Design Nomenclature / Physical Model Making
Sand casting
Also called greensand casting, greensand, sand moulding
Packing bonded sand around a pattern, withdrawing the pattern, and pouring metal into the cavity it leaves. The mould is broken up afterwards and the sand reused. Cheap at almost any size, but the surface arrives grainy and the pattern needs generous draft to pull out without collapsing the walls behind it.
Not to be confused with
Origin
The sand is "green" in the founder's sense of uncured, not the colour — greensand is damp clay-bonded sand, rammed and poured wet, never baked.