Manufacturing And Production Technology
Lapping is an operation of

Smoothing and squaring the surface around a hole
Making a cone-shaped enlargement of the end of a hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Sizing and finishing a small diameter hole

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Manufacturing And Production Technology
Shrinkage allowance on pattern is provided to compensate for shrinkage when

The temperature of metal drops from pouring to room temperature
The metal changes from liquid to solid state at freezing temperature
The temperature of liquid metal drops from pouring to freezing temperature
The temperature of solid phase drops from freezing to room temperature

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