Island pocketing problems

[Nils N]

I have two projects that I want to clean up the flat flange around my work pieces. the first one "PROJ 1" worked out great. I selected the outer boarder then the island boarders and the tool path did excatly what I wanted.

 

The second 'PROJ 2" I selected eveything the same way but it failed. One row it wants to cut on the inside instead of going around the outside edges. I've tried revresing the chains, didn't work; change sides didn't work. Nothing I do will get it to go around the islands. All chains were pick excacly the same so I'm not sure why one set is cut on the inside the other on the outside (like I want).

 

I looked around and found that 2d Area Mill in the Surface HIgh speed tool paths will get me what I need but I'm still stumbed as to why the island pocketing doesn't work.

[GuyW]

^{When you selected each chain were they pointing the same direction?}

[Nils N]

Yes, all in the same direction and all were pick from the upper left hand corner, which was how I picked them in PROJ 1

[GuyW]

Can you post the file so that others may interrogate it?