I'm getting going with emc2, after not having done nc/cnc work for a
long time (like, almost 30 years ago, before software took me away from
machining as a career). I've been messing with the G41/G42 tool comp
stuff, and have the lead-in moves working correctly. However, I've got
a question...
I have run into the problem I see mentioned every now and then in the
archives, wherein the tool comp algorithm has problems with series of G1
moves that were generated by some higher-level application to represent
an arc. This makes sense, since emc2 can't maintain tangential contact
with the material path at the vertices on the tool path.
I was surprised to run into this, as my expectation was that these arcs
would have been represented by equivalent G2/G3 arc moves instead of a
series of G1 moves. So, I started digging into the code behind every
open-source package I can find, including OOdraw, inkscape, qCad,
pstoedit, hp2xx, dxf2gcode, codeg, and probably some others I'm not
remembering right now. I have also reviewed every vector-based file
format ever invented. I consistently run into the same problem as I try
to build a software tool chain: somewhere between the cad/drawing
package and the g-code generator, one of the apps is converting arcs or
splines to series of lines.
In my most recent attempts, the source drawing (OOdraw or inkscape,
exported to pdf, svg or dxf), has every corner radiused more than enough
to allow for the tool to make the cut. Unfortunately, I can't get those
radiused corners all the way down to g-code as arcs.
I am determined not to use windows, and also to avoid paying for
software if I can manage it. More as an experiment than anything else,
but I'm an old-school open-source guy and I just figured there would be
kickin' solutions for all this stuff in open-source space at this point.
What am I missing? How can I get a high-level 2d or 3d drawing all the
way down to emc2 in g-code such that arcs are represented as G2/G3 moves
instead of series of G1 moves?
Thanks!
-Al
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