Faceplate 1 rotates about fixed axis A and is connected by turning pair B to planet gear 2 which meshes with fixed sun gear 3. Crank 4 is rigidly attached to gear 2 and is connected by turning pair C to slider 5 which moves along slot a of plate 6. Plate 6 moves along guides b-b of faceplate 1. The axes of slot a and guides b-b are perpendicular to each other. Gears 2 and 3 are of equal pitch diameters. When faceplate 1 rotates, points of plate 6 describe oval curves. If a workpiece is clamped to plate 6, nose D of single-point lathe tool 7 turns the workpiece to the shape of oval d.
$2544$LrG,FD$