What is the recommended maximum limit for the pressure angle in cam design________________?
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Answer: D. 30°
Explanation
The recommended maximum limit for the pressure angle in cam design is thirty degrees. Exceeding this thirty-degree limit causes excessive side thrust and follower binding in guides. Maintaining a lower pressure angle ensures smooth power transmission and reduces mechanical wear. Pressure angle is the angle between the follower motion direction and the normal to the cam profile. High pressure angles increase lateral loads, which can jam translating followers in their housings. Cam designers increase base circle radii to keep pressure angles within acceptable safety limits.
Automotive valve trains and industrial automation cams are designed with strict pressure angle limits. Proper cam geometry prevents premature guide wear and mechanical failure in high-speed machinery. Engineers balance cam size constraints against pressure angle limits during the design phase. Option A and option B represent lower angle limits that would require unnecessarily large cam sizes. Option C of twenty degrees is conservative, but thirty degrees is the widely accepted maximum threshold. Option E of twenty-five degrees is acceptable but less standard as the upper design limit than thirty.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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