Cam 1 oscillates about fixed axis A and has groove b whose theoretical, or pitch, curve is along a spiral of Archimedes. Follower 2 oscillates about fixed axis B and carries pin C which slides along groove b. The angle of rotation of follower 2 is φ₂=arctan((aφ₁*sin(φ₁))/(B͞A+aφ₁*cos(φ₁))) where φ₁ is the angle of cam rotation, B͞A is the distance between axes A and B, and a is the constant parameter of the Archimedian spiral. The position of point C on the follower is found by the equation B͞C=aφ₁*(sin(φ₁)/sin(φ₂)).
$3008$SmC,3L$