Prototype molds can help you plan the placement of sliding pulls to achieve undercuts for complex features.
I know I've warned you away from undercuts,…and explained why they won't work…in a standard bivalve mold,…but what if your design absolutely requires it?…Many parts require additional moving pieces…as parts of the mold, which adds cost…for every additional pull.…They go by a few names; side actions, cams, and side pulls.…I like to call them pulls, because they are pieces…of the mold that hold in place during injection…and pull away so you can eject the entire part.…They pull perpendicular to the face…they're pulling away from,…but they also need their own draft…in relation to that face.…
The pull is like a tiny simplified mold…for specific features on your part.…It needs a draft in relation…to the direction it's being pulled.…Usually, pulls leave a mark, so if that bothers you,…try to incorporate the shape of your pull into your design.…The part end of the pull should match…the curvature of your part, even on a part…with drafted walls like this.…Pulls enable you to have undercuts.…Be mindful of designing a part…
- What are mold making and casting?
- Type of molds
- Designing a mold
- Types of casting
- Mold and box setup
- Complex molds
- 3D printing and CNC manufacturing for molding and casting
- Other molding processes
Skill Level Beginner
Prime Studio Product Designwith Stuart Harvey Lee14m 2s Appropriate for all
Rapid Prototyping for Product Designwith Gabriel Corbett1h 38m Appropriate for all
Rhino and V-Ray: Product Design Renderingwith Dave Schultze2h 54m Intermediate
Product Design: From Sketch to CADwith Jean Gorospe1h 16m Intermediate
Product Design: From CAD to 3D Modelwith Jean Gorospe1h 45m Beginner
What is mold design?1m 22s
1. What Is Mold Making and Casting?
2. Everyday Casting: Materials
3. Design Considerations for Molding
4. The Casting Process
5. What Prototyping Processes Tell You about Full-Scale Manufacturing
6. 3D Printing and CNC for Molding and Casting
7. Other Applications and Processes
Next steps1m 53s
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