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Disk cam-follower kinematics (Norton, Cam Design and Manufacturing, ch. 3). Synthesis uses dwell-rise-dwell-fall with three classical motion laws — sinusoidal (harmonic), cycloidal (sine-acceleration), and 3-4-5 polynomial. Pressure angle φ = atan(s′ / (rb+rr+s)) for the radial roller; design rule φ < 30° during rise. Cam profile rendered as the envelope of follower face positions; click Pause + Step to walk through the cycle.