Question

A cutting tool can be designated as:
$5-8-12-9-25-53-0.2$ mm.
(ORS) is used for machining. The normal rake angle of the tool is

• A. $8^{\circ }$
• B. ${12}^{\circ }$
• C. $9^{\circ }$
• D. $6^{\circ }$

Answer 1

The correct option is A $8^{\circ }$

Orthogonal Rake System:
$5-8-12-9-29-53-0.2$ mm

$i-\alpha -{\theta }_s^{\prime }-{\theta }_e^{\prime }-C_e-\lambda -r$

Here,
$i-\text{inclination angle}$
$\alpha =\text{side/effective/orthogonal rake angle}$
${\theta }_s^{\prime }-\text{side relief angle}$
$C_e=\text{end cutting edge angle}$
$\lambda =\text{approach/entering/principle cutting edge angle}$
$r=\text{nose radius}$

The normal rake angle of the tool:
${\alpha }_n={\tan }^{-1}(\tan \alpha .\cos i)=7.96$
${\alpha }_n=8^{\circ }$