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.
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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.
FREE injection molding manufacturing and design guide: 3dhu.bs/zeBYlu
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[@ethaneveraldo]

Love that you guys jump straight into Fusion and show a real life example.

[@alisadatakhavi]

Short, Direct to the point, followed with simple, clear example. Very helpful for beginners. Thank you

[@Zero-se4xb]

Love the young Howard Stark mustache!

[@avi34669]

This is a very practical example. Very typical issue you come across in part design for injection moulding. Nice work.

[@highkick1995]

Dude, I don't know how much i can thank you! I am busy with a study project and it was breaking my ballz. Muchas gracias mustachas

[@10karamel37]

your literally a life saver OMG THANK YOUU MY DESIGN IA is saved

[@dr.aniljavali3056]

NICELY EXPLAINED USING CHAPTERS.

[@Tydeyes]

Hey your ad worked! Great video. First youtube video I've clicked on from an ad.

[@technov1king]

nice explanation. Love it!!

[@vat_1989]

Beautiful explanation

[@PS77787]

Good video bro! Very informative

[@KurauPlastics]

Very good explanation. Good job

[@nurullahgozubuyuk1629]

Thank you very much

[@peekeeleealrahman5747]

Many thanks

[@KISHORENEDUMARAN]

nicely explained. the example was on point. I'd like to see some more f360 examples though

[@XerxesGustav]

You forgot to mention lifters, which is afaik the most common way to solve the undercut issue after shut-offs, since they are cheaper than side-action and more flexible in placement.. Furthermore minimum draft angle for a metal-to-metal surface in the mold is typically 3 degrees minimum. 1.5 degrees for that shut-off is very tight. Wouldn't it also be simpler to just extrude with a 3 degree draft from the undercut surface through the bottom of the part. That way you dont have to create a sketch, and you don't have to use the draft command, so fewer features on your timeline.

[@samgoldfisher2526]

This is great and interesting (as was the previous video). You do a good job and that's lovely! As a suggestion for this video and the previous one: adding a really simple simulation of the ejection will help a lot to understand how your solution actually helps. If you do compare side to side the initial model without shutoff and your result with a shutoff, I am convinced that anyone could understand that ;-) Anyway, you do a good job, thanks a lot. And now I am waiting for the third video ;-)

[@ProtolabsMFG]

Hi Thibaut, thanks for the compliment and feedback! We always strive to make the videos as clear as possible and we will absolutely consider your suggestion.

[@samgoldfisher2526]

@@ProtolabsMFG You do an amazing job ;-) ! Keep going, that really interesting

[@josiaspereira984]

Fantastico!!!

[@elyesmrabet17]

thank you

[@sunilmanwani9289]

As someone new to injection molds its quite confusing all the terms you mentioned. Anways Good job

[@akay435]

Thanks

[@varunm7011]

any videos that cover , tips to maintain uniform wall thickness ?

[@ArtisanMouldcoltd]

good and helpful , We are a company supply plastic injection tooling and moling

[@broughttoideas]

Wow I would like to say that I understood that but I definitely didn’t understand the undercut great quality thou

[@ProtolabsMFG]

Hi, sorry to hear that! Is there a specific part you would like to know more about?

[@broughttoideas]

@@ProtolabsMFG I don’t understand how the undercut made it easier to remove from mold

[@Crokto]

so something im working on is basically a box, but it would require a straight up hole (or two) in the side...seems like my only options are side action & changing the parting line, and changing the parting line would just create more undercuts...

[@danilolobo1167]

Could you recomend a book to study about this?

[@dunichtich100]

But if you don't want a hole in the bottom of your part you need a side slide, correct? 😅

[@nileshgound3046]

Why business I'd required for downloading this pdf. What if there a student need that kind of knowledge? Please do something about it... I am just a learner not a businessman.

[@emirhan4870]

Türkçe çeviriyide eklermisin ?

[@abuzarmustafa9364]

I subscribed to you... now give me a handbook

[@rishaansomur8449]

Is this Howard Stark 😂😂😂😂😂😂😂😂