Table 1 Process parameters and their levels used for drilling.

From: A novel way to optimize the process parameters by integrating the grey relational coefficient and the combined compromise solution for machining the CFRP composites

Levels

Parameters

Spindle Speed (N) (rpm)

Feed Rate (F) (mm/rev)

Drill Diameter (D) (mm)

1

4500

0.1

4

2

6000

0.2

6

3

7500

0.3

8

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