Week 7 Molding and Casting

✅ group assignment: review the safety data sheets for each of your molding and casting materials, then make and compare test casts with each of them compare mold making processes

Marcello teaching wax machining and molding with OOMOO silicon

✅ individual assignment: design a mold around the process you'll be using, produce it with a smooth surface finish that does not show the production process toolpath, and use it to cast parts extra credit: use more then two mold parts

This week I wanted to make a MIT dome, the detailed features and under cuts are impossile to do in a simple 3 axis CNC setup, so I 3D printed the mold with Form 4 resin printer.

Mix the oomoo silicon to 1:1 ratio, pour in vacuum, and wait for it to cure. Because the mold has 3d feature, it is very difficult to release the silicon from the resin printed parts, so I decided on the go to just cut the mold open

To my suprise I made a reusable spilt mold, when I taped the pieces back together I was able to make more silicon molds

Mix the resin to 1:1 ratio, vacuum and pour in to the silicon mold. The first batch came out very nicely, I put a LED in one of the pieces

I did the same recipe, but the second batch formed a lot of bubbles after I poured the resin into the mold, not good looking!

I have to hide the bubbles (^_^), paint it is!