HTMAA 2024 - Week 14

Composites, Molding, and Vacuum Bagging

For Wildcard Week, I focused on learning how to use vacuum bags for composite fabrication. The idea is to layer fiber (e.g., fiberglass or carbon fiber) and epoxy within a mold. Then, by sealing the part in a vacuum bag, air pockets can be removed and uniform pressure is applied, leading to a stronger final piece with a smooth surface finish.

I experimented with a 3D-printed mold. Although 3D printing can create complex shapes quickly, it is crucial to properly seal and release-coat the mold. Otherwise, epoxy can adhere to the plastic, making demolding difficult.

Hurco

Unfortunately, the epoxy bonded to the 3D-printed mold after all the hard work. This demonstrates how critical mold preparation is in composite manufacturing—using proper release agents or alternative mold materials can help avoid this issue.

During this time, I also had the opportunity to learn about 5-axis machining on a Hurco machine. Programmatic CAM in Fusion 360, for example, allows for the creation of complex shapes (such as propellers) that aren't easily programmed through manual G-code alone.

Assignments

• Design and produce something with a digital process (incorporating computer-aided design and manufacturing) not covered in another assignment, documenting the requirements that your assignment meets, and including everything necessary to reproduce it ✓