### MACHINE DESIGN | , Engineering Mechanics | Strength of Materials | Theory of Machines | Machine drawing and Workshop Processes| DIPLOMA 5th and 6th Semester

MACHINE DESIGN

 Course Title: MACHINE DESIGN Scheme (L:T:P) : 4:0:0 Total Contact Hours: 52 Course Code: 15ME53T Type of Course: Lectures, Self Study & Quiz Credit :04 Core/ Elective: Core CIE- 25 Marks                                                                                                         SEE- 100 Marks

Prerequisites: Knowledge of Mathematics, Engineering Mechanics, Strength of Materials, Theory of Machines, Machine drawing and Workshop Processes

Course Objectives:

This course curriculum provides the knowledge of design process, as well as enables the student to design simple machine components used in small and medium scale industries.

COURSE OUTCOMES

On successful completion of the course, the students will be able to:

 Course Outcome CL Linked PO Teaching Hrs CO1 Understand the concept of design and behavior of material under varying load conditions, Use of design data books while designing machine components R 2 04 CO2 Design of bolts, nuts, and riveted joints subjected to direct stresses and analyze the type of stresses induced under different load conditions R/U/A/An 1,2 12 CO3 Design of machine elements subjected to direct and twisting moments and analyze the type of stresses induced under different load conditions U/A 1,2, 10 CO4 Design of machine element like Solid Muff Coupling- flange coupling subjected to direct and twisting moments and Knuckle joint-Cotter joint subjected to direct stress and analyze the various modes of failure(with numeric examples) A / An 1,2 14 CO5 Design procedure of machine elements subjected to twisting moment and analyze the type of stresses induced in them R/U/A 1,2 08 CO6 Know the Principles of design as per ergonomic, and Environmental considerations R/U 2 04 Total sessions 52

Legend: R; Remember, U: Understand A: Application

COURSE-PO ATTAINMENT MATRIX

COURSE CONTENT AND BLUE PRINT OF MARKS FOR SEE

 Unit No Unit Name Hour Questions to be set for SEE/MARKS Marks weightage weightage (%) R U A/An/Ev/cre 1 INTRODUCTION TO DESIGN 04 05 -- -- 05 6.89 2 DESIGN OF FASTENERS 12 05 05 30 40 20.68 3 DESIGN OF SHAFTS, KEYS 10 -- 05 15 20 17.27 4 DESIGN OF SIMPLE MACHINE PARTS 14 --- ---- 50 50 34.48 5 DESIGN OF SPRINGS 08 -- 05 15 20 13.79 6 ERGONOMICS & AESTHETIC CONSIDERATION IN DESIGN 04 05 05 -- 10 6.89 Total 52 15 20 110 145 100

Machine Design–Classification-General considerations-Load-stress-strain,-stress-strain diagram for mild steel- Bending and torsion stress equations - Factor of Safety and Factors governing selection of factor of Safety- Stress Concentration – Causes & Remedies- Designation of materials as per IS- using of design data book Concept of Theory of failure- types.

Stresses in Screwed fasteners- bolts of Uniform Strength- Design of Bolts - Design of studs

for cylinder cover-simple problems on design of bolts subjected to external force -Design of Riveted joints -classification- Important terms used in riveted joints-materials for rivets- Failures of riveted joints-Strength and efficiency of riveted joints-Simple problems on Single and Double riveted lap joint -Single and Double riveted Butt joint (with single and double strap)

 UNITIII: DESIGN OF SHAFTS, KEYS                                                          10Hrs

Types of Shafts- Shaft materials-Standard Sizes- Design of Shafts (Hollow and Solid) using strength and rigidity criteria-design for line shafts supported between bearings with one or two pulleys in between or one overhung pulley.

Keys-Types-Design of Sunk Keys, Effect of Keyways on strength of shaft-Simple problems (excluding keyways).

Design of Couplings – Solid Muff Coupling- Flange coupling (Protected and Unprotected

type) - Cotter Joint - Knuckle Joint

Spring – terminology, materials and specifications-Classification and Applications of

Springs- Stresses in springs, Wahl’s correction factor, Deflection of springs-Design of Helical compression springs subjected to uniform applied loads like I.C. engine valves, weighing balance, railway buffers and governor springs-Problems on helical compression springs only- Leaf springs – Construction and application

Ergonomics of Design-Man-Machine relationship-Equipments for control-Ergonomics

considerations in design of controls-Equipments for display-Ergonomics considerations in design of display.-Aesthetic considerations regarding shape, size, color (Morgan’s code).

