Move that circle off the leading edge so it doesn't touch and it should work.

 

Yep what Shaun said. I ran into this when I was designing my Pronto a few years ago. The LE is a dowel. I ended up making it out of balsa as I never could get the circle to cut on the LE the way I wanted.

 

Inside vs outside.... I think this is what you mean....Say you have a former with a lightening hole in the middle. You will need an outside cut to cut the out-line of the former... Then an inside cut to cut out the lightening hole. The reason for this is the width of the bit. Let's assume a 1/4" bit. To get the proper sized part, the script will move the cut line 1/8" outside (1/2 the diameter of the bit) of the part. It will also move the cutter in the proper direction to get the best surface on the part you want. Now to cut the proper sized lightening hole, the script will move the cut line it generates 1/8" inside. It will also reverse the direction of the cut so the best cut is on the piece you want.

In your rib, the 3 complete circles will be the inside cut, and the rib itself will be the outside cut.

As far as getting my partial circle... I abandoned that and went with a regular square balsa stick as the LE. In order to get it to work, you will need to move the circle half your bit diameter + say 0.01" away from the rib surface.

 

If you open up the front circle it will cut like you want just square of the points just a tiny bit.



Cheers
E-T Attached files

 

Hay E-T.. I tried that with mine, but it didn't work. I didn't even think about squaring the tip. That would (obviously ) done it. Now ya tell me

 

You dont have to square much just 1/64 or even less.

Cheers
E-T