On Sun, Aug 17, 2008 at 08:19:25PM -0700, Terry wrote:
>  Hi,
>   If this is something that is hard to fix then
> I am sorry for bringing it up.

Yep it is hard to fix, but don't be sorry.

>  I use CAM software to do most of my work,using
> tip comp (mostly .000 dia tool offset).The only way
> I can get it to work is by offsetting the geometry
> .005 or so and putting in a -.005 in the tool offset.
> This seems a hack way of doing this.

I have heard that a lot of cam-generated code doesn't work with emc's
cutter compensation because it depends on certain behavior in concave
corners.  Some will argue (just wait!) that the cam should give a path
that can be cut with the given tool.  That means there cannot be sharp
inside corners.  They are right.

Others will say lots of other controls will leave the round inside
corner automatically and not error.  They are also right.  I would
personally also like this behavior.

I've done a lot of work on this concave corner problem.  I have most
of a solution done.  The part that's done is the interesting part
(geometry problems) and the part that remains is the tricky part
(not changing the behavior of old programs, allowing extra moves or
operations in concave corners).

My work is in the cvs branch concave_comp; anyone who would like to
continue/finish the work is more than welcome to have a look.  Here
is one of my test programs that shows (all the?) various types of
corners.

http://timeguy.com/cradek-files/emc/concave.png


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