CNC LAB | DIPLOMA 5th and 6th Semester | mechanical engineering



 CNC LAB

 

Course Title:  CNC LAB

Scheme (L:T:P) : 0:2:4

Total Contact Hours: 78

Course Code:

15ME64P

Type of Course: Tutorial and practice

Credit :03

Core/ Elective:

Core(practice)

CIE:25 Marks                                                                                                                 SEE:50 Marks

Prerequisites: Learning concepts of Computer Integrated manufacturing

 

 Course Objectives:                                                                                                   

 

1.       By undergoing this lab the students will learn to use the CNC machines efficiently for manufacturing desired products and knowledge of programming and use of CNC tooling

 Course Out comes                                                                                                   

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

 

Course Outcome

CL

Linked

experiments

Linked PO

Teaching Hrs

CO1

Appreciate the importance of CNC

lathe and CNC Milling machines

U/A

1-10

2,3,4

18

 

CO2

Understand the codes (G-code and M- Code) used in CNC machines for

programming

 

U/A

 

1-10

 

2,3,4

15

 

 

 

 

CO3

Develop Programming skills and crate an component for required drawing, Simulate the prepared part programme using available simulation software’s. And Prepare the parts on CNC

 

 

U/A

 

 

1-10

 

 

2,3,4

 

 

27

Total sessions

78

Legend: U: Understand A: application

 

 COURSE-PO ATTAINMENT MATRIX                                                                                                   

 

 

Course

Programme Outcomes

1

2

3

4

5

6

7

8

9

10

CNC LAB

0

3

3

3

0

0

0

0

0

0

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.


 LIST OF GRADED PRACTICAL EXERCISES                                                                                                   

The practical/Graded exercises should be properly designed and implemented with an attempt to develop different types of learning out comes in affective domain and psychomotor domain, so that students are able to acquire the necessary skills. Following is the list of experiments to be carried out.

 

Exer cise No.

 

Practical/Exercise

Apprx. Hrs.

Required

PART A. CNC turning centre part programming

Students would:

a.  Sketch each part with dimensions.

b.  Prepare CNC part programme using G and M codes with ISO format.

C.Show various zeros and tool path on part sketch with color codes and dimensions.

d. Simulate the prepared part programme using available simulation software’s.

e. Prepare the parts on CNC

1

Develop a part program for step turning and simulate

06

2

Develop a part program for taper turning and simulate

06

3.

Develop a part program for circular interpolation and simulate

06

4

Develop a part program for multiple turning operation and simulate

06

5

Develop a part program for thread cutting, grooving and simulate

06

6

Develop a part program for internal drills, boring and simulate

06

PART- B. CNC machining centre part programming

Students would:

a.  Sketch each part with dimensions.

b.  Prepare CNC part programme using G and M codes with ISO format.

C. Show various zeros and tool path on part sketch with color codes and dimensions.

d. Simulate the prepared part programme using available simulation software’s.

e. Prepare the parts on CNC

7

Develop a part program for grooving and simulate on CNC Milling

09

8

Develop a part program for drilling (canned cycle) and simulate

09

9

Develop a part program for mirroring with subroutines and simulate

12

10

Develop a part program for rectangular and circular pocketing and simulate

12

 

TOTAL

78


 

® TEXT BOOKS & REFERENCE

 

S.

No

.

Title of Book

Author

Publication

 

1

 

CNC Machines.

 

Pabla B.S., Adithan M.

New Age International, New Delhi,2014(reprint).

2

CAD/CAM: computer aided

design and manufacturing.

Groover Mikell P,

Zimmered W Emory

Prentice Hall 2014.

 

3

Computer Numerical Control- Turning and Machining centers.

 

Quesada Robert

 

Prentice Hall 2014.

 

4

 

CAD/CAM.

 

Sareen Kuldeep

 

S.Chand 2012.

 

5

Introduction to NC/CNC Machines.

 

Vishal S.

S.K.Kataria & Sons.

2012.

 

6

 

Computer Aided Manufacturing.

Rao P N, Tiwari N K, Kundra T

 

Tata McGraw Hill 2014.

 SUGGESTED LEARNING RESOURCES                                                                                                   

å         http://www.nptel.ac.in

å         http://www.youtube.com/watch?v=M3eX2PKM1RI

å         http://www.youtube.com/watch?v=EHQ4QIDqENI&list=PLBkqkLQO2nAt5

å         http://www.youtube.com/watch?v=hJFLcvtiNQI

å         http://www.youtube.com/watch?v=BIM1AyxfYkw .

å         http://www.mtabindia.com

å         http://www.swansoftcncsimulator.com

 

 SUGGESTED LIST OF STUDENT ACTIVITES                                                                                                   

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

Visit nearby industry having CNC machines. List and state important features of them with detail specifications and name of manufacturers.

2

Download free simulation software’s available on website and practice for part programming

3

At least take two simple mechanical components likes step turned shaft, sleeve, muff

measure the dimensions, prepare the sketch and develop part program, then simulate


 

 Course Delivery:                                                                                                   

The course will be delivered through specific instructional strategies detailed as below

 

S.N.

Unit Name

Strategies

 

1

 

Introduction.

Videos, Presentations, Demonstration.

 

2

 

CNC Turning & Machining Centers..

Videos, Presentations, Industrial Visits, Demonstration,

 

3

 

CNC part programming.

Simulation software, actual practice on CNC machines,

Demonstration,

 

 Course Assessment and Evaluation Scheme:                                                                                                   

 

 

Method

 

What

 

To whom

When/Where (Frequency

in the course)

 

Max Marks

 

Evidence collected

 

Course outcomes

 

 

 

 

 

 

 

CIE

(Continuous Internal Evaluation)

 

 

Two Tests

 

 

 

 

 

(Average of

two tests to

10

Blue books

1,2,3

 

 

be computed)

 

 

 

IA

Tests

 

 

 

Students

Record Writing (Average

marks of each exercise to be

 

 

10

 

 

Record Book

 

 

1,2,3

 

 

computed)

 

 

 

 

 

Activity

05

Report

1,2,3

 

 

TOTAL

25

 

 

SEE

 

 

 

 

 

(Semester

End

End

Exam

 

End of the

course

50

Answer scripts

at BTE

1,2,3

Examination)

 

 

 

 

 

 

 

 

 

 

Student Feedback on course

 

Middle of the course

 

Feedback forms

1,2,3,

Delivery of course

 

 

 

 

 

1,2,3

 

 

 

 

Effectiveness

 

Students

 

 

of Delivery

End of Course

Survey

 

End of the

course

Questionnaires

of

instructions

 

 

 

 

&

 

 

 

 

Assessment

 

 

 

 

Methods

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 performed activity.

 

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 Method


  Scheme of Valuation for End Examination                                                                            

 

 

Serial no

 

Description

Marks

 

1

 Part A CNC Turning Writing

10

 

20

Execution

10

 

 

1

 Part B CNC Milling Writing

10

 

 

25

Execution

15

3

Viva

5

 

TOTAL

 

50

 

 

Text Box: EQUIPMENT LIST:	Quantity: 01 Each

 

Sr.

No.

Resource with brief specification

 

1

CNC Turning Centre (Tutor or Productive)-

Minimum diameter 25 mm, Length 120 mm with ATC. (Approximate)

 

2

CNC Machining Centre (Tutor or Productive)-

X axis travel - 225 mm, Y axis travel - 150 mm, Z axis travel - 115 mm, With ATC.(Approximate)

 

3

 

Simulation software likes: CNC Simulator Pro, Swansoft CNC, etc.

 

4

Latest version of CAD/CAM integration software like MASTER CAM, NX CAM


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