For more how-to, visit www.castcraft.com
Castcraft Books and Videos show:
- How to make molds
- How to make concrete molds
- How to make plaster molds
- How to make RTV rubber molds
- How to make latex molds
- How to make silicone molds
- How to make polyurethane molds
- How to make a vacuum forming machine
- How to make a concrete birdhouse
- How to make concrete pots or concrete pottery and concrete bonsai pots
- How to make latex rubber masks
- How to sculpt
- How to make props
- How to use polymer clay.
- How to make clay characters
- How to make one part molds
- How to make two part molds
- How to make injection molding molds
- How to make an injection molding machine
- How to melt metals
- How to melt aluminum, brass, bronze, iron
- How to make sand molds for metal casting
- How to make sand molds for concrete
- How to make a trellis from copper pipe
- How to make fake rocks, fake boulders
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HOW TO MAKE A TWO-PART RUBBER MOLD OF A COMPLICATED MODEL How to make a silicone rubber mold or a polyurethane rubber mold. How to make an RTV rubber mold. You
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The first photo shows the original model for which we want to make
a mold. What makes this model complicated is:
2) The first step is to un-complicate the model as much as possible before making the mold. We can make this model much less complicated simply by removing the horse from the base. The base by itself is a very simple mold - just put it in a container, seal the bottom edge, and pour liquid rubber over it. After the horse and the base are cast separately, they can be put back together. This also allows for the flexibility of putting the horse on a different base, or not using a base at all. If you are the creator of original sculptures that you will eventually want to make molds from, always sculpt the main figure separate from the base. And make other parts as separate objects also. For instance, if this horse had a rider, you would want to sculpt the rider as a separate object. If the horse was tied to a hitching post, you would want to sculpt the hitching post separately, and so on. To make a two part mold of this horse, we will first bury the horse in clay, so that one half of the horse is in clay, and one half of the horse is exposed. This means one half of the body, one half of each leg, one half of the head and neck, and so on. The clay will form what is called the “parting line”. There is no requirement that the parting line be straight. It can undulate however necessary to follow the curves of the model. 3) Use a pallet board. A good pallet board is a large plastic board such as those sold as kitchen cutting boards. Roll out a slab of clay about ½ inch thick on the pallet board, and lay the horse on it.
Take small balls of clay, and push them into place around the horse so they come to the approximate parting line.
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