Manufacturing And Production Technology
The facing is an operation of

Embossing a diamond shaped pattern on the surface of a workpiece
Machining the ends of a workpiece to produce a flat surface square with the axis
Reducing the diameter of a workpiece over a very narrow surface
Beveling the extreme end of a workpiece

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

Circular interpolation in counter clockwise direction and incremental dimension
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

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Manufacturing And Production Technology
Trepanning is an operation of

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

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