What is the speed required to perform the operation of drilling a hole of 20 mm diameter at a cutting speed of 25 m/min?
A. 398 rpm
B. 492 rpm
C. 548 rpm
D. 624 rpm
Answer:A
What is the speed required to perform the operation of drilling a hole of 20 mm diameter at a cutting speed of 25 m/min?
A. 398 rpm B. 492 rpm C. 548 rpm D. 624 rpm