MarkusBec is now known as MarkusBec_away
elmo401: of course!
ewlsey Hi Nice write up on the User defined coordinate and tool list topic. How are you feeling about the responses?
calcite : Now that I have a system that works it is not really a big deal. It just seems odd to me to have to remember to use G59.3 for tool setting
OKIt will become familiar soon enough
I don't know the inner working of other controls, but I assume that they are doing the same thing I am but it is hidden inside the control
Perhaps I should make a wiki page on my method
I'm trying to give away a band saw if anyone is interested http://www.practicalmachinist.com/vb/machinery-sale-wanted/free-band-saw-203145/
full documentation on any electronics system can be difficult to get, and even more difficult to make use of.
We are in an era of information overload
when I was in college one of my professors used to say that when he graduated he thought he knew 90% of everything there was to know about engineering, but now that he was in his 60's, he felt that he didn't even know 1%
I feel like that pretty often!
If I could, I would restrict myself to a "need to Know" status, But I cn't ;-) Nice "kit" saw. I have an old oliver that I got in about the same condition. Now refitted and set up with a VFD it is SWEET!
I used leather belting for tires, contact cemented onto the wheels. That was 15 years ago, still look like new ;-)
I thought it would be possible to convert it to a metal saw, but the wheels are stamped steel and I don't trust them with higher torque
wow, this is crazy expensive! $100 just for an add-on to do text?? http://store.carvewright.com//product.php?productid=16151&cat=252&page=1
It's a direct drive saw, so changing pullies is not an option
you can buy band saw tires, enco has them. but leather sounds just fine
calcite: isn't that bandsaw made from cast aluminum? or is it 'white metal' ?
elmo My Oliver? or are you looking at ewlsey's pictures?
ewlsey what is that saw frame made of? looks mighty white!
oh, sorry ;) ewlsey
I wish it was aluminum, it might be worth something...
Blasted C.I. takes on a pretty white look.
the frame is cast iron, my camera is about as old as that saw, so pics are pretty bad
Or hot tanked C.I. for that matter,
Seems like you have a taker....at that price, I'm not suprised!
if it was Al I was going to suggest melting it into something that you can machine :)
yeah, the guy in in GA though, so he will have to "invest" in some fuel to come get it
what is the going rate down there?
we are getting dinged with $1.00 / L
elmo401: are you in Canadea?
who else measures gasoline in L and $ ? ;)
I paid $2.87 for a US gallon in MI yesterday
brits are £
any of the colonies except us yanks
and our money is on par with yours!
well, even MORE then http://finance.yahoo.com/q?s=CADUSD=X
I hear Canadian gas has fewer BTU's per liter ;-)) kidding
I don't mind the gas prices in Canada, but you need to raise your speed limits. 100 km/hr is too slow for a country so large
calcite: I wouldn't doubt it
my truck gets 15 MPG
Is consumption calculated in liters per 100km in CA.?
2005 Sierra Z71 with 5.3L V-8
yes, sorta :P
or would that b .CA
ewlsey: I concur ! 100 kph is DAMN slow... but the current police chief made a law a few years back, going >50 the limit and you get your licence suspended for 7 days AND your car impounded for 7 days. No Questions! right there, on the side of the road!
weights are where I get confused. When a canadian tells me a tool is 5 tons, I never know if that is US tons (2000 lbs.), metric Tons (1000 kg), or long tons (2200 lbs.?)
that is metric
tons is imperial
not in the US
1000 kilograms = 1 tonne
is that bricks or feathers?
if you would have said feathers or gold, I would have said feathers.
the UK is great, imperial gallons, and metric miles (1600 m)
elmo do you need that Carve Write software?
gold is measured differently
I like to do my measuring in drams. after a few, nothing matters!
calcite: I do not need that software, no. just making a statement. just to do letters they tax me for $100? weak.
I have read that centerline cut letters can be a hassle
I guess it is just a compact engraver?
I can't really tell
they do have a quick-change tool holder, though.
elmo401: carve write must be learning from Haas, thier machines are cheap until you put on enough options to make them function
sort of like a German car...
but Haas is a weak machine.
worse! The machine needs "memory cards" Run away!!!!
