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

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Manufacturing And Production Technology
Fixtures are used

For holding the work in milling, grinding, planing or turning operations
For holding and guiding the tool in drilling, reaming or tapping operations
To check the accuracy of workpiece
None of these

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