Workshop Technology
Green sand is a mixture of

50% sand and 50% clay
90% sand and 10% clay
30% sand and 70% clay
70% sand and 30% clay

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Workshop Technology
Lancing is the operation of

Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal through part of its length and then bending the cut portion
Cutting a sheet of metal in a straight line along the length
Bending a sheet of metal along a curved axis

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