* alex_joni needs some beauty sleep
alex needs a *LOT* of beauty sleep!
Jymmm: how the steppers are going ?
idle at the moment
think it's a thermal issue.
hell and damnation
there's got to be some way to convert .svg files to .hpl
rayh is now known as rayh-away
heh jymmm it was your post on cnczone that led me to freesteel
how did you hear about it?
whoops nevermind, it was someone else that mentioned it
g nite all
Jacky^ is now known as Jacky^afk
god the people on cnczone are so ignorant
"You can't change software. It is what it is. You're saying you want to "change" Mach2 or TurboCNC to output to the usb port?"
djb_rh_ is now known as djb_rh
fenn what is 'freesteel'?
fenn: I cna convert SVG to HPGL
fenn: Hell, I can convert SVG to whatever for that matter =)
03paul_c * 10emc2-auto/wiki/ (21 files in 16 dirs): "Auto update wiki from a cron job. Mon Oct 24 05:30:01 BST 2005 "
alex_joni hi and bye!
go to sleep :P
Jacky^afk is now known as Jacky^
alex_joni: are you familiar with html ?
i want to pass a term to this website from a python module http://www.demauroparavia.it/cerca
Jacky^: a bit
bu tnot with python
[13:12:36] <anonimasu> http://www.sigmatek.at/english/e-produkte/e-pdias.html
sigmatek sounds familiar
the ones with your PLC?
wanted to bug you.. but didn't catch you :D
finally I did it myself :D
hi, just here for a second
too early on a monday
fixed that stupid tkemc bug (jogging multiple axes)
can you jog in multiple axes simultaneously now?
up to 4, as there are no more key-bindings :)
if there were it would probably work with even more
can you try smthg on axis?
that bug has offended me since day one, but I did axis instead of fixing it
not now ofcourse
sure, later, what?
I wonder how it works:
define a machine with XZA instead of XYZ
and let me know :)
it won't work right
* alex_joni wonders about jogging, position, etc
well, it won't *display* right
the axes are hardcoded xyzabc
alex_joni: product news ;)
I hear some talented guy named alex can fix things like that
gotta run, bbl
[13:20:04] <Jacky^> http://www.demauroparavia.it/cerca?stringa=blahblah
seems to work
geckodrives received right now
Jacky^: don't break them :D
E. 103 more..
shopping $ 67
you'll tell us when you're sober
you drank :D
E. 420 + 103 for 3 geckos :/
* Jacky^ take a bottle of wineeee
* Jacky^ want forget..
wine is too soft for you :D
let e try ballantines
E. 103 .. are a lot
comes in january ;)
i was expected a big box ..
these are 8x8 cm
are these the drivers ? O_o
Jacky^: yes :D
1.5 kW .. imagine that :D
it fit on a hand
I mounted it on a P4 cooler (copper)
and it works great
Jacky^: amazing how small :D
open it up, and you'll know why it's worth the money :))
all smd components i suppose..
lots of them
Jacky^: as I said, you cant build better drives then them..
anonimasu: I hope .. :/
Jacky^: pick them apart ;)
* anonimasu will be ordering a new collet holder soon
about 500eur for taper & holder..
* alex_joni has no clue what that is :D
[13:49:21] <anonimasu> http://www.ss-maskin.com/PDF/i-si.jpg
* anonimasu aywns
looks like plastic
* alex_joni aywns too
what do you guys think of positioning speeds of 700 m/min ?
* alex_joni grins widely
makes me kind of jealos ;)
is that a new robot?
it's for a laser
but that's spot speed
and the laser gets there through mirrors
so it's easy to do 700 m/min..I guess :D
* anonimasu wishes emc could handle that kind of speed
[14:14:53] <alex_joni> http://www.photonics.com/spectra/applications/read.asp?aoaid=345
anonimasu: will in time :)
but I don't want to go anywhere near a machine doing 100m/min :D
if emc will push a machine along at > 100m/min
I'll build a machine that'll do it..
ok.. do we have a deal?
