Question

A circle drawn with centre as the cam centre and radius equal to the distance between the cam centre and the point on the pitch curve at which the pressure angle is maximum, is called

(a) base circle

(b) pitch circle

(c) prime circle

(d) none of the mentioned

I have been asked this question by my school principal while I was bunking the class.

I want to ask this question from Cams in division Cams of Machine Dynamics

Answer 1

The correct option is (b) pitch circle

Explanation: Base circle is the smallest circle that can be drawn to the cam profile.

Pitch circle is a circle drawn from the centre of the cam through the pitch points.

Prime circle is the smallest circle that can be drawn from the centre of the cam and

tangent to the pitch curve.