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Making moulds using CNC, with urethane foam, wax, silicone and epoxy

I’ve been doing a bit of work on making moulds for the injection moulder. I’ve been making the base moulds with urethane foam and machineable wax. The was is definitely better since the foam is too grainy. I’ve ordered some urethane boards that will probably be really good for this, but they haven’t arrived yet. If you’re interested in some pictures of the process, read on. I’ll be posting some videos later on.

Here is a picture of the CNC machining urethane foam. It has quite large cells so it doesn’t create very nice moulds, but it’s good to test the design.

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And here is a picture of the machineable wax I bought at Inventables, being sawed into suitable pieces.

2014-01-12 16.07.42And here are some pictures of the wax moulds:

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2014-01-11 11.55.14And some pictures of making the silicone moulds based on the wax (and urethane foam). I’ll post some pictures of the results also.

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And here I’m trying to use epoxy bought in a car shop. It’s a bit too grainy and the mould doesn’t turn out too well. I wonder if maybe I could use the epoxy that is meant for painting (more liquidy).

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