Manufacturing And Production Technology
In a CNC program block, N002 GO2 G91 X40 Z40......, GO2 and G91 refer to

Circular interpolation in clockwise direction and incremental dimension
Circular interpolation in counter clockwise direction and absolute dimension
Circular interpolation in clockwise direction and absolute dimension
Circular interpolation in counter clockwise direction and incremental dimension

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

The metal changes from liquid to solid state at freezing temperature
The temperature of metal drops from pouring to room 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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Manufacturing And Production Technology
Fixtures are used

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

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