Rise — follower moves away from the cam centre   Dwell — follower stationary   Fall — follower returns towards the cam centre. Uniform velocity gives a straight-line displacement graph (constant speed, abrupt direction change); harmonic motion (SHM) gives a smooth sine-based curve (gradual acceleration/deceleration throughout); uniform acceleration/retardation gives two parabolic curves joined at the segment's mid-point — constant acceleration for the first half, constant deceleration for the second half. Segments can be added, removed and reordered freely — a real cam can dwell, rise, dwell, rise again and fall in any sequence, not just one rise-dwell-fall cycle.