There needed to be special rods placed with the pattern when the sand was compressed around it, which would then allow the liquid iron to be poured in and air to escape.Once the iron had set the sand mould was broken open and the casting was ready to be machined and 'fettled'.patterns & practices offerings are organized in the MSDN Library into the following categories: In addition, a collection of Retired Content is available. To provide feedback about this guidance, or to get help with any problems, please visit the project's community site.This content is no longer maintained but is provided as a courtesy. The message board on the community site is the preferred feedback and support channel because it allows you to share your ideas, questions, and solutions with the entire community.
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While this was going on, the original pattern was already being set in more casting sand to thus repeat the process as many times as necessary.
The pattern maker required his own special set of woodworking tools.