Cam displacement diagrams and profiles (wedge and roller followers, all three motion laws), the loci of points on a mechanism, and the helix — cams, mechanisms and helix are three separate SAGS "Loci" course drawings, all covered here.
The Lesson tab teaches the hand-drafting techniques behind cam profiles and mechanism loci. For the full interactive version — a live displacement diagram AND cam profile that redraw and animate as you build up any sequence of dwell/rise/fall segments, in any order, with any of the three motion laws — open the Cam & Loci Simulator below.
Each exercise below prints as a full-scale A3 sheet — the same format used in EGD practical assessments. The reference thumbnail shows the completed drawing; redraw it full-size on paper using correct line types and true measurements. Use your printer's "Actual Size" setting (not "Fit to Page").