MECHANICAL MEASUREMENTS | Diploma



Board of Technical Examinations, Bangalore

 

Course Title: MECHANICAL MEASUREMENTS

Scheme (L:T:P) : 4:0:0

Total Contact Hours: 52

Course Code:

15ME33T

Type of Course: Lectures, Self Study & Quiz

 

Credit :04

Core/ Elective:

Core

CIE- 25 Marks                                                                                                         SEE- 100 Marks

Prerequisites: Knowledge of basic mathematics and Science. Basic Electrical and Electronics Engineering

 Course Objectives:                                                                                                    

1.            Understand the advances in technology, measurement techniques, types of instrumentation devices, innovations, refinements.

2.            To learn various flow measurement techniques.

 

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

 

NOTE: The theory should be taught in such a manner that students are able to acquire different learning out comes in cognitive, psychomotor and affective domain to demonstrate following course outcomes.

 Course Outcomes:

 

Course Outcome

CL

Linked PO

Teach ing Hrs

 

CO1

Know the terms of the measurements, and Understand the principle of operation of an instrument, Choose Suitable measuring instruments for a particular application and Apply

ethical principles while measuring dimensions

 

R/U/A

 

1,2,3,10

 

12

 

CO2

Appreciate Measurement of strain by using a basic  strain gauge and hence verify the stress induced and application of transducers in mechanical engineering applications for

sustainable development

 

R/U/A

 

1,2,3,10

 

10

 

Apply the principles of instrumentation for transducers &

 

1,2,3,6,

 

CO3

measurement  of  non  electrical  parameters  like   temperature,

pressure,   flow,    speed,    force    and    stress    in mechanical

R/U/A

 

10

15

 

engineering applications for sustainable development

 

 

 

CO4

Apply the principles of Miscellaneous measurements for humidity, density, level and blood pressure.

 

U/A

1,2,3,4,6,

 

10

06

CO5

Apply the  principles  of limits,  fits, tolerance and  Analyse the

process  alignment  testing of  machine tools for  manufacturing

 

R/U/A

1,2,3,4,6,

09

 

field.

 

10

 

 

 

Total sessions

52

R-Remember; U-Understanding; A-Application


COURSE-PO ATTAINMENT MATRIX

 

Course

Programme Outcomes

1

2

3

4

5

6

7

8

9

10

MECHANICAL MEASUREMENTS

3

3

3

1

-

2

-

-

-

3

 

Level 3- Highly Addressed, Level 2-Moderately Addressed, Level 1-Low Addressed.

Method is to relate the level of PO with the number of hours devoted to the COs which address the given PO. If >40% of classroom sessions addressing a particular PO, it is considered that PO is addressed at Level 3

If 25 to 40% of classroom sessions addressing a particular PO, it is considered that PO is addressed at Level 2 If 5 to 25% of classroom sessions addressing a particular PO, it is considered that PO is addressed at Level 1

If < 5% of classroom sessions addressing a particular PO, it is considered that PO is considered not-addressed.

 

COURSE CONTENT AND BLUE PRINT OF MARKS FOR SEE

 

Unit No

 

Unit Name

Hour

Questions to be set for SEE

Marks weightage

weightage (%)

R

U

A

 

 

1

Measuring instruments

12

10

10

10

30

21

 

2

Transducers and strain gauges

10

5

10

15

30

21

 

3

Measurement of force, torque, and pressure

06

05

05

10

20

14

 

4

Applied                       mechanical measurements

09

05

05

15

25

17

5

Miscellaneous measurements

06

--

5

10

15

10

 

 

6

Limits, Fits, Tolerance & Testing of Geometric Dimensions

 

09

5

10

10

25

17

 

Total

52

30

45

70

145

100

R-Remember; U-Understanding; A-Application


Text Box: UNITI: MEASURING INSTRUMENTS	12Hrs

 

Measurement-definition-methods of measurement-Significance-Terms applicable to measuring instruments: Precision and Accuracy, Sensitivity and Repeatability, Range, Threshold, Hysteresis, calibration -Errors in Measurements-Systematic and Random error. Measuring instruments- Factors in selecting the measuring instruments -Thread measurements:-Bench micrometer- Thread gauge micrometer- Angle measurements- Bevel protractor, Sine Bar, Gauges: plain plug gauge, snap gauge, ring gauge-.Surface finish- Measurement of surface finish by Talysurf surface roughness tester-Co-ordinating measuring machine.

