Question

A sine-bar having a length of 250 mm with each roller having a diameter of 30 mm is used for taper angle measurement of a component. The vertical distance between the surface plate and the centre of the roller is 80 mm. The calculated taper angle (in degrees) is ______.

• A. 20
• B. 10
• C. 15
• D. 5

Answer 1

The correct option is C 15



Given data:
L = 250 mm, d = 30 mm

Refer to above figure,

$h=80-\frac{d}{2}$

= 80 - 15 =65 mm

$\sin \theta =\frac{h}{l}=\frac{65}{250}$

$\theta ={15.07}^{\circ }$