Discussion
A scroll cam is required to convert uniform rotation into uniform radial movement. The profile needed is
Answer: B
Correct answer: an Archimedean spiral
Uniform rotation must produce uniform radial movement, which requires the radius to grow in proportion to the angle - precisely the Archimedean spiral. A logarithmic spiral would accelerate the follower as it went, and neither a cycloid nor an involute has the required constant relation between angle and radius.
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