I'll give you th machine if you purchase all this crap from me.....
their electronics are shared with all models, which is a good idea and simple to change, but you have to repair them often
they also have "demo" options, like rigid tapping, you get so many hours, then it turns off
you pay them and they flip the switch back on
ewlsey: Haas is also like that.
what a racket
the machine must have a dedicatd phone line?
if you are leasing or financing the machine they give you 200hrs of 'on time' before you have to punch in another code.
that's called "after the sale service" bend over;-)
at least our Mazaks are not like that!
made in 'merica thought
americans all think like that!
money now before you can do anything. capitalistic society has already crumbled, why not learn a better way? Such as Customer Satisfaction with freedom of use?
'demo options' is retarded. of course I want rigid tapping. who the hell doesn't?
And take a chance on the open market? NO WAY!
especially if it's already there
this is why once I win the lotto, I will purchase one of these : http://www.gildemeister.com/home,us
never buy american. their bikes suck. my truck sucks. the milling machines suck. even the beer is horrible!
lottery is a tax on the math challenged portion of society
calcite: my thought exactly
Sam Adms is GOOD beer!
that truck is probably made in CA
canada, not california
I'm drinking a Leinenkugels beer, delicious
Are you saying that our northern nieghbors will work for less than our Golden Gated Community brothers
we are taxed more, that is for sure
and everything costs more up here
how much for a gallon of milk? $5 in Ontario. $7 in the East
Builds an appreciation for vlue does it not!
Even the cows have socialized?????
Gasoline is more $$$ than milk
no, the milk is massively controlled.
cows are pretty massive
here, gasoline is (only) $3.78/gal
milk is $5
[01:56:26] <elmo401> http://www.youtube.com/watch?v=_WE-UQX050Y
I remember gas prices being higher in WI, because the roads took such a beating in the harsh winter, and they had to pay to maintain them. No one really complained because it made sense
If you don't pay for that maintenance you get roads like michigane
don't know if it is just the program... but Haas is DAMN SLOW! http://www.youtube.com/watch?v=C4nzeogcZSE
check out this guy: http://www.youtube.com/watch?v=qgougZaY8Yw
.8 second tool changes
is time really money? Some <times> I wonder.
haas makes their money on flashy tricks, not milling time
.8 second chip to chip is great if you have an actual 20 horsepower spindle
i'd take 10, 20 seconds chip to chip for an actual 20 hp spindle vs. .8 and tiny spindle and drive motors, with low accuracy
calcite: time IS money!
toastydeath: it has 20 Haaspower!
FORTY THOUSAND HAASPOWER
we've gone plaid
Can a 6mm end mill take 20 HP?
tool changing means not making chips... making chips means making money
calcite, it can at 52k rpm
you only get 12K on the Haas
If you are doing nothing but teeny tiny endmills on things that don't have very high accuracy requirements, haas is good
i have to grant that.
i think that's why their minimill is such a grand idea
Is 6mm tiny tiny?
yeah, compared to what I've used and what I see a lot of other machinists using
even on tiny jobs, roughing with a 1" or a 1-1/4"
courses for horses true that
You would think that new C.I. was expensive the way the new machines are so frugal with it
calcite: try running this little guy : http://www.youtube.com/watch?v=2rTsBK_E5kI&feature=PlayList&p=2B88DA2E78706F71&playnext_from=PL&index=61
28mm inserts, 18mm depth of cut
to be fair i've only used one machine that could have used that in any capacity
looks to be at least 400mm diameter
A true watchmaker's delight!
delicate it ain't
I try to limit my work to articles that will fit comfortably in my hand
there are many
calcite: what kind of hardware (machine) do you have?
All hand machines,
BTW the job application process has bean totally neutered by computers. what a PITA
Horiz, vert mill NMTB30
have to admit, using a Haas was simple.
