This research aims to study the relationship between the size of the entrance hole with plastic work pieces. The size of the entrance hole, plastic, liquid injected into the cavity designs that differ in the injection each time. By learning to design molds that can adjust the size of the aperture, the entrance to the plastic. So while experimenting with injection molding, it can resize the holes in the plastic inlet. In experiments to determine the size of the hole, the entrance to all 4 sizes. Size of the piece of work that vary from 4 to study the relation of the size of the hole, the entrance to the plastic changes. From the results of the experiment found that when
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