Define angle positions: define φ₁, φ₂ and center distance a manually with control points or import the values from CSV.
Define gear ratio function: define i with control points, a sinus function or CSV. Set the φ₁ start/end range and center distance a.
Manual definition: drag a control point to change its value. The calculated curves update continuously while dragging.
Canvas: use the mouse wheel to zoom and drag to pan. The scale at the left and bottom is in mm.
Animation: use |<, >/Ⅱ and >| to move through the motion. Fix 1, Fix 2 and Fix a select the reference frame.
Curve status: the bottom of the canvas reports whether Curve 1 and Curve 2 form a Closed loop or an Open curve.