Saturday, December 1, 2012
08 Joint Design Nº 24
I found an old burned-out incandescent light bulb that has a 66mm diameter, and I decided to try and make a ball mold using it as a pattern. I used some matte board for a build-up, and coated it with shellac. I cut out a 66mm hole with an X-Acto knife. The other piece is another piece of matte board with a 66mm hole cut in it, then cut in half, to use as a gage to get the light bulb situated in the build-up. The light bulb itself is sitting in a plastic cup with the bottom cut out of it. Click on any image to enlarge it.
After coating the matte board with a couple of coats of shellac, I placed coddles around it, and clamped them together. There is a mold mark inside, showing where to fill the mold with plaster. I am going to use plaster for this mold because I want to be able to cast several carving wax balls from it, over a period of time. Plaster has a better library life than hot-melt moulage does.
I used some coils of Roma Plastilina to seal around the bottom of the coddles.
The mold box is ready for the pour.
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