COURSE OUTCOMES
Upon completion of this course, the students will be able to
CO1: Discuss the simple mechanisms with suitable examples. (K2)
CO2: Determine velocity and acceleration of any point on a link in simple mechanisms. (K2)
CO3: Draw different cam profile for various follower motions. (K2)
CO4: Describe laws of gearing, types of gears, terminologies of spur gears and gear trains. (K2)
CO5: Discuss the concept of friction in drives and brakes. (K2)
UNIT I BASICS OF MECHANISM 12
Definitions – Link, Kinematic pair, Kinematic chain, Mechanism and Machine – Degrees of Freedom – Mobility – Kutzbach criterion (Gruebler‟s equation) – Grashoff‟s law- Kinematic inversions of four-bar chain and single 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).
UNIT II KINEMATIC ANALYSIS 12
Analysis of velocity and acceleration in simple mechanisms – Graphical Methods for relative velocity and acceleration polygons – Coriolis acceleration.
UNIT III KINEMATICS OF CAMS 12
Introduction – Terminology, Classifications, Types of follower motion – Uniform velocity Motion, Simple Harmonic Motion, Uniform Acceleration and Retardation Motion and Cycloidal Motion. Graphical layouts of cam profile – Knife edge follower, Roller and flat faced follower.
UNIT IV GEARS 12
Types of Gears – Spur gear terminology and definitions – Law of toothed gearing – Involute and cycloidal gear profiles-Interchangeability – Interference and undercutting. Gear trains – Simple, compound and Epicyclic gear trains–speed calculation.
UNIT V FRICTION DRIVES 12
Dry friction, Friction in screw threads – Friction clutch - types –single plate, Multi plate and cone clutch. – Block brakes, band brakes. Conditions for self-locking and self energizing.
L: 45; T: 15; TOTAL: 60 PERIODS
- Teacher: Dr KATHIRESAN M