Week 10 molding & casting
by Moritz Begle & Chirag Rhangolia
Posted on April 14, 2013 at 15:00 PM
Project
The aim of this class assignment was to cast something through creating your own desing and milling a mold. The content of the class is listed up "here"
Together with Chirag Rhangolia we decided to use our resources together in order to be able to create our own individual designed chess out of Metal. As the Whole project contains a lot of single diffrent pieces each of us was able to go through each single step of the process. Starting with the design (rhino) that is based on their steps and movement, we created a positive mold that is being milled out of wax with the Roland. It is very important to put the walls of your mold into an angle of 15° in order that you can release the silicone easier.
As our mold wasn`t high enough for our design we had to create an additional frame around the mold in order to give the silicone a buttom thickness of at least 5mm. The silicone that had been used is called Mold MAX 60 as it is the only one that resists heat up to 300°C.
It features a low mixed viscosity and cured rubber exhibits very low linear shrinkage. Parts A & B are mixed 100A:3B by weight. Pot life is 40 minutes and rubber cures in 24 hours to a relatively hard Shore 60A. Talc powder is used to lightly dust Mold Max® 60 molds in order to reduce surface tension. Reducing surface tension enables the molten metal to flow evenly around the mold surface.
A detailed tutorial of casting pewter you can find "here"
The base had been engraved with the lasercutter and varnished.
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