Abstract
I created the system which designs the contour of the noncircular gear pair which corresponds to line of free pitch curve. This system, when information of three items (number of teeth, center distance, motion curve which is sought) is given, calculates the contour of the drive gear and the follow gear geometrically, and creates the design & manufacturing data with private CAD/CAM. The feature of this calculation algorithm is to create the pitch polygon which has the apexes whose number is the same as that of the teeth. The points in creating these polygons are to entirely make the length of each side the same, and to make the average length from the center to the apex as 1/2 of the center distance.