®REFERENCES

 Sl.No. Title of Books Author Publication 1. A Text book of Machine Design R.S. Khurmi & J.K.Gupta S. Chand publication 2. Machine design S G Kulkarni McGraw Hill Education Publications 3 Introduction to Machine design V B Bhandari McGraw Hill Education Publications 4. Design Of Machine Elements Vol I, Vol II J.B.K. Das , P.L. Srinivas Murthy Sapna Publication 5 Machine Component Design William Orthwein Jaico publication 6 Design Data Hand Book for Mechanical Engineers K Mahadevan & K Balaveera Reddy CBS publications

LIST SOFTWARES/WEBSITES

3.   http://nptel.ac.in/courses/Webcourse-

4.   http://nptel.ac.in/courses/Webcourse-

5.   http://nptel.ac.in/courses/Webcourse-

6.   http://nptel.ac.in/courses/Webcourse-

SPECIAL INSTRUCTIONAL STRATEGIES

 UNIT NO UNIT NAME STARATEGIES 1 INTRODUCTION TO DESIGN Lectures, Discussions ,cooperative learning group    based    learning,    Think-Pair-share activities among group of students 2 DESIGN OF FASTENERS Lectures, discussions, cooperative learning group    based    learning,    Think-Pair-share activities among group of students 3 DESIGN OF SHAFTS, KEYS Lectures, cooperative learning group based learning, Think-Pair-share activities among group of students 4 DESIGN OF SIMPLE MACHINE PARTS Lectures, cooperative learning group based learning, Think-Pair-share activities among group of students Industrial visits, movies. 5 DESIGN OF SPRINGS Lectures, cooperative learning group based learning, Think-Pair-share activities among group of students Industrial visits, movies 6 ERGONOMICS & AESTHETIC CONSIDERATION IN DESIGN Discussions, real life industries situation, industrial visits

SUGGESTED LIST OF STUDENT ACTIVITYS

Note: the following activities or similar activities for assessing CIE (IA) for 5 marks (Any one)

å         Each student should do any one of the following type activity or similar activity related to the course and before take up, get it approved from concerned Teacher and HOD.

å         Each student should conduct different activity and no repeating should occur

 1 The students should identify at least five applications .He should select the materials for identified applications by using design data hand book. List the mechanical properties of material selected. 2 Observe the system where transmission of power takes place through shaft, Keys, coupling, pulley and belt drive. Get the required information regarding power transmitted (power output by motoror engine etc.). By selecting suitable materials, design the shaft, key and coupling. 3 Assignments on design of Helical Springs, Screwed joints, Riveted joints [one each] with free hand sketches. 4 The student should Download and present various presentations related to design of machine elements 5 The student should Download and present various presentations related to stresses in machine elements.

 6 The student should Download and present various presentations related to failure of machine elements.

Course Assessment and Evaluation Scheme:

 What To who m When/Where (Frequency in the course) Max Marks Evidence collected Course outcomes Direct Assessment CIE IA Three IA tests(Average of three tests will be computed) 20 Blue books 1,2,3,4,5,6 Student Activities 05 Activity sheets SEE End Exam End of the course 100 Answer scripts at BTE 1,2,3,4,5,6 Indirect Assessment Student Feedback on course Middle of the course Feedback forms 1,2,3 Delivery of course End of Course Survey End of the course Questionnaires 1,2,3,4,5,6 Effectiveness of Delivery of instructions & Assessment Methods

CIE- Continuous Internal Evaluation      SEE- Semester End Examination

Note: I.A. test shall be conducted for 20 marks. Average marks of three tests shall be rounded off to the next higher digit.

Note to IA verifier: The following documents to be verified by CIE verifier at the end of semester

1.       Blue books ( 20 marks)

2.       Student suggested activities report for 5 marks evaluated through appropriate rubrics.

3.       Student feedback on course regarding Effectiveness of Delivery of instructions & Assessment Methods

RUBRICS MODEL

 RUBRICS FOR ACTIVITY( 5 Marks) Dimension Unsatisfactory Developing Satisfactory Good Exemplary Student Score 1 2 3 4 5 Collection of data Does not collect any information relating to the topic Collects very limited information; some relate to the topic Collect much information; but very limited relate to the topic Collects some basic information; most refer to the topic Collects a great deal of information; all refer to the topic Ex: 4 Fulfill team’s roles & duties Does not perform any duties assigned to the team role Performs very little duties but unreliable. Performs very little duties Performs nearly all duties Performs all duties of assigned team roles 5 Shares work equally Always relies on others to do the work Rarely does the assigned work; often needs reminding Usually does the assigned work; rarely needs reminding Normally does the assigned work Always does the assigned work without having to be reminded. 3 Listen to other Team mates Is always talking; never allows anyone else to speak Usually does most of the talking; rarely allows others to speak Talks good; but never show interest in listening others Listens, but sometimes talk too much Listens and speaks a fair amount 2 Average / Total marks=(4+5+3+2)/4=14/4=3.5=4

Note: This is only an example. Appropriate rubrics/criteria may be devised by the concerned faculty (Course Coordinator) for assessing the given activity.

Note to IA verifier: The following documents to be verified by CIE verifier at the end of semester

4.       Blue books ( 20 marks)

5.       Student suggested activities report for 5 marks

6.       Student feedback on course regarding Effectiveness of Delivery of instructions & Assessment Method