Sand castings made from coarse green sand impart a rough texture to the surface, and this makes them easy to identify.
32.
When cast, chill casting is favoured over sand casting as this gives a finer structure that is more amenable to heat treatment.
33.
Navajo jewelers began sand casting silver around 1875; silver was melted and then poured into a mold, which would be carved from sandstone.
34.
The oldest surviving casting is a copper Mesopotamian frog from 3200 BC . Specific techniques include lost-wax casting, plaster mold casting and sand casting.
35.
Needham and Aguera y Arcas say they believe that Gutenberg employed a cruder printing method, sand casting, used at the time for making metal objects.
36.
Not only does this method allow manufacturers to create products at a low cost, but there are other benefits to sand casting, such as very small-size operations.
37.
Also, sand casting is plausible, but puts the time of invention later than my first guess . talk ) 01 : 07, 23 December 2012 ( UTC)
38.
Shell molding is similar to sand casting, but the molding cavity is formed by a hardened " shell " of sand instead of a flask filled with sand.
39.
The range of application of MAGMA solutions comprises all cast alloys, from cast iron to aluminum sand casting, permanent mold and die casting up to large steel castings.
40.
Needham and Aguera y Arcas say that Gutenberg, who never wrote down his printing methods, probably came up with the idea of using sand casting from his mirror making.