* anonimasu nods
some scales for that machine: http://www.sonysms.co.jp/e/products/magnetopticalscale/
- Accuracy: 3 + 3 ML / 1000p-p
- Offers high-speed response of 150 m/min and supports linear motor control
should be ok :))
this is hilarious:
The resolution of the AB quadrature signals can be switched between 0.05, 0.1, 0.5, and 1um
at 150 m/min
1 um at 150m/min
who can count that?
servo spindle at 40k rpm.. at a lathe..
on 0.05 um and 150 m/min, if my calcs are ok it gives 50.000.000 counts / sec
and constant speed contouring.. ;)
that's a project for emc & hal
place one of these on a lathe: - High resolution: 1 deg/10000 rotary. :))
you can probably buy a house for the price of a scale ;)
so violent stuff
* anonimasu imagines cutting alu at 100m/min
anyone know how much ampere are 500va for 220V-75V transformer ?
6.6 ampere ?
depends if its 75 AC or DC
whats up ?
gonna learn python today
then i'm gonna write a .svg to g-code script
to hack axis ?
figure i should learn it anyway
.svg is a vector graphics format, kinda like eps
bezier curves and such
re-write the planner to machine .svg parts ;)
that's a good idea :)
but that's probably too much work :)
just need to write a 3d .svg editor :P
ayam already handles 3d bezier curves, so it's not totally unfeasable
3d modeler with a somewhat reasonable UI
compared to blender at least
it's not hard to turn bezier curves into sequences of segments.
cradek's ttt does that for true-type fonts. I forget which kind of curve it is.
huh, I thought I contributed an adaptive subdivision algorithm to ttt, but it just uses a hardcoded 10 segments per bezier curve
btw, cradek posted an stl to dxf convertor
so that's not very far from what you want
uh, it's not?
stl != svg
like they say
don't know don't care :D
anyone thinking about drives for the surpluscenter/sanyo denkis ?
etla: nope :)
anyone heard of a CAD file ending in .src ?
rayh-away is now known as rayh
etla: why cant you get rid of the pin for brake
then you'd have 11 pins
when you turn the power supply on, it energizes the brake coils
any problems with that?
cradek: chris, are you around?
how's it going ray? still at the mazak?
Yes. And I feel like an old dog and someone's trying to teach me a new trick.
why is that?
Hal + CL
heh.. not the most intuitive stuff I reckon
Some sort of mental block
supid Q: what is classicladder ?
etla: stupid answer, google it :D
etla: a PLC programming language
[15:49:50] <alex_joni> http://membres.lycos.fr/mavati/classicladder/
rayh is now known as rayh-away
so what kind of chips are you programming ?
chio chips :D
etla: it's a software PLC emulator
PLC= programmable logic controller
etla: a PLC is a device that does some logic stuff
if one input goes high, then it might wait for a while
turn some outputs on, etc
and you usually program that using some graphic language
at least that's the birdview of it :)
and you want to motion control with the plc ?
lots of stuff
how do they compare with microcontrollers and DSPs ?
higher abstraction level
they usually have a microcontroller or PC inside
but you don't need to take that into account
hmmm I think I will stick to PICs ...
you cant really compare them...
plc's are very very neat in induatrial stuff
like toolchangers. as a example
do you know much about the I2C bus/protocol ?
I havent used it but it seems simple
would it be fast enough for axis command / encoder count transfers between a servo amp and a controller
awww crap FreeCAD is written for windows
what do you need to draw ?
freecad is supposed to be a 3d parametric cad based on opencascade
I havent seen any free 3D cads that are any good
that's because they havent been written yet
I like the login in MultiSurf (www.aerohydro.com)
once you have drawn everything
you can just pick up one point and move it and everything moves with it
you start with points
isn't that the same thing as parametric modeling?
curves are defined by points
surfaces are defined by curves
approx: rumor has it that you are designing a driver for the surpluscenter servos ??
how far along are you
I will get on it as soon as I recieve the motors
ok, lots of other guys doing the same thing
i have done some tests with another 900W servo
it already tracks motion by step/dir
ok, I don't think I want to do step/dir control
does it have sinewave commutation ?
yes, it has sinewave
is the sinewave based on encoder counts or interpolation btw hall signals ?
btw, it can do step multiplation so pc won't be overloaded
yes but with step multiplication resolution will suffer
are you coding in asm or c30 ?
not badly if those sanyos have 8000 CPR encoders
now in C but will be optimized with asm
but it will allways be a tradeoff between rapid speed and resolution
OK, would you cate to share some code and/or schematics ?
there is not much to share at this point :b
are you using an ICD2 programmer ?
found anything cheaper ?
