(right) Professor Bill Hole, College of the Redwoods, explains how to separate flexible molds from models.
A running mold designed to do mold a radial ceiling medallions (as seen below) |
Here students learn the basics of model and molds and how the shape of the model will indicate how easy it will be to remove the model from the mold. The extraction of the model form the mold depends heavily on what type of mold release is used and what is also referred to as "undercuts". Mold releases help prevent the casting agent from sticking to the interior of the mold. Mold release can be anything from shellac, potters soap, universal mold release, vasoline, and a few other commonly obtainable products. Undercuts are where the shape of the model has a negative profile or recesses on its surface which can create a area of contact that will not allow the mold to separate from the model
Students Jordan, Chris, Elliot, and Paul pouring up a three part split mold held together by rubber bands to keep its form |
Iron oxides were used to color this garland as an experiment in color pigmentation of plaster, as well as the decorative tile shown beloew |
Rubber Mold Compound used for making a very rigid mother mold that will produce numerous castings withous loss of details. (above is the two part mix with an abalone shell as the model)
2 comments:
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Thank you! we pride ourselves with the level at which our students learn and utilize the hands on education portion of our Historic Preservation program
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