Wade bench lathe
16inch Mazak lathe
I really did like their layout.
what do you mean ewlsey?
elmo401 the Haas GUI is pretty good, I like the softkeys of other controls better, but the Haas is faster when you learn it
ewlsey: 28mm inserts ROCK!
need 30Hp to do that, Minimum
and a shovel
calcite: seems like companies have all gone to online applications, so they can weed you out automatically. It is a PITA because you basically have to retype your entire resume in their online "application".
yes, I am familiar with that format what a pain
elmo401: 30hp is not gonna cut it. I think that machine is about 200hp
it may be, but I don't think you need that much...
whats the formula...? X Hp /cui/min
I don't know first hand, I have not been around anything that big
calcite, the equation gets a lot bigger for machine calculation at that size
because power requirement is calculated at a .010" per tooth load and a bunch of other assumptions
bigger font size?
no, longer and more terms in the equation
now this is cutting! http://www.youtube.com/watch?v=NP4sDX87JE8&feature=related
I think we will find that the largest chip thickness that the setup can bear yields the best HP utilization. Cut once!
calcite: I like how you sneak those in...
elmo401, i've never used a machine with hsk tooling
those datron machines are cool
loud is good!
means you are making chips.
chips = money ;)
I wonder what the spindle rpm is on that machine
but elmo You said time was money, now its chips....Oh I'm so confused
says 3kW spindle... whatever that is in English :P
calcite: yes... the less time to make more chips = greater amounts of money
Money is the OPPOSITE of goods, The OPPOSITE of wealth perhaps even anti Wealth
boats are anti-wealth
I think the investment will be...um...high on that machine, it better make chips
That last Vid clip was pretty neat, Wonder what you do with the outcome?
I think we (worlds people) might be nearing the end of our "era of consumption" Many people have so much stuff that it is a burden to them (not all)
very interesting. these 'dental machines' http://www.youtube.com/watch?v=PQgH1q8CBcg
gives me a cold shiver
anything dental, they must all be sadists
Dentist in the pacific Northwest (used to) have the highest suicide rates of any professional
calcite: I wonder why that is? They make a lot, and it seems low stress
Looking in other peoples troubled mouths.....
It would depress me!
That's why the "pictures" (x-ray) are so popular....one step removed...
yeah I bet they seem some bad ones...
How do you imagine the g-code is generated from dental impressions?
3D scanner, creates a solid model, CAM software from there
probing would take forever
What's the entry ticket for a 3D scanner?
3D laser scanning is impressive technology, and it gets better all the time
$15K from Roland
calcite: there is a small bench top model you can get for about $3k, let me find the link
not super accurate, but still impressive
I was looking at this http://www.solutionix.com/product/3d-scanner.html
.03 mm resolution. hmmmm
hell a good probe can cost twice what the scanner does
yeah, you get what you pay for
at work, we are now having suppliers install laser scanning systems rather than using CMM machines are inspection fixtures, it's pretty slick
The world of non contact information gathering
The nice thing for us is that we can understand how the part looks when it comes off the tool, before we would pin it down to a fixture to measure it, but that sort of defeats the purpose if we are trying understand part twist in the tool...
What a relm of possibilitiy
government job applications could not be more time consuming
How do you mean? documentation?
you have to take several blood oathes that you are legally allowed to work in the US, not a felon, not a minority...
Oh right the App process.
check out this tool change: http://www.youtube.com/watch?v=4XYakTeQahA
I've seen tht one...the door opens faster than most changes
[03:30:38] <calcite> http://www.youtube.com/watch?v=yj_PsRyRGM0&feature=related
in perspective ;-)
that one changes tools by date
how can you tell the vid is "real time"?
the audio sounds real time
the robodrills are quick too: http://www.youtube.com/watch?v=CTUFbSzhHDM&feature=related
that looks like it should keep up with the payments
light duty milling though....horses for courses
calcite: I have seen that hossmachine thing around, I have no idea why he would do all that work to that cheesy little machine
I wouldn't do that to my bridgeport
I don't think it's going to pay off
joe vicars toolchanger was pretty cool though
What are you referencing?
for the sherline
do you have a link?
calcite: the slow toolchange video you linked
Oh I just threw that up, not even reading the credits
I HATE pretend machine tools
but respect other standards for acceptable results
some of mine are sort of pretend, but I only need pretend performance
[03:42:53] <Eric_K> http://home.insightbb.com/~joevicar3/Automatic_Tool_Changer_Plans.htm
Eric_K: that is pretty sweet
If the results are compromised by machine cpabilities, It's time to stop pretending that everything is OK, It depends on what the product is. Sometimes it's not the workpiece.
he was the guy that talked me into getting a BP series II
I have been tempted to try building a changer for my Dyna Myte, I'm not sure how to handle orienting the spindle though...
