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

This question belongs to Mechanical Engineering Manufacturing And Production Technology
Manufacturing and Production Technology
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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 a cutting velocity of 18 m/min is

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Correct Answer: Option B
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2 Comments
Madhavan Palmani
Madhavan Palmani 7 years ago
V=π*D*N/1000.
So, N1D1=N2D2.
N1/N2=D1/D2.
=25/6.25.
=4.

NOW,
(Nmax/Nmin)^1/(6-1).
=4^(1/5),
=1.319,
~1.32.
Prince Sabhaya
Prince Sabhaya 7 years ago
(25/6.25)^1/6-1
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