Manufacturing And Production Technology
Lapping is an operation of

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
Producing a hole by removing metal along the circumference of a hollow cutting tool

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

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