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Table 4 Coding levels of input variables

From: Optimization of machining parameters and wire vibration in wire electrical discharge machining process

Level

Wt

Ws

Fr

Sv

-2

0.5

1

0

50

-1

1.5

3

2

60

0

2

7

4

70

1

3

11

6

80

2

4

15

8

90

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