Plaster Mold Casting
Plaster casting is similar to sand casting except that plaster of paris is substituted for sand as a mold material. Generally, the form takes less than a week to prepare, after which a production rate of 1–10 units/hr·mold is achieved, with items as massive as 45 kg (99 lb) and as small as 30 g (1 oz) with very good surface finish and close tolerances. Plaster casting is an inexpensive alternative to other molding processes for complex parts due to the low cost of the plaster and its ability to produce near net shape castings. The biggest disadvantage is that it can only be used with low melting point non-ferrous materials, such as aluminium, copper, magnesium, and zinc.
Read more about this topic: Casting (metalworking), Expendable Mold Casting
Famous quotes containing the words plaster, mold and/or casting:
“My father upon the Abbey stage, before him a raging crowd.
“This Land of Saints,” and then as the applause died out,
“Of plaster Saints;” his beautiful mischievous head thrown back.”
—William Butler Yeats (1865–1939)
“New York was a new and strange world. Vast, impersonal, merciless.... Always before I had felt like a person, an individual, hopeful that I could mold my life according to some desire of my own. But here in New York I was ignorant, insignificant, unimportant—one in millions whose destiny concerned no one. New York did not even know of my existence. Nor did it care.”
—Agnes Smedley (1890–1950)
“For the gods, though slow to see, see well, whenever a man casting aside worship turns folly.”
—Sophocles (497–406/5 B.C.)