Feeding speed (m/min)

Drilling torque (N・m)

Feeding resistance (KN)

Maximum value (N・m)

average value (N・m)

standard deviation

Maximum value (KN)

average value (KN)

standard deviation

0.3

358.7

344.6

11.6

1.61

1.44

0.20

0.5

384.3

366.4

14.3

5.0

2.55

1.11

0.7

421.6

356.1

15.3

4.6

3.56

1.56

0.9

423.6

399.6

20.6

6.0

4.11

2.30