Workshop Technology
A hacksaw blade cuts on the

Cutting depends upon the direction of force
Forward stroke
Both forward and return strokes
Return stroke

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Workshop Technology
Sand wash is a casting defect which

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

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Workshop Technology
In a compound die

Only one operation is performed at each stroke of the ram
Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram
Two or more cutting operations are performed at one station of the press in every stroke of the ram
Two or more operations are performed simultaneously at the single stroke of the ram

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Workshop Technology
A jolt machine is used to

Produce uniform sand hardness throughout the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Produce uniform packing of sand in the mould
Ram the sand harder at the back of the mould and softer on the pattern face

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