On Mon, 2007-07-30 at 12:04 -0500, Jon Elson wrote:
> Dave Engvall wrote:
<snip>
> > My local approach (read fix) is to declare a zero diameter tool and
> > then modify my tool table.
> >
> > Maybe one of the developers can explain how easy or difficult this
> > would be to fix/implement.
>
> I don't think it needs "fixing". It requires you to select
> lead-in and lead-out points that do not contain inside corners,
> and is strict about this. I have gotten it to work fine.
> Section 20.4 of this document
> http://www.linuxcnc.org/docs/EMC2_User_Manual.pdf
> shows how it works.
Jon, I agree with you. The way G41/G42 and the material-path
tangential travel requirements are implemented in emc2 make sense to me
(after about 10 hours of digging in, which I consider to be a pretty
short curve, thanks to good docs). I don't think it needs fixing
either, unless there's a bug in the G41/G42 stuff, but I haven't
detected any.
I do like the earlier suggestion about providing the option of
enabling/disabling the tangential contact requirements, if that is not
too difficult. Not because there's anything wrong with how it's
implemented, but just because there may well be situations that I know
tangential contact isn't going to be maintained, and I'm fine with that.
If it could be set in the .ini file, that would be very helpful.
Setting it in g-code would be even better, but I realize that would
start to introduce non-standard things into the interpreter and is
probably not a good idea.
I'm also going to look at some of the g-code converters you pointed me
to in your prior email, and keep working to get my software tool-chain
set up so I can get G2/G3 arcs to appear in my g-code without having to
hand-edit them in there. I know I can do that, because I have, I'm just
trying to avoid it.
Thanks!
-Al
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