Monday, September 19, 2011


Undercuts are indentation or projection on the walls of a plastic part which interfere with simple ejection from a two part mold; hence they must be avoided wherever possible.
·         Undercuts unduly complicates the mold design and increases the cost considerably because special split molds are required, retracting mechanisms may be required etc.
·         Internal undercuts require more expensive tooling than the parts with external undercuts.
·          Post mold machined undercuts are often cheaper than those molded in, especially external undercuts and circular undercuts.

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