Abstract: A mold base system for injection molding machines comprises two cast mold bases each with interior lugs. The lugs of each mold base removeably hold an insert. The inserts are machined to define a cavity that is the negative of the part to be molded. The inserts can be changed to suit different parts without changing the mold bases, which can stay on the injection molding machine indefinitely. Ribs connect the lugs to the mold base outside walls. Two ribs and an outside wall define a pocket that provides access to an insert. The ribs are notched to enable coolant lines to be routed without interference inside the mold base. The mold base system further comprises an ejector plate and a cap. The cap is changeable to suit different configurations of the ejector pins without changing the ejector plate.

Abstract: A mold base system for injection molding machines comprises two cast mold bases each with interior lugs. The lugs of each mold base removeably hold an insert. The inserts are machined to define a cavity that is the negative of the part to be molded. The inserts can be changed to suit different parts without changing the mold bases, which can stay on the injection molding machine indefinitely. Ribs connect the lugs to the mold base outside walls. Two ribs and an outside wall define a pocket that provides access to an insert. The ribs are notched to enable coolant lines to be routed without interference inside the mold base. The mold base system further comprises an ejector plate and a cap. The cap is changeable to suit different configurations of the ejector pins without changing the ejector plate.