Loci in Epicyclic Gearing 20 December 2016, 22:00 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! R: pitch diameter of the fixed sun gear r: pitch diameter of the planetary gear k = R/r = 4 A point on pitch circle of the planetary gear traces a special hypocycloid: astroid (green) The blue slotted crank has 4 dwells in a revolution. « previous mechanism Nut-Screw Drive next mechanism » Disk Cam Mechanism load comments Please enable JavaScript to view the comments.