I have my own icd for avr
ahem, isp programmer
so it is avr based ?
lerman_ is now known as lerman
does it have hardware encoder counters and pwm generators
PWMs yes, but no encoder interface
but encoder can be read quite fastly with interrupts
what clock speed is it running
approx: use an LS7166 for encoder
etla: I'd suggest one of these for programming http://www.olimex.com/dev/avr-jtag.html
i try to keep part number low :p
avr can run 20MHz
approx: I found it WAY better than any other solution
how that is so good?
does take care of filtering garbage out
easy to access
does take care of index-pulses
google it up
not very cheap... but surely worth the money
approx: if you poll your counter at 20 mhz, ;) what's left for calculating
you can't poll at 20 MHz
you still need about 4-5 instructions per poll
but one can use INT0 to count encoder
if it's properly decoded
no wasted time
only need one?
another channel can be on ordinary i/o
I already tested a 4000crp encoder with dc motor
it coudn't generate high enough frequency to lose counts
approx: how fast did you run it?
how do you know it doesn't lose counts?
well I have monitored the CPU usage.
cpu was over 50% idling at full speed
how do you measure that at a avr?
build a non-realtime loop that counts how fast it runs idle process
gee isn't that 48mhz?
are you using a operating system on the avr?
not wery easy to explain :p
no, just my code
since you seem to be doing multitasking?
no, just interrupts
"non realtime" task is all non-interrupt stuff
so where's the non-realtime loop ?
ahh I start to understand
ok.. try not to mix terms,
so you had code taking care of int's
and code doing nothing (setting a pin high or smthg)
and you emasured that
approx: are you talking about using a single interrupt pin to do interrupt-driven quadrature decoding? I don't quite follow how you would do that.
yes I have leds that will lit if load is over 50%
jepler: need only one signal to get edges. other signal gives direction
jepler: run the quadrature through a J/K
it will give you step and direction
from the quadrature
approx: so at each interrupt you look at the state of the other quadrature output to decide the direction of the movement, then change the interrupt to be triggered by the opposite-going edge?
yes but no need to change interrupt. avr can interrupt on both edges
that's utterly stupid.. I reckon
and you monitorr the Halls also ?
you could run it through a bistable, and get only counts
1 count up, 1 count down
halls are not much needed when using encoder
but you need to get an index signal before you know where you are
what happens if your counts get screwed?
the motor stops running?
approx: which AVR can do that? I'm most familiar with at90s2313 (an older part) and its datasheet gives "low level", "falling edge" and "rising edge" as the only option. Not "both edges".
atmega-series have "both" option
but well, a encoder chip might spare you lots of pain..
but isn't that serial communicated?
that's just a few polls compared to hogging the cpu with interupts..
how much those LS7166s cost? are they available?
$11.65 / 1
$9.35 / 25
$7.45 / 100
$6.35 / 500
$5.40 / 1K
[17:19:06] <alex_joni> http://www.usdigital.com/products/ls7166/
it is cheaper to put a dedicated atmega on counting :)
what do you pay for a atmega?
cheaper yes, better.. no
any model with 8k flash is enough
currently i have atmega8
I pay about $12 for atmega168's..