seems a lot easier to buy a machine that already has an ATC
What part of the SII don't you like?
heh, a 3.5 minute video showing two tool changes...
seems like the the quill travel would be a PITA on a knee mill
Sometimes the NMTB30 tooling and th air powered butterfly impact gun make a lot of sense
ewlsey: usually it's ok, but sometimes if you have long and short tools, it's a bit of a pain
you just have to be smart about it
the "loud handle" ;-)
can you lower/raise the knee or does that screw everything up?
the knee always (?) has a graduated scale so you can move it a certain amount
By the numbers is how I learnt ;-)
as long as you changed the work offsets I guess it would work
usually even inches
+/- 001 depending
I've set up "short tools" and "long tools" where you have to move the knee in the middle of the job
should be fine for one offs, might get interesting for production
for production you'd get better tools (closer to matching lengths)
screw machine drills are helpful
It's like the old "programable move to zero" DRO's"
in the job I'm thinking of, my boring head was the problem - very long
calcite: ever use a machine with optical scales?
with the built in "illuminator and magnification lens"?
cradek: time for a jig bore
calcite: that's the one
Or just Accurite?
no the magnifier kind
my dad has one in his shop, an old index mill. quite a system
a Vernier built into the machine
I wonder how they engraved those scales
ruled those scales
with a rulingmachine
insert spaces where needed ;-)
heh, it does what it needs to, but it not very convenient
any CNC mill with a spindle encoder would do fine as a rough ruling engine.
can be done readily on a lathe too
yeah but those were probably made in the '50s
the scales that is
Old is so.........old
I'm working on a spindle speed and position sensor for the 16inch lathe now
cradek: is it possible to set up toal load monitoring in EMC2? In theory the control would just need an input for spindle load...
it's not really needed, just curious
0-10V = 0-100% load amps
what do you want to do with it?
Amp meters used to be part of most "good" machine tools
set up an alarm if the tool load range is exceeded maybe
I use the VFD function from time to time
or have the control reduce the feed
reducing the feed rate might not be the best choice.
A cut is a cut
the idea is that when spindle load goes up the tool is getting dul, so slow down the feed to conpensate
Although the material deformation "work"is a significant load
perhaps a color camera... "turn 'em blue, then back a few" ;-)
Is there any place in halui or axis that has the cycle time? so it can be displayed? in pyvcp?
Oh Oh The fangs and hair are growing....nite Owl!
terrylm: what are you hoping to use the cycle time for? or is it just for piece of mind?
Just to get an idea how long it takes to run a part, with out having to look at a clock.
alex_joni: What did you use for speakers/amp on your iNet radio?
www.youtube.com/watch?v=7h_Q3GmwShQ&feature=related now thats cool
Jymmm: reular pc speakers
Just had a quick question for yall.. Sorry I am a little new at this. In the newer version of Ubuntu my Atheros Gigabit Ethernet (Wired) is recognized and works out of the box. With the older version of Ubuntu that is included on the Live CD the network card isn't even recognized. How would I get the drivers for that card with no net access on the Linux side of my dual boot setup, and or how I would I make that work without upgrading?
MarkusBec_away is now known as MarkusBec
ries_ is now known as ries
Paul1 2 options, see if ubuntu 8.04.2 supports your NIC out of the box
then install EMC onto a clean install of that
or wait a few weeks and see how EMC on ubuntu 10.04 is going, its sounding promising
Valen: 8.04.2 wouldn't help
installing emc2 will pull the emc2 kernel, which won't have the working driver
except that you will have more than one kernel, and booting the latest non-rtai kernel will make eth work (but emc2 won't work)
once he has a working system in the right era he could compile it all though perhaps?
kernel + emc
not an "optimal" solution though I agree
probably easier to use 10.04 ;->
hows that going btw?
MattyMatt is now known as MrMatthew
MrMatthew is now known as MattyMatt
I am looking for a suitable controller for my spindle motor. something that can deliver between 24 and 40 volts @ max 1-1.2 amps. any suggestions?
for the spindle? or the Z-axis?
borud: is it a super tiny spindle? that's hardly anything.
watch size lathe?
herron_ is now known as herron
SWPadnos_ is now known as SWPadnos
Good morning everyone. I'm looking at building a small router with EMC. Is it possible to set things up with 2 Z axis? If so, what would the 2nd axis be called?
do you want to use both Z at the same time?
