Chap, 5.2 The fundamental law of gearing(1) 1. The Fundamental Law of Gearing Tooth profile 1 drives tooth profile 2 by acting at the instantaneous contact point K. N,N, is the common normal of the two profiles velocities V, and v, at point K, along N, n, are equal in both magnitude and direction otherwise the two tooth profiles would separate from each other. ON O=O2N2 O2Chap.5.2 The fundamental law of gearing(1) ▪ Tooth profile 1 drives tooth profile 2 by acting at the instantaneous contact point K. ▪ N1N2 is the common normal of the two profiles. ▪ velocities V1 and V2 at point K, along N1N2 are equal in both magnitude and direction. Otherwise the two tooth profiles would separate from each other. 1. The Fundamental Law of Gearing 1 1 1 2 2 2 O N  = O N 