128 I hope
ah well you wont do the job of that chip as good with a micro..
let him try
if he succeeds he'll prove us wrong
wonder why it is so expensive...
fenn: suggest looking at the pdf
how about really simple PLDs for encoder counting?
would be fast
approx: what kind of drive are you designing?
have you had a look at the datasheet
approx: how bout a flipflop and a binary up/dn counter
fenn: I did that on a project...
it's a lot more complicated :D
too much analog components
I could get only 4-bit counters
approx: what analog components?
i have seen some schematics of such circuit..
it has delays made with capacitors etc
some circuit at cnczone forums :p
i doubt it matters if you miss a count every once in a while at 8000 ppr with index
no pulses should be lost
eventually motor will lose torque and stall when commutation phase drifts enough
but you have index to reset on and compare count values to
then it might be ok
if you are off enough that the motor is out of sync then you have a problem, agreed
but 1/8000th of a revolution = .000024" with 5mm ballscrews
but if one does lots of repetive short moves then index pulse will not be encountered :p
use the halls ?
you get the count reset at least six time per rev or is it more ?
4 pole motor so is it 4*6 times ??
but halls are inaccurate
aren't those just analog magnetic switches?
should be ttl outputs ?
it's a semiconductor
depends on motor I guess
yes but the trip point may wary too much
hmmm need to test that somehow...
compare it to the encoder output when you get the motors
it should trip on the same number each time
i'm not counting on that. i have zero counting error tolerance on my controller :)
i will not be satisfied with nothing less
yes, hook signals up to daq board and somehow spin the motor... then analyze waveforms for hours and hours :)
well you gotta do it some time
the counting error for the sine drive can be reset every index or hall pulse
and testing should be done with higher rpm than actual usage
but if your closing the position loop also with your drive then counting errors are a problem
are you planning on using the irams10 for the power stage ?
no decisions for that yet
maybe discrete mosfets
cheper to fix if it blows :)
does anyone know how torque command would be done with these motors ?
what do you mean?
yes, is that the normal way to command servos
pc sends out torque commands and receives encoder count
its pretty flexible with hal
ok so what is the 'best' way ?
i think most servo drive cards send out torque or velocity
it depends where you want the PID loop to be
I think I want it in the pc
more flexibility that way
if you send velocity commands you can't control torque damping from the pc
hmm.. and torque corresponds to current in the motor ?
so the drive needs to monitor the current and control it
the drive puts out xxx amps and makes sure the controller hasn't gone crazy
i mean current limiting is still in the drive
but basically its just a big amp
so need to monitor current at max of each of the sine-phases and adjust pwm according to that
* fenn kick-starts his brain
don't you calculate pwm based on the commands you get from the controller?
but the pwm controls the voltage.... not the current
how do you limit current when the motor is reversing?
what do you mean by reversing ?
you switch to the commutation scheme for reverse
and then you start applying the commanded current
that's the part i dont understand
it all boils down to the fact that i dont understand v=ir
er, v=iz i guess
how do you monitor current? (my ignorance is showing)
there is a sense resistor on the negative bus
you take that voltage and ad convert it in the microcontroller
i keep forgetting microcontrollers have all sorts of nifty doohickies on them
but I think it needs filtering cause it is pcm...
and it would be nice to have that also isolated
I'd like to use the EPP interface for communicating with a pc
like the pico system does
good evening folks
well, what emc2 version should i take ?
hi, just learning to use eagle....
no idea about emc2.
for the next llivecd ?
um, the latest?
I'm using emc1 for various hobby projects, haven't touched emc2
etla: cool, eagle is nice. im going to lern it too, somedays, when i have time. i want to do pcb milling :)
cncuser: does puppy-emc have a web browser?
fenn: ok, so cvs
fenn: it could.
dillo is only 357k compressed
fenn: you can install a dotpup package : dillo, mozilla
maybe i put it in
you should put in dillo-i18n-misc
cncuser: we have Pads at work so it's all familiar but internet collaborations etc. requires the free eagle...
fenn: ok, ill do :)
mah, thos sf cvs is lame
alex has a daily .tgz on the web somewhere
i doubt it has changed much
*waiting till 3 minutes for CVS login*
ha, its done
:) gets me everytime
cncuser: We compiled emc2 yesterday and are using it here.
some additional module stuff there.
rayh-away: i c, it updated much :)
clean compile :)
There were some additions to config and a couple hal modules.
hmm, whats the --prefix for if tehres no install target
someone want to help me separete only the necessary files for emc from the sourcetree ?
do i only need scripts, configs lib and bin ?
you also need rtlib and either tcl or axis
fenn: i know, axis will not be in it right now. having trouble getting python smaller
whatever happened with crapahalic?
surpluscenter seems to have declined my purchase..