I would use them at different times.
One way would be to have two profiles, one for each Z axis.
Maybe I wasn't clear - I'd use them separately but in the same program. Since I'd only ever use 2 tools, I'm hoping to eliminate a tool change.
so, one at a time? that is simple enough. no need to even call it z'
just have a different workplace offset and call a different tool offset, then continue cutting
are they separate motors? do you want them to be turned on/off with EMC?
I take it one tool is more like a flat endmill (to hog out material) and the other has a taper or ballnose?
Hi elmo401 - yes they would be separate motors and turned on and off with EMC2
Yes to the tool bits.
if the motor mounts never change then having two workplace offsets (g54 and g55) would be the simplest way to do it.
along with calling a different tool length when you change from g54 to g55.
as for on/off, there are options for that. not too sure about spindle0 and spindle1. if there isn't then you could use spindle0 and coolant0, or something similar.
m8/m9 to turn on/off the second spindle.
m3/m5 would be for the first spindle ;)
Brilliant! Thanks :)
[15:49:39] <elmo401> http://www.linuxcnc.org/handbook/gcode/g-code.html
for more info on g/am-codes
damn spell check... m-codes
second Z axis would probably be W
if using emc 2.4, you can use tool offsets in all of XYZ so you don't have to switch work coordinate systems - just switch tools
cradek: how do you make the tool 'center' different on a mill? all I know of is length (Hxx) and diameter (Dxx)
with the new tool table format in 2.4, you can put any axis words you want. You can have a tool with X Y Z offsets and another with X Y W offsets
if T1 was in the primary spindle you might have T1 Z1.234. T2 in the secondary spindle: T2 W2.345 X4 (if secondary spindle is 4" in X from primary)
cool, that allows edm tools to be cut off center of holding fixture. and if cut 'straight' yet used at angle, thats just wrapping a G0Cblah around it
very nice feature.
now, about turning the second spindle on, what m-code would he use?
Dropout_ is now known as Dropout
MarkusBec is now known as MarkusBec_away
Dropout_ is now known as Dropout
Hi non activity here
where can i find in the docu how i can put my own start ngc into the ini
For displaying cycle time, is there any ready place to pick it up? halui? axis? other?
anyone know of a nice place that ships international that has long end mills?
6-10mm diameter and 120-130mm long
wow, that is long and skinny!
you can get theas at your local dealer
you shoud think about a longer mount
copy ball mills are given in a length to 200mm
what good is a longer mount if it adds more dimesion that cant be used?
shrink mount at 2Degree
If I need to reach in 90mm, then a longer mount wont help me much =)
what are you cutting? plastic?
then you need 5Axis
so you can mill in degree with the part :D
frallzor: MSC would have them probably, and they probably ship anywhere I would think.
Manhaton Supply Company, Manhattan NY.
Where are you?
there is a swedish tool manufacturer... name eludes me at the moment.
need a few end mills and ball end mills
[17:36:45] <sealive> http://www.hoffmann-group.com/webcontent.omeco/document_3193.html
they are pricey =)
long tools can be
if you are thinking about Dormer
Also you might look for a local tool sharpener / maker?
also till 215mm milling lenth
same stuff =)
Holex has also som of these 50% less
kopier isnt really what im looking for
mscdirect.com for MSC.
lets see what they got then
You need it, they got it. They don't have it, it don't exist... maybe :)
frallzor: where do you neet the tools NY CA
ther is a big factory at niagrafalls
what good is that when im sweden? =)
MSC didnt have it, but I know they can be found =)
Look for small tool makers near you. I know we have a couple of them here.
pretty sure there arent any here
One of them uses a CNC mill grinder from sweden.
