SummaryGreen rose Hypocycloid :) The eccentricity 1.2 (smooth), better if made from iron Rate reduction: (ratio) 1:42 (2 stages: 1:7 and 1:6) You need: 1 Bearing 625zz for out put 1 Bearing 607DDU (RBI) for Cam (out size 19mm, hole 6,7mm) M3x4 bolts for motor M4x4 bolts for mount 1 Bolt M5 make shaft out put Some washers more less 1mm Dimensions: 42x42x24,5mm