Question

During orthogonal machining on a work piece of diameter 100 mm, the length of chip produced is 78.5 mm. The chip reduction coefficient is

• A. 2.5
• B. 4
• C. 0.25
• D. 0.4

Answer 1

The correct option is B 4

The chip reduction coefficient:
$r=\frac{t}{t_c}=\frac{l_c}{l}=\frac{1}{K}$

$K=\frac{l}{l_c}=\frac{\pi D}{l_c}=\frac{\pi \times 100}{78.5}=4.0$