The smallest circle in the cam profile is:

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  1. prime circle
  2. pitch circle
  3. base circle
  4. pitch curve

Answer (Detailed Solution Below)

Option 3 : base circle

Detailed Solution

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Explanation:

A cam is a rotating element that gives oscillating or reciprocating motion to the follower which is another element of this machine by direct contact.

Base Circle: 

It is the smallest circle, keeping the centre at the cam centre, drawn tangential to cam profile.

The base circle decides the overall size of the cam and thus is a fundamental feature.

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Additional Information

Cam Profile

It is the surface area of a cam where the follower touches.

Base Circle

It is the smallest circle of a cam profile drawn from the center of rotation of the cam.

Trace Point

By this point, we can trace the cam profile.

Pitch Curve

This curve is generated if we assume the cam is fixed and the trace point of the follower moves around the cam.

Pressure Angle

It is formed between normal to the pitch curve and line of motion of the follower.

Pitch Point

At this point the pressure angle is maximum.

Pitch Circle

It is the circle which passes through the pitch point.

Prime Circle

This is a circle drawn tangentially to the pitch curve and concentric to the base circle.

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