Text Box: UNTII: TRANSDUCERS AND STRAIN GAUGES	10 Hrs

Transducers- concept-Characteristics, Transducers selection factors, classifications of

Transducer, actuating mechanisms. Voltage and current generating analog transducers- Types-Piezoelectric transducer. Strain Measurements: Strain gauge, Classification, Berry- type mechanical strain gauge, optical strain gauges, mounting of strain gauges, Strain gauge rosettes-two and three elements, Gauge factor

 

Text Box: UNITIII: MEASUREMENT OF FORCE, TORQUE, AND PRESSURE	06Hrs

 

Force measuring devices- Spring Balance, Proving ring, Strain guage type Load cell- Torque measuring devices- Prony brake, Hydraulic dynamometer-.pressure measuring devices- - Diaphragm type pressure gauge- Bourdon tube pressure gauge- Mcloed gauge, Construction, working and applications.

Text Box: UNIT IV: APPLIED MECHANICAL MEASUREMENTS	09Hrs

 

Speed measurement- Classification of tachometers. Working principle, construction, working of Revolution counters and Eddy current tachometers. Displacement measurement- Working principle, construction, working of Linear variable Differential transformers (LVDT)-Flow measurement- Working principle, construction, working of Rotometers-Temperature measurement. Principle, construction, working of Resistance thermometers and Optical Pyrometer, Thermocouples.

 

Text Box: UNIT V: MISCELLANEOUS MEASUREMENTS	06 Hrs

 

Humidity measurement–construction, working of hair hygrometer-Density measurement- Measurement of density using hydrometer, Liquid level measurement –-Measurement of liquid level by using sight glass, Float gauge-Biomedical measurement- construction, working of Sphygmo monometer

 

Text Box: UNITVI: LIMITS,FITS,TOLERENCE & TESTING OF GEOMETRIC DIMENSIONS
09 Hrs


Concepts- Interchangeability, Selective Assembly, Basic Definitions, Graphical illustration  of limits and Tolerances. Fit-Classification of fits. Systems of fits-Hole Basis System and Shaft Basis system, Systems of tolerancing-Unilateral System and Bilateral System, Machine tools alignment testing-Checking Parallelism, Straightness, runout, alignment testing of machine tool during erection as per IS standard procedure

®TEXT BOOKS

1. Mechanical Engineering Measurement - Thomas Beckwith, N.Lewis Buck, Roy Marangoni - Narosa Publishing House, Bombay

 

REFERENCES

1.          Mechanical Engineering Measurements - A. K. Sawhney - DhanpatRai& Sons, New Delhi.

2.            Metrology  & Measurement” by Anand K Bewoor,Vinay kulakarni ,Tata McGraw hill New delhi 2009

3.            “Principles of Engineering metrology” by Rega Rajendra Jaico publishers-2008

4.           “Dimensional Metrology “by Connie Dotson, DELMAR ,cenage learning,2007

5.           “Engineering Metrology” by R.K.Jain, Khanna Publishers, 1994

 

 LIST OF SOFTWARES/ LEARNING WEBSITES:                                                                                                     

 

1.           http://en.wikipedia.org/wiki/Metrology (metrology).

2.           https://www.youtube.com/watch?v=4hlNi0jdoeQ (vernier).

3.           https://www.youtube.com/watch?v=FNdkYIVJ3Vc(vernier).

4.           https://www.youtube.com/watch?v=O8vMFFYNIfo (micrometer)

5.           https://www.youtube.com/watch?v=h98HPVuWjLA (depth micrometer)

6.            https://www.youtube.com/watch?v=SmXfGan_NXQ (telescopic gauge)

7.           http://www.authorstream.com/Presentation/007sandeepks-1858141-angular- measurment/ (angular measurement).

8.           http://askguru.net/t-Angular-Measurement-ppt

9.            https://www.youtube.com/watch?v=aBzh6i5fQ70 (surface roughness)

10.        https://www.youtube.com/watch?v=S7SXD6sKQ-I(surface roughness)

11.         https://www.youtube.com/watch?v=eVpoJzLJa0U(surface roughness)

12.        https://www.youtube.com/watch?v=3Od7vnoMwGg(surface roughness)

13.        https://www.youtube.com/watch?v=XnLiTPGE6pk (three wire thread measurement)

14.         https://www.youtube.com/watch?v=Gdvtw0pTAOs (thread pitch).