"go away, you are too much of a bother"
* anonimasu sighs
no clue why it happened..
I should have more then enough cash on the card..
maybe i will send you mine, then I wont have to think about motor driver design
I wonder how much a logosol driver cost
Yeah, you know how those romainian's are.
bah 91v DC max
and those Sweeeds too
anonimasu didn't someone offer to get them for you ?
fenn dont you live aroudn the corner from them?
[18:53:56] <anonimasu> http://cgi.ebay.com/SVG-Track-Systems-Logosol-Controller-4-Axis-99-57301-01_W0QQitemZ7556392565QQcategoryZ97184QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
fenn were you asking about a way fto convert SVG to HPGL ?
fenn I can do that easily.
i want to do it
I'll take care of it tomorrow night
fenn : Fine, get yourself Corel then.
i'm going to write a svg to g-code script
already been done.
yeah but it sucks
what's the point of using .svg if you cant do smooth curves?
See, your blaming the code when you didn't bother to look at the source application tha generated the SVG's.
hmm got emc2 down to 6220 kb
cncuser: what are you doing?
anonimasu: i shrink
SodiPie and InkSpace have FP issues
cncuser: I hope you arent commiting what you shrink ;)
have had for years.
what do you mean FP issues?
Decimal, floating point.
anonimasu: youll see the iso on wednesday. im heading for <20mb
you mean like rounding errors?
anonimasu: puppy sit! (aka cooltoolix)
fenn you'll have to look at the bug list, I just know it's not accurate enough to be able to say 5.000 is actually 5.000 instead of 4.975682227
i wonder i upx has impact on emc2
I think you should shrink something else then emc
anonimasu: i shrink everything
anonimasu: no excuses
anonimaus: rtai also a big peace
anonimaus, i like that
like mighty maus, but not
we are chasing weight at work ;)
for high-performance forestry equipment?
I am involved in racing right now ;)..
what the equivalent power of 250W in NM for DC motor ?
you have to specify what rpm
1.500, 2.000, 3.000, 4.000 min-1
i'm looking here: http://www.bonfiglioli.com/bcspres_it.html
better here: http://www.bonfiglioli.com/bcspres_uk.html
now, i know i want 250w dc motor ..
i just see type and torque in NM
well, torque changes with what rpm you are at
still you can calculate it to get an estimate
ok, i'm a bit confused ..
i will ask to les when hes around
units is throwing a fit at me
units 250W N*m/min
what are 15000 ?
so 3.75 Nm at 4000 rpm
assuming 100% efficiency
which you don't get
right, that's only an estimate
so, i think bcs70 model , 4,5 Nm shoud be enough
instead the bc60 has 3,0 Nm and could be few..
that is continuous torque rating, peak rating is higher (i dont know if you need 250W continuous or peak)
assuming 250w as reference
peak torque rating is usually the one that counts for CNC applications
uhm.. les sayd 250W so, i think he meant peak ..
you should probably ask him
btw i will request quotes for these 2 models
maybe you should request a free sample :)
whats a free sample ??
free servomotor ? :P
somehow I doubt it
very hard to get it
speed 1.500, 2.000, 3.000, 4.000 min-1
supply 24/ 180 Vdc
voltage gives rpm..
amperage privides torque :)
this mean it can run 1t 4k rpm with 180 V
too high voltage..
that's the kind of voltages you need to have..
gkevo run at 80 right ?
80v 8a I think..
this mean i will never run the motor at max speed ..
it's still probably a good motor
look the the torque curve
torque vs rpm
i will try..
it's not sure that you will have usable torque there either
[19:44:26] <fenn> http://cgi.ebay.com/Large-BLDC-servo-motor-robot-generator-phase-converter_W0QQitemZ7555889474QQcategoryZ25290QQrdZ1QQcmdZViewItem
alex_joni: any particular reason why you wouldn't be able to use 4-bit binary counters in a homebrew quadrature counter?
