This 7.5 inch plaque was developed by the MGS Mfg. Group and is an educational tool used
to support the design, engineering, and manufacture of plastic injection molded parts. Mouse
and click the above plaque or buttons below to read detailed descriptions of each feature.

Undercut Examples
A feature that "is not" in the "line of draw" is an undercut. It will not release from the cavity or core steel without deformation of part geometry. Slides, lifters, collapsible cores, expandable collets, and other various methods can be used to achieve undercuts.

It is also possible to jump an undercut without moving tool steel. When the plastic is still in a semi-molten state or the undercut is slight enough, it can be possible to jump it out of the mold without damaging the integrity of the part. This will depend on how deep the undercut is, what angle it has, the type of plastic used, and the amount of cooling time has taken place.