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NPTEL

Design of Precision Machines

NPTEL via Swayam

Overview

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ABOUT THE COURSE:The course gives an insight into the conceptual design of mechanisms used in products, machines, and devices used in various domains. The course aims to enable the student to recognize problem areas, generate design alternatives and make design choices to achieve precision and reliability, and avoid over-constraints in the design.The course contents include lectures & hands-on experience covering fundamental concepts in precision machine design; controlling Degrees-of-Freedom, exact-constrained design; design of elastic mechanisms/ flexures/ compliant mechanisms; friction, hysteresis and micro-slip; actuators and sensors for precision motion; slideways for long range precision motion, and dynamics of precision mechanisms. The course contents also include different case studies.INTENDED AUDIENCE: UGs and PGs from Mechanical, Materials, Aerospace, Automotive, Civil, and other related engineering branches. Working professionals associated with mechanical design of products, machines, etc.PREREQUISITES: UG courses in Engineering Mechanics, Kinematics and Dynamics of Machines, and Solid Mechanics

Syllabus

Week 1: INTRODUCTION TO PRECISION MACHINES

• Applications – Semiconductor equipment, precision machines, robotics, etc.
Week 2:FUNDAMENTAL CONCEPTS IN PRECISION DESIGN

• Design principles
• Definitions and terminology
Week 3:CONTROLLING DEGREES OF FREEDOM

• DOFs and Constraints
• Exact-constrained design
• Over-constraints
• Case-studies
Week 4:DESIGN FOR STIFFNESS

• Stiffness calculation
• Parallel v/s series
• Design using sheet metals
Week 5 & 6:FLEXURES

• Building blocks
• Cross flexures, flexure parallel guiding
• Sheet and wire flexure with reinforcement
• Folded sheet flexure, hole flexure
• Case studies
Week 7:FRICTION, HYSTERESIS AND MICROSLIP

• Virtual backlash, hysteresis
• Hysteresis in clamped joints
• Hysteresis-free connection
Week 8:NON-CONTACT BEARINGS

• Air bearings
• Flexure bearings
Week 9:SLIDEWAYS FOR LONG RANGE PRECISION MOTION

• Design using air bearings
• Air bearing stages
Week 10:ACTUATORS AND SENSORS

• Linear drives
• Sensors and encoders
Week 11:DYNAMICS OF PRECISION MECHANISMS

• Transient response – second order system
• Backlash induced dynamics
• Examples of avoiding backlash
Week 12:CASE-STUDIES

Taught by

Prof. Jitendra P. Khatait

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