Not a great picture here, but basically I want to run a cutter around the whole of the perimeter of this part, but for some reason it stops and starts, leaving some parts of the profile out completely. No idea why this is.

http://pic16.picturetrail.com:80/VOL660/2777486/6910876/264898876.jpg

The most common reason for this happening is if the contour crosses over itself. Think of a figure 8 and the way it crosses over itself. Intersections like this really confuse SheetCam.

If you send me a copy of the job file, I'll take a look at it and see if I can find out what is wrong. Send it to les {at} sheetcam.com (replace {at) with @)