AutoCad 2007

[Ger21]

I think it is because you have used polylines and splines to create the parts of the drawing. I havent met a conversion program yet thet will handle them correctly for profiling.

Splines = BAD
Polylines = Good

I use polylines exclusively and Vectric's software works 100% of the time with my drawings.

Say you have a rectangular shape, and you want to start in the middle of the edge.
Here's what I do.

First, draw the rectangle. This will be used as a base for the final part.
Using the polyline tool, use a Midpoint or Nearest snap at the point you want to start. Then, click on the endpoints in the order (direction) you want the tool to go (Use running OSNAPS with Endpoint turned on). After clicking the last endpoint, hit "Enter" to exit the command. Now, delete the original rectangle, which should be visible in the open section of the new , open, rectangle. Then, select the new one, right click and choose polyline edit, and choose close.
Save as .v12 dxf and you should be good to go.

I actually use a macro that I wrote which exports g-code from within AutoCAD.

[Robin Hewitt]

I actually use a macro that I wrote which exports g-code from within AutoCAD.

Well done, most impressed. I baulked at working from within AutoCAD and took a different tack. I read a .dxf file and a .txt file that defines the missing parameters. I drive the mill directly, no G-code at all.

I looked at polylines, figured out how one magic number could define an arc but never wrote the interpreter. I just explode them before I export.

I found the trickiest bit was where the tool was too big to fit in all the little nooks and crannies, meaning I had to discard lots of entities. I did it, nearly, but should a pocket have a constriction below tool diameter I only get half of it. I found picking up on a sub-pocket surprisingly tricky, too easy to get phantoms. Remembering that a subsequent tool might have to do waste removal only on the uncut section was beyond me.

[Ger21]

Perhaps that is why you had problems stitching lines and arcs

With polylines, there was no need to attempt it, so no problems.