe
maybe you could do it with a lathe and a drillpress but...
I converted my machine using itself. It did involve a lot of assembly and disassembly. And milling the underside of the cross slide was kind of ugly.
andypugh, yeah, I mean I could do the work on my Y axis nut holder and stuff just kinda moving the table around by hand without the screw and using a dial indicator and an incredible amount of fear
just lock everything down real tight when it is time to cut
Yeah, that's what I did.
Those USA-ians go crazy for Kurt vices, I believe? There is a 6" x 20" one on eBay for £40
[23:03:34] <andypugh> http://cgi.ebay.co.uk/A07-1248-KURT-DLK600C-6-x20-5-H-GROUND-MACHINE-VICE-/170497997121
but all the jaws are missing...?
I have some shitty $120 new vise, it is... not so great
I am not sure that it is all there..
that's a double vise with fixed jaws in the center
cradek, the real magic is in the screw and clamping mechansim, making a new set of jaws for it would be pretty simple if you have a surface grinder
That odd arrangment is the jaw clamp/pulldown thing?
but those ones are usually used with softjaws cut to hold a jig or a one off
Ar you saying that that is actually useful?
andypugh, yeah, I am not quite sure how they work because I have never taken one apart, but they manage to impart most of their clamping force in the downard direction, pulling the work down into the vise
andypugh, they are worth every penny
I have a friend in Coventry....
a new 6" kurt is about $650 USD new
the single anglock is $400
andypugh, here is two of those vises for $2500
[23:07:21] <alex_chally> http://cgi.ebay.com/Kurt-DL600C-double-6-vises-/150451812281?cmd=ViewItem&pt=BI_Tool_Work_Holding&hash=item2307a077b9#ht_500wt_1154
you can see what is missing
there is some magic going on at the interface between the moving jaws and thosehooks that you can see on the one missing them
but I think it is just a mating angle
so that pushing forward makes them pull down
The "magic" is clearly a loose roller.
(Or an angle, yeah)
yeah, I am almost certain the moving jaw just has that angle cut in the bottom of it
hmm, kind of an interesting cut actually
easy to do on a bridgeport style mill, but I wonder how they do them in the factory
Fox_Muldr is now known as Fox_M|afk
The price they charge? With a dremel and blue.
huge mofo molding forms =)
those cost a load
Does anyone know if polystyrene is acceptable as patterns for iron casting. I have decided that the CNC conversion of the Harrison has to be at least as nice as the original, and that is going to mean iron castings. (which are a lot cheaper than you would guess)
surely you'd need to ask your foundry