[17:50:29] <sealive> http://www.secotools.com/wps/portal/se/!ut/p/c1/04_SB8K8xLLM9MSSzPy8xBz9CP0os3hnVwNXExdTEwN3PyMzA08L7zBDr1BPYxcLY_1wkA5kFQF-BgZGTgGOwc6hLp6eFmYQeQMcwNFA388jPzdVvyA7O83RUVERAFcC190!/dl2/d1/L0lDU1EvUU5RSy9ZQlp3L3N2/
direkt from sweden
sweden is large where are you next big city
it is near the new mega brigh right
there is a stor at the campus of the university
frallzor: If the local college has a machining program, they usually sell tooling/maerials fr students.
pretty sure they dont do that here
just materials and such
only one way to find out
well I know what machines there are =)
and none can handle these sizes :P
then ask the instructors
they may have an idea
thats an idea
MarkusBec_away is now known as MarkusBec
it is best at thease long tools to stabeliz with high cooling pressure
my 250mm drill goes best at 15bar coolingpressure in ALU
frallzor: there is a Car factory from Mercedes in malmöe
i need to go Bye
Dropout_ is now known as Dropout
linear move would exceed joint 2. does that mean y axis?
stepperconf wanted a negative range and I gave it a positive one
no, just us sleepers
Hi,I am new to this forum and am in the process of trying to bring up a D510 motherboard with ubuntu 9.10. Anyone have experience with this MB?
what's the problem?
Bob__11brookway: D510 form HP ?
Right now I have it up and running, but I will be trying to put EMC on this following the advice on Dave Coles page.
He said I should join this forum, so here I am. THe d510 is an Intel ATOM processor motherboard.
Thanks for responding, I have to go now, but I have managed to get connected here which was the immediate goal.
a piece of mdf, a 10mm tool, 10mm acrylic and you got a nice jigg for doublesided milling
god I need a 4th axis =)
then a 5th :)
Aye, I wouldn't have thought that only one extra axis was much help on a Mechmate
4 axis in totalt is muuuuch help =)
planning to shorten its workarea by 400mm
and add a 4th axis in that area
perfekt for modelmaking
4 was ok for me till I NEEDED 5!!
but at least this jig I made will help me milling 2 sides =)
6 DOF would be better :-)
If my servo motor stops with no torque and +30V on each phase, but with a perfectly valid Hall signal, It's a problem with the drive, I assume?
Dropout_ is now known as Dropout
I hate projects in school, im flooded with ppl asking me to make models :P
Tell them the hourly machine rate.
what can one take? :P
I can't say I know, but somebody must.
say you have a piece of 100x100mm
and 2 tools, 2mm and 10mm, where is home then in mm?
is it at the edge?
corner edges that is
so if you go along X when its 0, then 5mm of the 10mm tool should be outside the piece right?
Normally, but you can choose differently if you like.
I guess its like that if I need to turn pieces around
center the workarea and know where 0,0,0 is =)
I wonder where I can find the 7i43.board file?
MarkusBec is now known as MarkusBec_away
MarkusBec_away is now known as MarkusBec
MarkusBec is now known as MarkusBec_away
What are you looking for Andy?
pfred1: ha ha ....
Ok .... now I have to sing along with it .... thanks a lot pfred1 ;-)
I'm just happy I got this motor driver done I think I still have to ring it all out
man I hate making these!
What are you making?
now all I have to do is make 3 of the much easier ones
a CNC machine
but one driver I designed is a real PIA to build
shame on you! ;-)
which driver did you go with pfred?
well i used an old chip that i should have never gotten involved with live and learn right?
tlab one i just finished up is based on an SLA7026M without an internal step sequencer
but from here on in I'm using TB6560AHQs
which are dead simple to implement
I should take a picture of this one I just finished up it is a work of art if I do say so myself
the TB6560 does 40V?
I seriously doubt it
people seem to experience troubles if they don't allow for back EMF headroom with them
on spin down steppers generate hella back EMF which overvolts
I'm running mine at 12VDC and I'm happy with the performance I'm getting
24 make that
you may push them a bit more but you can't max them
even at 24 I'm getting lots of speed with good torque
tlab the fast decay mode really makes a huge difference
you effectively almost double your running voltage it performance wise
hmm I used mixed mode on my a3979
I just go all out 100%
it has 0% 25% 50% and 100%
the a3979 is surface mount isn't it?
good to what like 1.5 amps?
yes, and 2.5A
crazy heat via layout too iirc
ya I have 2 gnd planes
yeah its not really what I'd call every hobbiest friendly to work with
no it's not.. I didn't even try and breadboard it
I went thru 2 board revisions to get it right
the AHQ is in a through hole ZIP package can slap a heatsink right on it
they're dirt cheap too $4.73 out of Digikey
what is the max microstep on it?