I was able
but I needed to use lots of them
3 channels 24-bit
you do the math
why not just use 1 and let the PC remember the rest of the bits
er, if you 're using a pc that is
it counted faster than that
not very much flash
24*3 is not very much flash
er, you need ram not flash
* Jymmm flashes fenn
* alex_joni flashes fenn's ram
* Jacky^ erase all
.tell les Jacky^ need heeelp ! :P
.- . - -- . .-.-.-
Jymmm: not nice to talk dirty in here
alex_joni since when?
Jymmm: remember yucko the clown?
* fenn .o0( aet me? )
[20:15:34] <alex_joni> http://www.yourfilehost.com/media.php?cat=video&file=yukko_again.wmv
alex_joni: dou you think a mini-helicopter can be drived as a cnc machine ?
but it might.. :D
how would you know where it is?
found an interesting article here: http://pdv.cs.tu-berlin.de/~musial/bristol.pdf
it run linux, gps, autopilot ..
but not enough info :/
I built an autonomous helicopter a couple years ago
figuring out attitude is very difficult.
Lots of noisy, derivative signals
a frien of mine failed too ..
No, mine flew and was successful, mostly.
[20:19:06] <Jacky^> http://stor.altervista.org/4c/4c.php
* alex_joni suggests differential GPS
in order to autoland it required this very cumbersome radio differential GPS thing
he tried to 'copy' the draganflyer
I've been meaning to revise it, and to build a laser altimeter.. but
best I've seen was over DECT
alex: the only thing i used the radio dgps for was precise estimates of altitude
laser altimeter ? never heard.. interesting
icee: yes but you could get accurate positioning (about 1-2cm)
j: yah, you fm modulate a laser, and mix what you get back with your current modulation
yah.. accurate positioning would translate to better attitude estimates from the gps, too
that was my approach; using a 3 accelerometer + 3 gyro IMU i built to update a kalman filter with attitude estimates, and cleaning it up based on the macro-scale accelerations measured over GPS
when asked to hover the random walk was within a 15' diameter circle
which really isn't bad
icee: already know this ? http://robots.net/proj/Autopilot/
I originally bought one of rotomotion's boards to try and do this with
total piece of shit.
how was working ?
it had major noise and stability issues
im registered to the website since few days but not received passd yet..
the hardware, that is.
their software supposedly works well
try this out: http://y.20q.net/anon?K-k9gBgjZfZ7v-DWSIoIyQZhfvxK9lRTUYZUfIyFp2mIwQ,,d
alex_joni that was pretty good, short though =(
Jymmm: how short?
alex_joni only 5 minutes
Can someone (basically) tell me the diff with 1, 2, or 3 flute cutters?
the more flutes, the less removed per flute
fewer flutes are generally better at plunge milling, more flutes are better at surfacing, etc.
ok, what about cutout...
like if I wanted to cout out a 6" circle
out of what?
MDF or plywood
oh, for routing. hm. Out of my area of expertise
alex_joni: i maded the test but its wrong :/
I can do better,, i can do a miracle !
[20:46:12] <Jacky^> http://utenti.quipo.it/base5/scienze/f01gesu.gif
look the center of this image for about 30 sec
after look at the wall :)
hm I've got the new spindle bearings in place
look ath the 4 small points
an open and close the eyes
right.. maybe next tiem
Jymmm: the difference between flutes is what feedrate you have to keep to get the desired chipload
anonimasu what if I want to cut as fast as I can?
and also the stability of the cutter, 3 flutes are the most rigid ones, and 2 the least..
what rpm are you going to use?
do you have
and how fast can you feed?
and what chipload do you want?
