Question

a 40mm hole is drilled at a speed of 30 m/min and feed of 0.1 mm tooth calculate feed per minute

Answer 1

$D= 0.04 m$

$V = 30 \frac {m}{min}$

$f = 0.1\times 10^{-4} m$

Cutting Speed $= \frac {\pi \times D \times S} {1000}$

$S =\frac{30 \times 1000}{\pi \times 0.04}=238.73 \times 10^3 \frac {1}{min}$

Feed $= S \times f = 0.1\times 10^{-4} \times 238.73 \times 10^3 = 2.387$ feed per min