For a given lift and angle of ascent, what is the effect of using a smaller cam base circle_______________?
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Answer: B. a large value of pressure angle
Explanation
Using a smaller cam base circle for a given lift and ascent angle increases the steepness of the cam profile. This steeper slope causes the follower to push outward at a sharper angle, resulting in a larger pressure angle. A larger pressure angle increases side thrust loads acting on the follower stem and guide bearings. The pressure angle is the angle between the direction of follower motion and the normal to the cam pitch curve. Cam base circle size directly influences overall cam dimensions, package size, and operating pressure angles. Keeping pressure angles within acceptable limits prevents mechanical jamming and excessive wear in follower mechanisms.
A smaller base circle creates a larger pressure angle rather than a small value of pressure angle. Cam geometry has a direct and predictable mathematical relationship with the resulting operating pressure angle. Stating that no relation exists contradicts fundamental principles of kinematic cam design and analysis.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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