Metal casting - small parts for tool restoration?

I restore antique tools for which parts are not available. Can I carve molds in wood that could withstand the temperatures of casting brass or copper? Are there other mold material options? My needs are for the smallest parts. Larger parts are created on either the engine lathe or milling machine. Thanks for the course!

Paige Russell3 months ago

Hi Kevin,

That sounds like a great project! Lorddrake's reply below is correct, lost wax casting using a plaster mold is the most common way of casting medium/higher temperature metals like brass, copper, gold, and aluminum.

There are several types of RTV silicone rubber that you can use for casting low-temperature metal/alloys like tin and pewter (SmoothOn's Mold Max 60 has the highest heat resistance that I know of at 560° F / 294° C), but RTV silicone is NOT recommended for higher melting temperature metals.

Here are two instructables and an outside example that go over the lost wax casting process:




Hope this was helpful!


Lorddrake3 months ago

Would a plaster / lost wax method be the easiest way to do this?