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MACHINES AND MECHANISM


UNIT I - MECHANISMS (14 hours)
Introduction - Links - Pairs - Chain - Mechanism - Machine structure - Degrees of freedom - Fodur bar chains - Terminology and definition - Planer, Spherical and Spatial Mechanisms - Grashoff's law - Kutzback criterion - Grubler's criterion for plane mechanism. Inversion of mechanisms - Four bar, single slider crank and double slider crank mechanisms - Simple problems - Instantaneous centre - Kennedy's theorem -Velocity and Acceleration of Four bar and single slider crank mechanisms by relative velocity Method.


UNIT II - CAMS (10 hours)

Types of cams and followers - Follower motion - Uniform, Parabolic, SHM and cycloidal. Cam terminology - Cam profiles construction for roller, flat faced and knife edge follower types - pressure angle - Derivatives of Follower motion - High speed cams - circular arc and tangent cams – Standard cam motion - Pressure angle and undercutting.

UNIT III - GEAR TRAINS AND CONTROL MECHANISMS (12 hours)
Spur gear terminology and definition - Gear trains: simple, compound, reverted and epicyclic - Velocity ratio and torque calculation in gear trains - Automobile differential.Gyroscopes: Gyroscopic forces and couple - Forces on bearing due to gyroscopic action - Gyroscopic effect in ship, motor cycle, car and aircraft.

UNIT IV - FORCE ANALYSIS (12 hours)
Inertia force and inertia torque calculations – D’Alembert’s principle – The principle of super position – Dynamic analysis in reciprocating engines – Gas forces – Equivalent masses – Bearing loads – crank shaft torque. Turning moment diagrams: Fly wheels -Application of flywheel - Punching presses.

UNIT V - BALANCING (12 hours)
Static and dynamic Balancing: Balancing of rotating masses - Balancing of single cylinder engine - Balancing of multi cylinder engine –partial balancing in locomotive engines – Hammer blow – Swaying couple – Tractive force - Balancing machines.
TOTAL : 60

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