Question
Which of the following term defines the size of the cam?
The correct answer is
Base circle
Base Circle Defines Cam Size
The base circle is the fundamental circle from which the cam profile is generated. It's the smallest radius of the cam, measured from the cam center.
Its radius directly influences the overall physical dimensions and size constraints of the cam mechanism.
Understanding Cam Terminology
- Base Circle: The smallest circle concentric with the cam shaft, tangent to the lowest point of the cam profile. This defines the minimum radial boundary, hence the cam's size.
- Prime Circle: Refers to the circle in certain mechanisms (like gears), not directly defining cam size.
- Pitch Circle: Used primarily for gears, representing a theoretical circle where pitch diameter is measured. Not the primary determinant of cam size.
- Pitch Curve: The curve traced by the center of a roller follower as it moves around the cam. It defines the follower's motion, not the cam's physical size.
Therefore, the base circle is the term that defines the size of the cam.
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Important Questions from Terminology of Cam
The throw of a cam is the maximum distance of the follower from
Match the following parts of a cam to their descriptions.
Column I Column II 1. Pitch curve A. The smallest circle from the cam centre through the cam profile curve. 2. Pitch circle B. The path traced by the follower as it is rotated by a stationary cam 3. Working curve C. The smallest circle from the cam centre through the pitch curve. 4. Prime circle D. The surface of cam in contact with the follower. 5. Working circle E. Used to calculate a cam of minimum size for a given pressure angle. Angle of dwell of cam is defined as the angle
The angle between the normal to the cam profile and the axis of the follower is called the ________.
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