Manufacturing And Production Technology
A diamond locating pin is used in jigs and fixtures because

It has a long life
Diamond is very hard and wear resistant
It helps in assembly with tolerance on centre distance
It occupies very little space

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Manufacturing And Production Technology
Trepanning is an operation of

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

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

The temperature of solid phase drops from freezing to room temperature
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

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