15.        https://www.youtube.com/watch?v=qMgXGedDffw (dial indicator)

16.        http://www.authorstream.com/Presentation/donzvasanth-1501139-unit-2-linear- angular-measurement/

17.        http://en.wikipedia.org/wiki/List_of_gear_nomenclature#Addendum (gear nomenclature).


18.        https://www.google.co.in/search?q=gear+tooth+vernier+caliper&tbm=isch&tbo=u& source=univ&sa=X&ei=MIuEUsqSOsiKrQeywIFQ&ved=0CCgQsAQ&biw=1600& bih=804 (gear tooth vernier).

19.        http://www.youtube.com/watch?v=lc4dsNvm2Ks (principle of mech. meas).

20.        http://www.youtube.com/watch?v=nv3GuJArjNU (Transducers).

21.        http://www.youtube.com/watch?v=iMIzApq1CQ0 (pressure measurement).

22.        http://www.youtube.com/watch?v=JKuoQ5FV2c8 (temperature meas.).

23.        http://www.youtube.com/watch?v=GNOI_7ftbQ0(temperature meas.) .

24.         http://www.youtube.com/watch?v=7xUdPVpafyI (flow measurement).

25.        http://www.ignou.ac.in/upload/Unit-4-62.pdf (limit gauges).

26.        http://www.scribd.com/doc/55242715/8/Types-of-limit-gauges

27.        http://www.youtube.com/watch?v=v25PCV_IJCw (sensors)

28.         http://www.youtube.com/watch?v=QItuf6lNvmI(sensors)

29.        http://www.youtube.com/watch?v=pOvTyvBqzgM (displacement sensors)

30.        http://www.youtube.com/watch?v=inLkCOwVgyM (force sensors)

31.         http://www.youtube.com/watch?v=jxv0ITAr74A(force sensors)

32.         http://www.youtube.com/watch?v=0MP_9n08urA(force sensors)

33.        http://www.youtube.com/watch?v=zAddvPHfKnw(force sensors)

34.         http://www.youtube.com/watch?v=_fQSMVf3hdM (calibration).

35.         http://www.youtube.com/watch?v=HwSxBRaxn_4(calibration).

36.        http://www.youtube.com/watch?v=ZymDMUuVuyY (geometrical Tol.)

37.         http://www.gobookee.org/measurement-of-geometric-tolerances-in-manufacturing/

38.         http://www.me.metu.edu.tr/courses/me410/exp1/410exp1theory.pdf

39.         http://www.youtube.com/watch?v=5eaSkU6Ecik (flatness measurement)

40.        http://www.youtube.com/watch?v=1tBnpzyhVXU (measuring straightness)

 

41.         http://www.youtube.com/watch?v=1JNCe9fwRUw (measuring perpendicularity)

42.        http://www.youtube.com/watch?v=eJ8a0k8kQIE( Roundness and cylindricity)

 

 

Course Delivery:                                                                                                     

å         The course will be delivered through lectures and Power point presentations/ Video

å         Teachers can prepare or download ppt of different topic’s measuring instruments usage in mechanical engineering application, can prepare alternative slides.

SUGGESTED LIST OF STUDENT ACTIVITYS                                                                                                     

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

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

2.       Each student should conduct different activity and no repeating should occur

1

Each student will select and bring at least one mechanical component. Sketch each component.   Sketch and label main parts of instruments to be used.   Calculate least  count

of  the  instrument/s  to  be  used.  Measure  and  record  applicable  dimensions  of  each


 

component using suitable instrument

2

Sketch the part and setup, list the instruments used, list the steps followed and record the

observations for checking straightness

3

Select appropriate limit gauge for given dimension/part and check the dimension with

gauge.

 

 

å    MODEL OF RUBRICS /CRITERIA FOR ASSESSING STUDENT ACTIVITY           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.


Course Assessment and Evaluation Scheme:

 

 

What

To who

m

When/Where (Frequency

the course)

 

in

Max Mark

s

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

Student

Activities

05

activities sheets

SE

E

End

Exam

End

course

of

the

100

Answer scripts

at BTE

1,2,3,4,5

Indirect Assessment

Student Feedback on

course

 

 

 

Middle course

of

the

 

Feedback forms

1 & 2,3 Delivery of course

End Course Survey

of

End course

of

the

 

 

 

Questionnaires

1,2,3,4,5

Effectiveness of Delivery of instructions &

Assessment Methods

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

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


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