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Calculation of Compulsory Approach and Drilling Time

The time take...

Question

The time taken to drill a hole through a $25 m m$ thick plate with the drill rotating at $300 r p m$ and moving at a feed rate of $0.25 m m / r e v$ is

A

10 s e c

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B

20 s e c

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C

60 s e c

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D

100 s e c

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Solution

The correct option is B $20 s e c$
Length of drill hole, $L = 25 m m$

$N = 300 r p m$

$f = 0.25 m m / r e v$

$drill time, T = \frac{L}{f N}$

$= \frac{25}{0.25 \times 300} = 0.333 m i n = 20 s e c$

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