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 standpoint.
For instance, the number '0' is ten different arcs and they are not in any
particular
order. My code does not attempt to optimize anything, I just convert each
of the
commands to G-code and leave it be. The result is a lot of unnecessary Z
axis
moves that could be removed. That's something I will deal with later on.
I am pleased with the results. The fact that I loaded EMC on a cheap PC
and
can run stepper motors via the parallel port is amazing. My formal
education
included automatic control systems (30+ years ago) and I understand enough
about what is being done to be very impressed. During my initial setup, I
discovered my motor drives were taking almost a millisecond to make a
single motor step yet EMC was sending step commands out much faster
(10 micro-seconds). That caused me to change to simple motor drivers
and let EMC handle the actual motor phasing. That did the trick for me.
It all works and now I have a really cool machine that does what I need.
I understand the limitations of steppers vs servo systems and went with
steppers just so I didn't have to deal with encoders. It's a little slower
but
much more simple. I like to keep it simple. It's magic to watch the
machine
run.
I am not familiar with python. I have no idea what AXIS is either. So for
now,
I have to stick with C. I need to take a look at python just to learn
about it.
I am new to this group and appreciate all the support.
Thanks to everyone!
Jim Combs - Lexington Ky
ben lipkowitz
<[EMAIL PROTECTED]
r.org> To
Sent by: "Enhanced Machine Controller (EMC)"
emc-users-bounces <[email protected]>
@lists.sourceforg cc
e.net
Subject
Re: [Emc-users] Fw: Request for
02/14/2008 09:12 Fonts
PM
Please respond to
"Enhanced Machine
Controller (EMC)"
<[EMAIL PROTECTED]
sourceforge.net>
Inspired by Jim's example I decided to make a python script that converts
cxf to g-code on the fly:
http://fennetic.net/pub/irc/cxf2g.py
http://fennetic.net/pub/irc/cxf2g.png
It uses g2 and g3 for arcs. The interface is non-existent right now; just
edit the script and open it with AXIS.
-fenn
On Thu, 14 Feb 2008, [EMAIL PROTECTED] wrote:
>
> 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
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