Jun 26 2011

Cast Pewter Planet Brooch


Finished cast pewter brooch

I made this brooch as an 80th birthday present for my Gran. I came up with the idea of making a brooch involving some kind of planet design. It took quite a few revisions, but eventually I came up with something that I was happy with.

The construction involved CNC milling, silicone mould making and pewter casting to create the finished brooch.

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Oct 12 2010

Oogoo Heart Mold


After seeing this article on Hackaday describing an easy to make silicone casting  material I knew I had to give it a quick go.  The photos here show the results of making a mold of a polymer clay heart and then making a heart shaped ice cube from it.

Oogoo is basically equal parts corn flour and sealant, mixed into a white goo.  This Instructable has all the details for making Oogoo and fully documents its many uses.

Mixing Oogoo takes a bit of effort, I used a cardboard tub as a container and an old paintbrush handle to mix with, this probably made it more difficult than it needed to be  but that’s what I had to hand.

Once mixed, i found it quite difficult to spread over my heart form, next time i plan to wear latex gloves and shape it by hand.

Even with my shoddy mixing, crappy tools and less than ideal spreading technique, I ended up with a usable mold in around 2- 3 hours. To test it out, I simply filled it with water and froze it for an hour or two.

As you can see, the Ice heart isn’t perfect, but it’s pretty close.  A definite success!

In future, if I need to make a mold for any reason,  Oogoo is going to be my first port of call, its quick, cheap and absolutely stinks of vinegar. What more could you want?