Table 1 Input process parameters and their levels.

From: Evaluating microstructural and machine learning predictive models for friction drilling of sustainable snail shell reinforced aluminium matrix composites

S. No

Input process parameters

Levels

-1

0

1

1

Rotational speed (rpm)

200

300

400

2

Feed rate (mm/rev)

0.0021

0.0045

0.0086

3

Workpiece thickness to tool diameter ratio

0.07

0.14

0.22

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