... dr i dφi ( 12. 2.4) Equations ( 12. 2.1), ( 12. 2.3), and ( 12. 2.4) yield tan µ1 = − m 12 (φ1 ) ± m 12 (φ1 ) ( 12. 2.5) tan 2 = ± m 12 (φ1 ) ± m 12 (φ1 ) ( 12. 2.6) Here, m 12 = (∂/∂φ1 )[m 12 (φ1 )] Function ... 2p = 2a, − e2 and the gear centrode is an ellipse as well ( 12. 3.7) P1: GDZ/SPH CB6 72- 12 P2: GDZ CB6 72/ Litvin CB6 72/ Litvin-v2.cls February 27 , 20 04 0: 32 326 Noncircular Gears 12. 4 ELLIPTICAL AND ... instruments Figure 12. 1.6: Twisted noncircular gear 0: 32 321 P1: GDZ/SPH CB6 72- 12 P2: GDZ CB6 72/ Litvin CB6 72/ Litvin-v2.cls February 27 , 20 04 0: 32 322 Noncircular Gears The centrode of gear is represented...