I've been doing stepdown of .25 but want .76
like cutting out stencils
that's just a horsepower issue..
depth of cut isnt as relevant if you have the right chipload and enough hp..
not really... even at slow feeds I've snapped bits.
how fast are you turning your but=?
and how fast are you feeding?
this is just 3/4" MDF too
but I'd like get get away from the three passes
what size of bit
from 1/8 to 1/4
I mean there has to be some significant reason for having various number of flutes that I'm not aware of.
That's what I'm really asking about.
surface finish and material removal..
Jymmm: are you roughing first ?
Jymmm: so you have 0.13 per tooth of feed?
I need to order some more bits, and they have 1,2, 3 flutes and I'd like to know the diff/purpose
This is in general, not specific chipload.
Jymmm: that's all I can say, there's issues with more then 3 flutes in alu..
ok, then when/why would you use a 3 flute bit? Under what cercumstances is what I'm asking.
speed, accuracy, finish, material, etc
and if I need a higher material removal rate..
but when you mill al it's a matter of heat..
as I dont have any cooling
more flutes == better finish in general.
also, 3 flutes are better for killing resonance..
this is all plastic/wood
less flutes == faster cutting
no that's wrong..
more flutes = more teeth
more cutting edges..
that means higher feed to obtain the desired chipload..
icee: less flutes means you need higher RPM, not feed
* anonimasu nods
I'm just saying what i just read on the freud site :P
it's -10c outside now
is 1/8 " = 3.17 mm ?
it seem to me too small
i'd use 10 mm for the first pass :P
Jacky^: Sometimes not small enough.
i prefer biggest bit
[21:03:30] <icee> http://www.techsavvy.com/industry/file/national/03txp/nap09.html?id=118358&comp_id=03TXP&base_region=*
another reference saying what i said:
Micro-Grain/Solid Carbide Bits
The single flute design facilitates high feed and material removal rates
The double flute is designed for smoother finishes
[21:05:06] <icee> http://www.amanatool.com/faqs_st.htm#question8
When should I use a single flute, two-flute and three-flute bit?
Single flute bits are primarily used for cutting to size when speed is more important than finish. Two and three flute bits are used when finish is more important then speed. The more flutes you use the slower the feed rate
Jacky^ oh you do not!
long time no see
Jymmm: anyway, it seem to me hard to find best performace changing jobs often
if the model is only one, after a bit of 'hacking' is not difficult to fine the best way..
Jacky^: It's more getting familure with various cutters and their capabilities
there are a lots of toolpath ways :)
toolpath is important too ..
maybe more than bit used
i mean strategy, not sure if term is correct
its hard enough to made manually a router job, with the cnc and toolpaths we can learn for years :(
cnc is easier then manual machining in many cases
although skill comes with years of practice :)
but who have a 'carpentier' experience have no difficult in many cases
at least, if hes familiar with the software
anonimasu: how much the price of aluminium there ?
I dont know
I can check it later
let me know
just curious :)
03alex_joni * 10emc2/src/emc/iotask/ioControl.cc: changed iocontrol.0.spindle-speed-out to go from -speed to +speed
my card is running again :-D
i have added a request_mem_region
now it is in /proc/iomem also
hm, Paul is not here to say thanks
Yea! Driver is "done" :-)!!!
K`zan: what driver ?
AVR/ULN2803 to interface with my (cheapo) steppers and EMC.
right today i received the geckos too :P
tomorrow i will tri to run them with a small motor ..
[22:13:46] <K`zan> http://wrlabs.shacknet.nu/~vw/CNC/adriver-M16-1.pdf
Nice, but WELL out of my budget :-).
Decided to get the HobbyCNC 3 axis driver, but my steppers don't draw enough.
The way these things are supposed to work is that you look at one signal to change state (say A), and when it does, you look at the state of the other signal. Then you look for the other signal to change state (B in this case) and sample the first signal. By alternating back and forth this way, you guarantee that the number of interrupts (or edge transitions) that you care about is limited...
I just saw the discussion of quadrature counters. It is NOT as easy as it sometimes seems. You should NOT interrupt on both edges of one of the signals. Suppose the encoder hovers around one edge (say there is some vibration). Interrupt, interrupt,...
