Hi Michael,
I was actually just responding to a guy in another forum who is having difficulty with "Corel Type" geometry in a Cad/CAM software.

It becomes apparent there as the calculations of the machining break down on the imported geometry with regard to "connectivity of the defined curves and tolerance settings of some contour functions".

Thanks for the info....

Hi Burr,

> I was actually just responding to a guy in another forum who
> is having difficulty with "Corel Type" geometry in a
> Cad/CAM software.

That may actually be due to a different problem yet.

One other thing that is not too unusual with 2D drawing programs is to make one of those 4 point curve segments be set up with the first 2 points stacked up right on top of one another.

That somewhat degrades the mathematics that is operating behind the curve definitions, and that kind of "stacked up" / duplicated points can cause problems with various CAD/CAM programs that want to do some more sophisticated processing of the curves.

It may be due to a choice by the user making the 2D drawing data to use a particular node type on the starting node of a curve like "collapsed start" or "collapsed end" maybe something like that. They might want to avoid that kind of node type and instead make sure they have a visible tangent handle on every spot.

- Michael

Thank you. Very good information.

Hi Michael,

Just back online - Your discussion with Burrman all seems logical. I understand the limitation with point bezier lines so your suggestion of picking a node and making it a corner is good for me.

Thanks, Matt