Injection Molding - Undercuts (How to Avoid and Design)

Learn what an undercut in injection molding is and how to design your part avoiding undercuts. We'll demonstrate how to re-design a part with an undercut in Fusion 360 using a shutoff.


00:00 Intro

00:23 Learn what an undercut in injection molding is. We'll demonstrate how an undercut makes it difficult for a part to be ejected from the mold.

00:50 We'll discuss the 4 main ways to avoid an undercut in injection molding.

01:01 Shutoffs explained. You'll learn how removing material under the undercut can help the part eject better from the mold.

01:26 Moving the parting line explained. This is the easiest way to avoid an undercut in injection molding.

01:42 Bumpoffs explained. Learn when and how to use a bumpoff for undercuts.

02:16 Sliding side-actions and cores explained. Learn to use side-actions when an undercut can't be avoided.

02:47 We'll remodel a part with a snap-fit feature and undercut in Fusion 360. You'll learn how to create a shutoff by making a cut out under the snap-fit feature. Finally, we'll add a draft angle to the design.


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