...by the rate of rotation (for rotary encoders) or of motion (for linear encoders). Doing this has the downside that it introduces hysteresis of one edge (or one count) into the system. But it is the only way that is guaranteed to work.
Sooo, until I get "real" steppers (draw over 500mA) I decided to roll my own :-).
ler: or you can use hardware that samples B on the edge of A
Now to see if EMC works with it :-).
ler: like the quadrature decoder in dsPIC*
lerman: nice to see someone grasping the idea finally :)
alex_joni: I grasped the idea about thirty years ago :-). But this is the first time I've found someone to agree with me. ;-) Just goes to show that great minds think alike.
* alex_joni mind is telling me not to fool around and buy some decent drives
and in case I do something stupid like building my own, to use proper chips
like the LS7166 I was talking about
Well, do you want to build a tool or do you want to use a tool? (I suppose you could always build your own chips.)
That's chips as in integrate circuit, not swarf.
I'm burning the BDI-4.30.iso I hope that was a good choice :).
K`zan: what were the others?
I don't remember, live and some lesser versions were out there IIRC.
PC I mean
ahh.. ok then
* alex_joni remembers what a Tbird is
it's from the old days.. when I could still follow processor talks :D
:-), scrap pile here, prolly better than the K6/500 :) for this, or anything except possibly a server :-).
nowaday it's pretty weird :D
about twice as fast as the K6/500
Still doing sneakernet, but now with DVDs :-)
* alex_joni just remembered his old K7-550 on a ASUS K7M
the first one out there :
anyways.. going to bed now
catch you later
basic install ok or is there something in custom I might need ?
ok, basic it is.
[14:34:05] <dmess> hi
[14:34:27] * dmess (email@example.com) has left #emc
[14:35:29] <Jymmm> bye
[14:57:32] * dmess (firstname.lastname@example.org) has joined #emc
[14:57:55] <dmess> high all..
[14:58:06] <Jymmm> back again
hey icee got his surplus 1kw ac servo motors from ups
time warp... again...
they're awesome. :)
LawrenceG: taxes ?
I am jealous
well, they're still just large paperweights right now
until we figure out the drive ;)
LawrenceG: i received my drivers too today ..
but E. 103 tax, damn..
how it is calculated ?
j: that's up to your customs department
hey its your government... probably a % of value
Jymmm: on 420 euro I payed 103 tax..
so, should be proportional ?
and the weight ?
it just influence the shipping cost right ?
here, we have "free trade" with USA, but we get dinged for 7% provincial tax + 7% gst (goods and services tax)
20-30% is in the typical european VAT ballpark, right?
lawrenceG.. where are you??
i choosed ups, 67 $ few days from CA to IT
Canada, Vancouver Island
ok im in oshawa .near toronto
cool... did you buy any of the infamous motors
dmess: nice ive an haunt nera there :)
im wondering... WHAT to buy
dmess: wht you need ?
i haunt the province of ontario
dmess: the city is Hamilton
you can have it
[23:49:13] <LawrenceG> http://www.surpluscenter.com/sort.asp?UID=2005102417040240&catname=&byKeyword=yes&search=sanyo
the 300 watt w/o brakes, the 400w and the 1kw versions are sold out
dmess: aunt :)
aunt elena hehe
anyone already tried that motor ?
in the 2 feet ballpark
i have the motor here, and i've energized the brake so far.. will look at the encoder later tonight or tomorrow
good torque ?
haven't fired up the motor yet
have no drive.
thats the prob
but the motor should be great
i'm looking around for dc motors..
well, we're making a drive
should be fairly cheap.
just remember to put the BRAKE OFF into the GO command... or its NOT nice electronically.
supposedly the motor is good for 12 N-m instantaneously (the 1kW one)
icee: homebuilt driver ? nice
dm: well, we have current limiting etc
and it should become a following error and stop very quickly in emc
still cook SOMETHING... even a relay..
i gotta build the pIII-2.8 for this box... that surplus page just come up
you have these drives jacky??
ac drivers ?
i bought 3 G340
and rousted a lot of L298
but never tried with chicken ..