Chap, 5.2 The fundamental law of gearing(z) D2N202P r2 bI Const r2 b2 out Const 52 b2 The fundamental law of gearing The ratio of the driving gear radius to the driven gear radius remains constant as the teeth move into and out of mesh. . 2 1 2 1 1 2 2 1 2 1 2 1 2 1 2 2 1 1 1 2 Const r r r r m Const r r r r r r O P O P O N O N m b b i n out V b b i n out V = = = = = = = = = = = =         The fundamental law of gearing The ratio of the driving gear radius to the driven gear radius remains constant as the teeth move into and out of mesh. Chap.5.2 The fundamental law of gearing(7) r1 r2