[sshc-fig] Patterns patterns patterns

[Allan LeSage]

Hiya,

Some notes slash food for thought on making patterns for casting.

As of now we have some expertise in sand casting, note that 3-D printed
patterns for sand casting have to have *draft*, i.e. have to be shaped in
such a way that you can extract them from the sand.

https://www.google.com/search?q=sand+casting+pattern+draft&hs=QZJ&channel=fs&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiz05OUzsbYAhXBQd8KHfNkD_IQ_AUICigB&biw=1774&bih=1159

There's an art to making patterns for sand casting--indeed there's a
profession: when we're a little further along we should get Dan Meyer to a
FiG session and/or force-subscribe him to this list.  This being said the
fundamentals are just to use draft when modeling, e.g. 5 degrees.

We'd like to develop some expertise in using plaster molds and "lost
wax"--have any of us done this kind of thing?  https://youtu.be/UJT3kGbYjfI
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