Machine Design 1
MEC-212
Introduction: Systematic Design Process (SDP), Basic principles for mechanical design, Use of standards. Manufacturing consideration in design of casting & machining parts. Dynamic and fluctuating stresses, fatigue failure and endurance limit, design under combined direct & varying stresses. Stress concentration, causes and remedies in design. Factor of safety and its affecting factors, Tolerances and fits as per BIS, Materials selection, Designation of steels. Detailed design procedure of Spigot & Socket Cotter joint, Knuckle joint, Pipe joint. Numerical Design Problems.
Shafts, keys and couplings: Transmission Shafts, materials, design of shafts on strength & rigidity basis... Design of rigid and pin-bushed flexible couplings. Levers, types, Design of Bell crank lever. Springs and their applications, design of close coiled helical springs. Numerical Design Problems.
Riveted & Welded Joints: Types of riveted joints, Failure modes, strength equations, joint efficiency, Riveted joint for boiler shells... Welded joints, strength of parallel, transverse & combined filled welded joints... Threaded Joints: Types of screwed fastenings, Initial tightening loads in bolts, Torque requirement... Uniform strength bolt, Direct & eccentrically loaded bolted joints. Numerical Design Problems.
Power Screws: Types of threads of power screws - Square, trapezoidal & Acme threads, Torque requirement... efficiency, irreversibility & self-locking, Complete analysis of design of screw jack. Spur Gear: Classification of Gears, spur gear terminology, Gear tooth failure... Lewis equation for beam strength of tooth, dynamic and wear loads. Numerical Design Problems.