Xin Wen

How to Make (almost) Anything

Week 8: Molding and Casting

cake making comes in handy


1. 3D Design a Positive Mold
2. Machining the Positive Mold with Machinable Wax
3. Casting a Negative Mold with OOMOO
4s. Casting a Positive Object with Drystone

1. 3D Design a Positive Mold

Figure 1. My inspiration for this week: artist Xu Bing's Square Wall Caligraphy.
Figure 2. My name in English Spelling written as a Chinese character.

2. Machining the Positive Mold with Machinable Wax
Figure 3. Left: preview of rough tool path; right: preview of finishing tool path.
Figure 4. Left: zeroing xy axis; right: zeroing z axis.
Figure 5. From left to right: the block moved in the middle of milling (you can see the two holes on the edges); the feedrate was too high so wax melted onto the flute, resulting in rough finish; I used a flathead screw and heatgun to smooth the surface; after clean up.
3. Casting a Negative Mold with OOMOO

Figure 6. From left to right: preparing oomoo; pouring it into the wax mold; first OOMOO negative mold (you can see part of it was missing because of bubbles)
Figure 7. From left to right: casting another oomoo mold; the wax mold broke when I tried to take oomoo out; second OOMOO mold
4. Casting a Positive Object with Drystone
Figure 8. From left to right: I enclosed the sides with cardboard to give the final cast more thickness; instructions on the drystone powder; poured mixture into the mold!
Figure 9. Left: solidified cast; final object!
Figure 10. Family Portrait!