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Consider the following statements regarding radial cam nomenclature: 1. Motion of the trace point describes movement of the follower 2. The curve generated by the locus of trace point is called cam profile 3. Actual working curve of cam is called pitch curve 4. Smallest circle that can be drawn tangential to cam profile is called base circle Which of these statements are correct? 

Consider the following statements regarding radial cam nomenclature: 1. Motion of the trace point describes movement of the follower 2. The curve generated by the locus of trace point is called cam profile 3. Actual working curve of cam is called pitch curve 4. Smallest circle that can be drawn tangential to cam profile is called base circle Which of these statements are correct?  Correct Answer  1 and 4 only

Concept:

A cam mechanism usually consists of two moving elements, the cam, and the follower, mounted on a fixed frame. A cam may be defined as a machine element having a curved groove, which, by its oscillation or rotation motion, gives a predetermined specified motion to another element called the follower.

  • Cam profile: The surface in contact with the follower is known as cam profile. this is the actual working curve of the cam.
  • Pitch circle: A circle from the cam center through the pitch point. The pitch circle radius is used to calculate a cam of the minimum size for a given pressure angle.
  • Pitch curve: The path generated by the trace point at the follower is rotated about a stationary cam.
  • Prime circle (reference circle): The smallest circle from the cam center through the pitch curve.
  • Base circle: The smallest circle from the cam center through the cam profile curve.
  • Pressure angle: The angle at any point between the normal to the pitch curve and the instantaneous direction of the follower motion.

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Fig: Cam Nomenclature

Related Questions

Consider the following statements regarding cams : 1. A cam in which the follower moves radially from the centre of rotation of the cam is known as a disc cam. 2. A globoidal cam is a double-disc cam, the two discs being keyed together and are in constant touch with the two rollers of a follower. 3. A conjugate cam can have two types of surfaces, convex or concave. 4. In a spherical cam the follower oscillates about an axis perpendicular to the cam, the axis of rotation of the cam. Which of the above statements are correct?  
What is the effect of the base circle on the follower? I) Follower velocity increases with the base radius. II) Follower acceleration increases with the base radius. III) Follower velocity and acceleration do not depend on the base radius.
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A cam should be designed only using uniform rise and fall within half of the cam, the remaining is dwell period, and without any dwell period in between the rise -fall periods and rise and fall periods should be same. The maximum rise in follower is 30 mm. How much the follower will rise when the follower is 120 degrees from its initial position of a cam?
A cam should be designed only using uniform rise and fall within half of the cam, the remaining is dwell period, and without any dwell period in between the rise-fall periods and rise and fall periods should be same. The maximum rise in follower is 45 mm. How much the follower will rise when the follower is 45 degrees from its initial position of a cam?
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