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

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Manufacturing And Production Technology
Which of the following statement is wrong as regard to down milling?

The chips are disposed off easily and do not interfere with the cutting.
The surface milled appears to be slightly wavy.
It can not be used on old machines due to backlash between the feed screw of the table and the nut.
The coolant can be poured directly at the cutting zone where the cutting force is maximum.

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