Workshop Technology
When filing soft metals, the file teeth are clogged with minute particles of metal. The file should be cleaned by

Rubbing on wood
Washing it with water
Using file card
Washing it with dilute acid

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Workshop Technology
Notching is the operation of

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

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Workshop Technology
Sand wash is a casting defect which

Results in general enlargement of the casting
Occurs as sand patches on the upper surface of a casting
Results in a mismatching of the top and bottom parts of a casting
Occurs near the ingates as rough lumps on the surface of a casting

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