The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at cutting velocity of 18 m/min is:

The ratio between two consecutive spindle speeds for a six-speed drill

1.	The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at cutting velocity of 18 m/min is:
A.	1.02
B.	1.32
C.	1.06
D.	1.82
Answer» C. 1.06

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The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at cutting velocity of 18 m/min is:

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