skunkworks: did you look over that document? http://emergent.unpy.net/files/sandbox/pluto_servo.html
jepler: yes. It looks good to me. Although I was really hoping to sue you when I drill a hole through my hand.
skunkworks: I figured you would
skunkworks: that's why you have two hands: one is the spare
once I get to the point of playing with it - I am sure I will have more questions.
I'm sure too
Hi jeff. typo at "The wire carrying the nInitialize signal"
Wish I had a pluto.
rayh: they are cheap
* skunkworks is cheap
* rayh is more cheaper yet>
How you doing today?
Good. No major issues ;)
rayh: if things go well - we should have another i/o board option. 72 i/o
The pluto doc says parport epp.
[14:23:32] <skunkworks> http://www.futurlec.com/PCI8255.shtml
separate from the pluto
cold up there? ;)
I'm over in Ann Arbor right now. Not bad at all here.
Is there a spec sheet on that board. I don't see a link.
They sent me the wrong cd. jepler has a chineese version of it - they are supposidly sending me the correct info.
babelfish won't convert it ;)
* skunkworks is trying to be funny
rayh: I'm not sure I understand what the typo is. Is it the word "wire"? I changed it to: The trace carrying the nInitialize signal is also available on the top
side at FPGA pin 81 or the nearby via.
probably I'm missing something here
I felt it *woosh* right over my head
jepler: I bet he means nInitialize which does look like a typo
I think he thought you ment initialize
oh .. no, the parallel port signal is really called nInitialize -- it's active low
Ah my problem. Dislyxia attacks again.
maybe I should just skip saying what the pin is called
I would need a pin number ;)
seeing nA instead of /A (or overbar-A) is strange to me
A jumper wire must be soldered from parallel port pin 16 to FPGA pin 51. ... The trace carrying this signal is also available on the top side at FPGA pin 81 or the nearby via.
not really... that's going to be pretty challenging for a lot of people
soldering to a .5mm pitch pin
at least it's on the end of the row
you say it has a via - I would find a small enough wire to fit through and solder that way.
just the parport end is a via
ooh, the documentation is still bad
it's not clear what "this signal" is
hmm need to find the altera pdf again
... The parallel port signal is also available on the top side at FPGA pin 81
I hate writing docs
so there is no via near pin 81?
ok I will shut up now
skunkworks: it's important that the documentation make this part clear, so please keep helping me find a clear way to say what I mean.
skunkworks: FPGA pin 81, parallel port 16, and this "nearby via" are all wired together already.
I got it - just took me a bit.
so pin 51 does not have a via near it.
You need to add a wire from one of those locations to FPGA pin 51, which doesn't have a convenient via or large-spacing pin it also connects to
clarity is not my best act.
that will be a pain. did you guys do it?
and just after that we discovered that the FPGA was damaged. coincidence?
hm .. I need to read the PDF again
I just realized that it's possible that only the user pins are 5V tolerant
and that's not a user pin
rayh: can most mill spindles stop and reverse without a lot of screwing around like switching gears?
ok.. glad I have not had time to play with mine ;)
jepler: try not to fondle the pci8255 board too much.. it is pretty sexy.
jepler: do you have the link to the pinout pdf?
eek again -- the pluto-p design uses VCCint = VCCio = 3.3v -- for VCCint that's inside the Absolute Maximum Ratings, but not within Recommended Operating Conditions.
VCCio is good at 3.3v, but VCCint is supposed to be under 2.625v
maybe this board sucks
skunkworks: this is the thai pdf: http://www.etteam.com/download/10PC_INTERFACE/1008/Man_ET_PCI8255_V3.pdf
skunkworks: is that what you meant?
(I ment for the acex chip)
so printer pin voltages to pin 51 was probably bad?
I haven't figured that out for sure one way or the other
let me just say that I'm not going to immediately wire the next one up that way
one of the first indications that something was funny was VCC going up to about 4V when plugged into the parallel port -- and that was after adding that jumper wire
jepler: I'm a little amazed we didn't make that connection
I'm making it now :-P
Hi cradek Yes reversing is a motor direction thing. Gearing is not usually the same.
I'm a bit confused, did you mean 'not usually'?
what I'm trying to understand is if most mill spindles can turn forward, stop, then turn reverse in a pretty clean way (for instance no "nudging" back and forth to get gears to mesh)
If the spindle is in one gear, it stays in that gear when the motor direction is reversed.
all of our spindles just switch motor direction.
that's good to hear
cradek: rigid tapping?
yeah but I'm only working on it in my head so far
:) I can see the issue with our big mill - the encoder is going to have to be right at the spindle for it to work.
yeah belts/gearboxes are trouble I bet
otherwise there is too much gear lash
do you count the pins counter clock wise?
on the fpga
* skunkworks isn't soldering anything yet ;)
skunkworks: yes. With the index mark on the upper left (parallel port connector on top), "pin 51" is the bottom pin on the right side, near the LED.
so pin 51 is on th right side - lowest pin.
probably wait to solder the headers in until this gets straitened out.
as jepler said - atleast it is on the end
cradek I mean :)
simple resister brige may work. one from the printer port pin - to pin 51 and then to ground. If that is the issue.
unfortunately, that's quite cumbersome
well, for now I'll just strike out that paragraph in the docs and look for something else when the new boards arrive
Other parallel port signals are connected to special-purpose FPGA pins, such as DCLK and DATA for the serial programming
so those pins can handle it?
that's the way the fpga4fun guy set the board up, is that enough of a non-answer for you?
