Here the process of molding is absolutely different from those described above. First a rough structure of the article is made by hand, using brick and loam sand.
It is then given the desired shape by means of sticklers and sweeps, thus avoiding use of pattern. After preparing the mold, it is baked to give strength to resist the flow of molten metal. This method of molding is used only for very large castings to be made in very small numbers.
This enables the saving in time, labor and material which would have been spent in making the pattern, but this system in not very much popular for the reason that it takes a lot of time in preparing the mold and requires special skills in the molders.
The sand to be used known as loam sand or loam mortar which is a mixture of molding sand and clay made in the form of a paste by suitable addition of clay water.
The cope part and the core of the mold are constructed separately on two different iron bases, using different sizes of sticklers and sweeps etc. and are assembled together after baking.