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Surface Finish in Machining Part - II

A cutting too...

Question

A cutting tool has a nose radius of $1.8 m m$ the feed rate for a theoretical surface roughness of $R_{t} = 5$ microns is

A

0.268 m m / r e v

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B

0.187 m m / r e v

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C

0.036 m m / r e v

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D

0.0187 m m / r e v

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Solution

The correct option is A $0.268 m m / r e v$
$r = 2.8 m m, f = ?$
$R_{t} = 5 m i c r o n s = 0.005 m m = \frac{f^{2}}{8 r}$
$f = \sqrt{0.005 \times 8 \times 1.8} = 0.268 m m / r e v$

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