Here, relationship of gate design and workpiece shape is explained with gate designs as examples.

(1) Spacer method・・・Used often when the workpieces are easily identifiable by top/bottom configurations.

Other gate examples

(2) Trap hole method ・・・ Used for complex and thin plate shaped objects that are required to be directionally aligned.

(3) Rail method・・・Used for sorting shapes and sizes of screws and pins