Graham,
Thanks for that, I see that you have trimmed the curve to form the glasses, I must appologuise for not being a little more clear....
The curve will be used to cut a MDF former, I plan to drilled a few holes in the top surface and sealed th side so that when I apply the vacuum to hold the polycarbonate lens material I won't (hopefully) loose any vacuum.
I have found an alternate method to give me a finishing cut on the surface of my MDF former (see attached)
selected the Z-axis as a theoretical 4th axis, although it created a 20,000 line G-code point-to-point program it was very smooth and fast (7min34sec) the cutter moves from front to back and then left to right
I am planning on cutting the the glasses shape using the feature Toolpath>translate>to_surface.
I hope that this feature in Mc9 wraps the glasses shape to the curved surface rather than, what I suspect will be a staight out vertical translation ( this will mean the glasses will be wider than I need them...
Anyway.....getting back on track!!!!, the Mc9 verify feature showed the tool path cutting from left to right in a vertical curve the cuter then moves accross and goes back to the left, moves across again and again back to the right.... yet (when I can get it into Mack3) the Nc file tells Mach3 to draw full circles much like grahams previous screen capture...
WHAT I find interesting is I HAVE HAD THIS FILE IN MACH 3 BEFORE but it now appears that ever line in the NC file that has G18 at the start of the G-code has an incorrect start / finish radius
isin't it the way... as usual once youv'e call for the TECH you can't repeat the origanal reported problem .... [ why Mach3 trys to cutt full circles and not just arcs]
As to the new problem [incorrect START/FINISH points]....Is it possible I have an incorrect POST or I have some how changed my Mach3 settings inadvertantly (you know.. something like when you set the chaining tolerance)