I suppose you could probe the fpga pin - to see what the acutall logic voltage is. (compared to the printer port)
maybe they are doing some sort of reduction.
I don't think there are enough components whose purpose I haven't identified to do that
or not - I see traces going from the printer port directly to the pins
cradek: did you notice a difference having more than 5 pwm levels? ;)
yes it's much smoother and quieter
DaveE tuning directions are being added to my info.
skunkworks: you do know that we are lacking that info from the integrators Manual.. don't you
so please use some intelligible language when you write it :-P
That may be a good idea.
I'm surprised his moves end in the right place with I=0
but I agree finding good I,D are harder than P,FF1,FF2
cradek: ff1 might help getting rid of I
but without I you can push the axis off position and it won't really go back
skunkworks: pci-8255 arrived
you're not gonna eat it? are you?
jepler: cool isn't it?
alex_joni: over his head?
skunkworks: way and beyond
jepler must have very strange taste
jepler: what's the keyboard shortcut for program run?
Lerneaen_Hydra: mmmm crunchy
was it rohs or leaded?
I usually save the socketed componants for last.
leaded tastes better
but like most things, if it tastes good, it's probably bad for you :)
sometime I stick the solder in my mouth when I need an extra hand. probably bad huh.
explains a lot though.. doesn't it?
I don't do that
I don't plan to either
silver solder, possibly (that's the 60/40 silver tin solder)
definetly not the type with a flux core
flux smoke is bad, but it's the lead that eventually turns you into a drooling idiot
that's true, but the flux material itself is also toxic
hmmm - isn't it just some tree resin?
but hey, too much silver and you'll look nice too :p
hmm, afaik it's a concoction of various toxic stuff
there's acid core as well, which is certainly bad for you, but I thought the rosin core was fairly benign
skunkworks: which end do you stick in your mouth?
just like onion rings, don't eat too much, and don't worry about it
ugh - my wife just got home
and this is a bad thing?
normally that would be a good thing, but we found out today that our cdat is terminally ill
we probably need to have him put to sleep later this week :(
oh no, very sorry to hear that
me too, thanks
I'm sorry to hear that, too
did he have a long happy life so far?
he's 14+ years old, and I think he's been pretty happy
he wasn't too happy during the move from Austin, TX, but he's adjusted pretty well in the last 11 years ;)
a long happy life is the best any cat (or person) can hope for
and a short, reasonably happy death - don't forget that ...
and cats can have a long happy life with no suffering at the end, while people don't have the same privilege
yeah - funny, isn't it?
not the word I would pick :-/
but be glad you can do the right thing for him
funny "strange", not funny "ha ha"
(hope that helps a little) :-(
well - I've been thinking about it for a while - he's spent the last two days in my lap (more insistenyly htan usual), so I knew something was up
but when my wife comes home, goes ofer to pet him, then starts sobbing, it gets harder :(
heh -not much you can do, but thanks for the support
Sorry to hear that also. I dread the day when one of our dies. My wife will fall apart also.
I'll be the one in my household to fall apart
I grew up on a 'farm'.. It was rough when I was younger, but I think I am pretty numb to that sort of thing now.
although time will tell
yeah - we had 10-20 cats at a time when I was growing up - I've buried enough of them to be somewhat immune
not totally though :(
'don't name the chickens'
all of my previous cats have 'dissapeared' (probably hunted by wild animals like a fox or something) when they got old
I've found one or two in the cellar that did that.
I think Olliver (our cat) was looking for a place to rest last night - he was rooting around in boxes and behind stuff in my office
[20:28:36] <skunkworks> http://www.electronicsam.com/images/house/happycats.JPG
jepler: card has some nice weight to it. (smells good too)
skunkworks: :) nice cats. they tolerate each other? my two cats (sisters) don't get closer than 50cm to each other, and hiss at each other occasionally
skunkworks: well as you know I thought it smelled so good I couldn't resist eating it
jepler: you'll have to buy a new one before you can devel though
jepler will shit the correct code in a few hours :)
SWPadnos: that's a very vivid image
jepler: quick.. eat the pluto too
eat card -> shit driver. makes sense, no?
it will be a nice addition
if only coding was that automatic
getting the driver into the computer may be messy
yay .. scanner
maybe it's binary blobs