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07HEAD * 10/testing/: Log message
that's me, just ignore it
I'm not having too much luck finding a board
what kind of board?
I need a board to interface 3 stepper drivers and 1 pwm servo amp
thats going to be tough
most are aimed at one or the other, not a mix
yeah, I know
what kind of speeds do you need (encoder count rate and stepper step rate)?
using pure software generated steps, "pwm", and encoder counting, you can get to about 10K steps/counts per second
the servo amp is advanced motion controls......the stepper drivers are gecko g202
the servo amp actually expects PWM input?
I thought most servo amps were analog input
I'm pretty new at this, so I am still trying to figure most of it out
is there any data onlne for the servo amp?
yes...I was just looking for the link...i've seen it several times
[21:47:57] <|Magician|> http://www.a-m-c.com/download/datasheet/50a20.pdf
try that one...i believe its right, but i dont think i can open a pdf on this computer
that amp wants an analog input, not PWM
hum what do you think would be the minimum memory requirement to run emc
emc itself, not much at all
emc and linux, not even xwindows
the X windows and gui crap that goes with it, probably 64M min, 128M better
32 meg if without X
the model # of the servo amp is 50A20M-DM1
it's hard to boot in less than that
supposedly this thing actually came with linux
64 would be best. you can probably even run an X server in it.
but someone stole the disk chip
I've been meaning to bring over xemc from emc1, it works much better than tk on a light system, and is almost as functional (I used to use it)
Magician: the datasheet doesn't say what the DM1 means
other than that, it seems like a normal analog input servo amp
yes....I believe its just a code for who they made it for
It is on a dyna mechtronics lathe
I was already on the machine
no...it came new on the lathe
the problem with things like that is maybe they customized it a little for that customer
and you don't know what they did
the pins look pretty standard
they would be unlikely to change that
custom might mean they changed the input voltage range, or the tuning, or any number of other things
what are your thoughts?
I don't have thoughts
i am using the same type power supply that ran the system before...so the voltages should not be an issue....or thats what I thought
the original system had three stepper and one servo channel?
"Dont do that! You'll blow up the Y flux capacitor!"
the original ststem had one motherboard (power dist. board) three stepper cards, and a spindle interface card for the servo amp
the servo is on the spindle?
the spindle also had a encoders on it
you are right it is analog input
so you need one analog output, one encoder counter, and three step generators
I would like to make provisions for possibly adding encoders to two of the three steppers
one of the speppers controls the turret
steppers don't need encoders, and unless you get very sophisticated, steppers can't effectively use encoders
so adding them just wastes money
the x and z axis dont have them now...but the turret has an encoder that shows position
precise position, or just which tool is selected?
the actual tool position is probably determined by stops or something right?
(not by the stepper, the stepper just moves from one "notch" to the next, then a stop moves into the notch and locks the tool in place?
so that encoder is probably very coarse, you could to toolchanges with classicladder
unlock, start motor turning, when "encoder" says the right tool is close to the proper position, stop moving, and lock
yes....that was kind of what I was thinking...but I havent got that far yet
you have got it
so that won't even be an EMC axis
and unless you are trying for very fast chip-to-chip time during toolchanges, it can be controlled by a software step generator
I havent actually used EMC yet, so I am still unsure about its capabilities
emc2 can do a lot of custom stuff like what you are looking at
what is your budget?
ofcourse I want it as fast as possible....but I dont know how I am going to get there yet
when we first started talking, I assumed you were doing a hobby class machine, and was thinking of cheap solutions
What defines an LED's 'angle'? Is it the die itself or the encasing?
* fenn suggests getting it working, then trying to make it quick
jmkasunich That didn't help me in the least =)
what are you trying to figure out?
the angle (beam width I assume) is what it is
you don't like it, use a different part
so who cares what exactly determines it
unsure about budget
jmkasunich I have some 15 deg LED's, and if I can muck with the casing to get a bigger angle
30 deg would be nice
going wider is probably doable
jymmm why do you want a wider angle?
Magician: do you know things like steps per inch, etc? do you know how fast the machine originally was (feeds and rapids)?
fenn why do you ask?
Jymmm: wont that cause more light leakage?
fenn yes it would
do you know what the critical angle is?
maybe he wants to see it from a wider angle
I am not real familiar with the machine...but I can find out anything I need to know about the way it was
I still have all of the original manuals
well, you can't even begin to pick out cards until you know what performance you are aiming for
jymmm you know what would be cool
there is some not terribly hard math that will tell you the step rates you need
but you _must_ have the data
custom lighted dashboard gauges
fenn solar powered EL lighting?
looking at cards before you get the data and do the math is a good way to waste money on stuff that is either overkill or won't meet your needs
dunno how to make the needle glow though
fenn: dayglow paint
I would rather go overkill, and leave myself room for improvements in the future
you are right...I expect to make mistakes for sure
I have prbably already made a few mistakes
kinda feels like i'm pissing in the wind
* fenn knows the feeling
buy it now buy it now
this will be way cool if it works though