Planer Placement Face All design features,with exception of groove,require a planar placement face. -The planar placement face is a flat surface on which to place the design feature. Shanghai Jiao Tong University 4Shanghai Jiao Tong University 4 Planer Placement Face n All design features, with exception of groove, require a planar placement face. n The planar placement face is a flat surface on which to place the design feature