The pictures of pouring are from when I molded an aluminum flashlight reflector, and the mold pictured in the last step (and this step) is one of my ring molds.
Step 1: Materials
- A part to make a mold of
- Mold Max 60 Rubber (available from Smooth-On), or any other RTV (room temperature vulcanizing) rubber
- A mold box (can be any watertight container that fits your part)
- Clay for the sprue
Step 2: Spruing the Part
In my experience a good configuration is to put a large mass at what will be the bottom of the finished mold. This provides a large reservoir that “sucks in” the molten metal, increasing the chances of getting a complete casting even if you have thin sections in your piece.