you can barely buy two plain old transistors for that kind of coun
which is past what my machine can really put out a pulse stream for
yeah i run in 2W1-2 its fine
so 8 steps... I run a 1/2 step and mine seems fine
it does full and plain half too
but the 2W1-2 is nice
the a3979 says + and - 2.5A
I'd say the biggest drawback with the TB6560 is getting the current sensing resistors it needs
Allegro did that a bit better
I was going to use lmd18245 but at the time I need 2 per stepper and they were 14 bucks a piece, they are now 20 bucks a piece
yeah they're insane cash
next driver I build will be discrete for a really big motor
only thing nice about them is the 55V
but thats way down the road for me after this machine is finished
I thought about building a linistepper
or I may just belly up the cash for a gecko then I donno
7 amps at 80V is tough to argue with
yea that'd be nice
at this stage of the game I'm pretty much all motor driven out
wonder how they do that
mariss knows his stuff
he uses individual fets in his H bridge
some of his drives even change sequence on the fly depending on step input
80V 7A would be a big stepper lol
I've noticed that at extremely slow step rates microstepping drivers move sort of funny
more like erratic
too high of a step speed?
telmnstr no at a very slow input clock
hmmm is it like the motor isn't actually completing the step, or missing them? Like its travelling back to where it was?
yeah the shaft sort of bobbles around it doesn't smoothly turn
not like a single stepping sequence would
Im new to EMC but have played with steppers before
well singles inherently jump to poles
some drivers seem to have the ability to change the microstep level
or I wonder if there is too much resistance for the motor
telmnstr only very high level drivers do that nothing you buy in a chip does
it'd take external microcontrol to pull off magic like that
well like the chips Im looking to hack say it does like full step quarter step and something else
which is why I'm about to cry
sure when you change input modes
but you need external brains to make that switch no chip I've ever seen does it for you
That's part of the reason I'm here :-)
and I've seen just about everyone being made now too
my steppers just sitting sound funny, sometimes they will squeal
tlab inductive sense resistors do that
they tone with the PWM chopper
Got a laser engraver that was built off of a roland plotter, looking to ditch the control electronics and go with something homebrew, or hack the roland circuit board
change to noninductive sense resistors and it should quiet up
the more I look at it, I'm thinking an atmel (think arduino) board that does all the stepper driving and stuff
telmnstr if all yo uwant is cheap and easy stepper drivers look at the TB6560
I was looking at the arduino emc2 module (a little) but it's mostly using it for IO, but it seems like the stepper logic could all be done there, and then directly drive the driver chips I have a stack of (L6203)
telmnstr if it has enough power for your applicaiton that is
this application, it's like, the motors require nothing. It just moves a mirror
but then EMC has to control a PWM to fire a laser also, which I understand has been done
I also have a 4 axis chinese made stepper driver off of eBay which I plan to use to build a mill
this is all at a "hacker space" in Norfolk VA
looking at lead screws and linear slides and stuff on ebay
telmnstr the chinese board is likely TB6560 based
yea let me grab it
telmnstr or TA8450 if you're unlucky
pfred1, this is the sense resistor I used http://goo.gl/wwwr
is the pinout the same on the TB6560 ?
telmnstr yeah there's a lot of reasons Toshiba canned the TA
telmnstr I've been wondering if they're not pin compatibile lately
tlab those look noninductive
the laser engraver, the Roland board uses 4 x PBL3717As
and those directly drive the steppers
basically floppy drive (5.25") sized motors
tlab have you tried changing the PWM clock caps at all?
telmnstr yeah anything drives stuff that small
can EMC directly step the motor?
versus sending step + direction?
telmnstr you need so many outputs
I read that as "PWM caps lock"
telmnstr 4 per motor
right, would need two LPT's
8 bits for 2 motors + 1 bit for PWM of laser
telmnstr and really I'm having some issues on a 1 GHz machine just making step signals
then the hall effect sensors that it has for reading
telmnstr you can well imagine what that'd be like multiplying it by 12
that's where using usb + microcontroller offload would be handy
multiplying what by 12?
tlab osc caps or is it internal?
tlab lots of later chips inboarded them
tlab lots of stepper ICs you have ot connect an external cap to make the PWM freq