ME2203 KINEMATICS OF MACHINERY lecture notes | for MECH - III semester |by R.Anirudhan
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UNIT I BASICS OF MECHANISMS
Definitions – Link, Kinematic pair, Kinematic chain, Mechanism, and Machine. -Degree
of Freedom – Mobility - Kutzbach criterion (Gruebler's equation) -Grashoff's law25
Kinematic Inversions of four-bar chain and slider crank chain - Mechanical Advantage-
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.
UNIT II KINEMATIC ANALYSIS
Analysis of simple mechanisms (Single slider crank mechanism and four bar
mechanism) - Graphical Methods for displacement, velocity and acceleration; Shaping
machine mechanism - Coincident points – Coriolis acceleration - Analytical method of
analysis of slider crank mechanism and four bar mechanism. Approximate analytical
expression for displacement, velocity and acceleration of piston of reciprocating engine
UNIT III KINEMATICS OF CAMS
Classifications - Displacement diagrams - Parabolic, Simple harmonic and Cycloidal
motions – Graphical construction of displacement diagrams and layout of plate cam
profiles - circular arc and tangent cams - Pressure angle and undercutting.
UNIT IV GEARS
Classification of gears – Gear tooth terminology - Fundamental Law of toothed gearing
and involute gearing – Length of path of contact and contact ratio - Interference and
undercutting - Gear trains – Simple, compound and Epicyclic gear trains - Differentials.
UNIT V FRICTION
Dry friction – Friction in screw jack – Pivot and collar friction - Plate clutches - Belt and
rope drives - Block brakes, band brakes.