What is the geometric interpretation and visualization of a disk with negative radius?

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James F Peters Popular answer

This is an interesting question.

This issue of negative radius appears in

http://khartoumspace.uofk.edu/bitstream/handle/123456789/18081/Dust%20Storms%20Properties%20Related%20to%20Microwave%20Signal%20Propagation.pdf?sequence=1

https://arxiv.org/pdf/1504.05080.pdf

https://www.researchgate.net/publication/272064927_Design_of_the_Disc_Cam_Profile_with_Negative_Radius_Translating_Roller_Follower

https://www.researchgate.net/publication/258579253_Mechanical_Analysis_of_Disc_Cam_Mechanisms_With_Negative_Radius_Roller_Translating_Follower

https://www.researchgate.net/publication/239406357_Size_optimization_of_cam_mechanisms_with_translating_roller_followers

Article Design of the Disc Cam Profile with Negative Radius Translat...

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James F Peters

Muhammad Zubair Ahmad

@Peter Breuer, sir you just explained it only the alpha is negative. I has confused alpha with the radius when it was curvature.