Unit 1
Basics of Mechanisms
Definitions – Link, Kinematic pair, Kinematic chain, Mechanism and Machine – Degree of Freedom – Mobility – Kutzbach criterion (Gruebler’s equation) – Grashoff’s law – Kinematic Inversions of four-bar chain and slider crank chain – Mechanical Advantage – Transmission angle. Description of common Mechanisms – Offset slider mechanism as quick return mechanisms, Pantograph, Straight line generators (Peaucellier and Watt mechanisms), Steering gear for automobile, Hooke’s joint, Toggle mechanism, Ratchets and escapements – Indexing Mechanisms, Steering gear mechanisms such as Davis and Ackermann Steering gear.