I will be out of the office starting 05/16/2008 and will not return until
05/26/2008.
I will respond to your message when I return (Monday).
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Jim,
Most audio amplifiers have a large capacitor on the output to block DC
current. DC is not good for speakers. Class D power amps use PWM based
drivers that might work for driving motors. I am not sure but I don't
think they have the caps on the output. You would have to look at the
specs f
Yep. You got it
Jim C
Kirk Wallace
<[EMAIL PROTECTED]
company.com>
You have to reference the signal with it's counterpart. The signal should
have two pins, a plus and minus. A comparator would work to convert the
signal to a single ended (referenced to ground) signal.
or use a RS-422 transeiver chip (ST490AB).
Jim C
Based on the latency results (187525) you are not going to be able to run
EMC on that machine.
I had the same problem. The problem is most likely caused by running an
integrated video interface which
is sharing system RAM. You need to install a video card. Literally any
video card should work.
Gene,
I may have to investigate adding dampers like you have done. I didn't
consider adding it between the motor and the machine. I had always seen
dampers on the back side of the steppers.
Jim C
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Please, I did not in any way mean to be unfair to EMC. I did not mean it
in that way at all.
EMC is a fantastic program.
What I mean is that by doing the electronic gearing there is no way to
avoid a condition where a stepper motor is operating at a step rate where
resonance is present. It wil
Kirk,
Yes, I have used the dampers and they work well. My motors at home don't
have the dual shafts. I made due with some old motors. Things are working
well for me right now without them. I could run faster if I had them on
the motors.
Here are work, I have seen the results and it's not pret
Ian,
I am using the basic output from HAL via a 1284 parallel printer port,
(mode 2). The stepper motor drivers are just doing the chopping to limit
current. I didn't change HAL in any way.
The one thing you might try is to limit the acceleration.
I was surprised when I raised the motor voltag
Ian,
You Wrote:
"I am using a motor of indeterminate voltage (no plate on it) but which I
think is probably about 4.5 - 5 volt and I am driving it
with 12 volts. At this I can get a fair speed out of it but, having read
another post on this list which recommended using the highest voltage
possibl
I have a mechanical setup very similar to what you have described. I am
not using any micro-step of the motors
and have so far seen excellent results. My workspace is about 20 inches by
20 inches.
Here is a typical stepper motor spec for what you can use:
http://www.anaheimautomation.com/manual
Ian,
What is the "feed rate" units for the spindle? RPM or Rev Per Sec?
My initial look suggests the "scale factor" (13.333) needs to be much
higher.
Jim C
"Ian W. Wright"
Kirk,
I typically go to the web and "Google" for "C Language". Lots of really
good sites with examples.
Couple that I have been using:
http://www.imada.sdu.dk/~svalle/courses/dm14-2005/mirror/c/
http://en.wikipedia.org/wiki/C_(programming_language)
I have found that I no longer need to have a
Ah. How right you are!
Thanks, Jim C
ben lipkowitz
<[EMAIL PROTECTED]
r.org>
There have been several things I have noticed in the CXF files.
- All arcs in the fonts are done with counter clockwise moves (G3).
- Some of the radius are large (parenthesis has a 13 unit radius).
- There does not seem to be much thought into optimizing the commands
from a motion standpo
I converted normal.cxf to normal.ngc
I chose to make the arcs using a series of line segments (G1) using 5
degree units vs using the G3
command.
Here is a link to the file.
http://wiki.linuxcnc.org/uploads/normal.ngc
I will convert the rest of the fonts tonight.
Jim Combs - Lexington, Ky
---
Alex, Thanks for the wiki help.
Here is a link to the CXF format stuff.
http://wiki.linuxcnc.org/uploads/CXF%20Format.jpg
Jim Combs - Lexington, Ky
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Thanks for the pointers.
Jim Combs
Jon Elson
<[EMAIL PROTECTED]
ms.com>
I can't seem to get to that link. (At least from Lexmark) I will try it
from home.
Thanks, Jim C
"Alex Joni"
<[EMAIL PROTECTED]
I have built up a router table with XYZ motion stages. My intent is to
produce wood and
Corian type signs. I have EMC driving steppers via a 1284 parallel port.
It's working
out very well. Now I am looking for fonts in the form of G code. Does
anyone know of any?
I have code to resize and move
I seem to unable to operate a simple calculator these days.
You are correct, My math was way off.
Sorry about that.
I do wonder how accurate the positioning is for a 50 foot table
and how repeatable the positioning would be after a long move.
That would still be one impressive machine.
Jim Com
>>
>> Yep! Wilson machine bought a 50' x 4' CMM at a Boeing auction. Got it
>> cheap and spent a million moving it and
>> getting it set up again. And that was only a few miles.
>Holy COW! a 50 FOOT CMM? There must only be 2 or 3 in the
>entire US that big. (I can understand why Boeing would ne
John, Kirk,
Thanks so much for the help.
It was the ctrl_type = v,v,v that was the biggest problem.
I am off and running now with phased motor drivers.
Tonight, I can finish the wiring and then off we go.
If anyone is interested in the .HAL and the .INI files, let me know. I
didn't want to
cl
Hope posting this does not offend anyone, but here is the .hal file edited.
I commented out the old mode 0 lines and added in the mode 2 lines based on
my interpretation of the section 7 HAL documentation. Is there some other
file that I need to change or are all my troubles in these changes?
I h
Yep, I do get the real time errors. I have "fixed" most of the obvious
ones. I have my setup at home and for some strange reason my E-Mails from
home get bounced back immediately from the list server although I am
getting output from the server (different problem).
I will grab one of the error l
I am new to this, and need some help.
I am trying to setup a three axis mill using stepper motors and a parallel
port
to output the motor phases.
I have used the step wizard and that works but it defaults to mode 0 (step-
direction). When I change to mode 2 (Phase A/B), I get HAL errors. I have
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