From fm202@21:1/5 to All on Thu Dec 10 03:42:05 2015
1. Fill pattern > Fill Boundary > Click on top surface of Part to choose the face.
2. Pattern layout > Perforation pattern > input instance spacing 4mm, Stagger angel 30 deg, Margin 18.5mm(or any you want), and choose the one of the edge as pattern direction.
3. In features and faces, choose the Seed (Pin/hole) as features to pattern.
4. In Options, tick Geometry pattern.
5. Click OK.