Whats the difference between mate and planar alingnment relationship commands in solid edge?

Why there are two diff commands mate and planar alignment when perform same operations?how different are they?

1 Answer

Mate and planar are different: Mate is when two faces are aligned with their normals on opposite directions; Planar is when two faces are aligned with their normals on the same direction. Imagine a book: when you open it on top of a table, two pages are shown and pointing out in the same direction (planar); if you now close the book, those two pages are now facing opposite directions (mate). HTH