Manufacturing And Production Technology
Tool life is generally better when

Grain size of the metal is large
Hard constituents are present in the micro-structure of the tool material
Grain size of the metal is small
None of the listed here

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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 clockwise direction and absolute dimension
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

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