department of production engineeringhithaldia.ac.in/cm/pe/lab/07. me 494.pdf · aim: to study the...

DEPARTMENT OF PRODUCTION ENGINEERING HALDIA INSTITUTE OF TECHNOLOGY

LAB MANUAL ON

MACHINE DRAWING-II (ME 494)

CREDIT: 2

CONTACT HOURS / WEEK: 0-0-3

Syllabus

Machine Drawing-II (ME 494)

Assembly and detailed drawings of a mechanical assembly, such as

a simple gear box, flange coupling, welded bracket joined by stud

bolt on to a structure, etc.

Practicing AutoCAD or similar graphics software and making

orthographic and isometric projections of different components.

(At least six assignments must be conducted)

References:

1. Text Book on Engineering Drawing, Narayana and Kannaia H,

Scitech.

2. Mechanical Engineering Drawing and Design, S. Pal and M.

Bhattacharyya.

3. Machine Drawing by N.D. Bhatt.

4. Machine Drawing by P.S. Gill.

5. Engineering Drawing and Graphics + AutoCAD by K. Venugopal, New

Age International Pub.

6. Engineering Drawing with an Introduction to AutoCAD by D.A. Jolhe,

Tata-McGraw-Hill Co.

Course Outcome:

COS ME 494.

ME 494. 1

The incumbent will be able to acquire the knowledge/skill to read, demonstrate and interpret

mechanical assembly drawing in top down integrated manner, keeping in mind technical and

economical issues.

ME 494.. 2

The incumbent will be able to acquire the knowledge/skill to read, demonstrate and interpret

mechanical detailed drawing in bottom up integrated manner, keeping in mind technical and

economical issues.

ME 494. 3

The incumbent will be able to define, illustrate and discuss about machine drawing with bill of

materials, cost estimation and product life cycle, reliability adhering to the rules and

regulations of safety, social, legal aspects, and cultural issues applicable to professional

engineering practice.

ME 494. 4

The incumbent will be able to use different modern software lie AutoCAD, CATIA to improve the

accuracy and quality of the solutions and to reduce the time and effort.

ME 494. 5

The incumbent will be able to demonstrate and to interact effectively, via team-based laboratory

activities, on a social and interpersonal level with fellow students, and will demonstrate the ability

to divide up and share task responsibilities to complete assignments.

ME 494.. 6

The incumbent will be able to assembly and detailed drawings of a mechanical assembly, such

as simple gear box, flange coupling, welded bracket joined by stud bolt on to a structure, etc.,

etc. with an open mind for life-long learning and for the benefit of the organization as well as for

the self.

COS ME 494. PO1 PO2 PO3 PO4 PO5 PO6 PO7 PO8 PO9 PO10 PO11 PO12

ME 494 . 1

The incumbent will be able to acquire the knowledge/skill to read,

demonstrate and interpret mechanical assembly drawing in top

down integrated manner, keeping in mind technical and economical

issues.

3 3 3 3 3 3 - 1 1 1 1 1

ME 494. 2

The incumbent will be able to acquire the knowledge/skill to read,

demonstrate and interpret mechanical detailed drawing in bottom up

integrated manner, keeping in mind technical and economical

issues.

3 3 3 3 3 3 - 1 1 1 1 1

ME 494. 3

The incumbent will be able to define, illustrate and discuss about

machine drawing with bill of materials, cost estimation and product

life cycle, reliability adhering to the rules and regulations of safety,

social, legal aspects, and cultural issues applicable to professional

engineering practice.

3 3 3 3 3 3 - 1 1 1 1 1

ME 494. 4

The incumbent will be able to use different modern software lie

AutoCAD, CATIA to improve the accuracy and quality of the

solutions and to reduce the time and effort.

3 3 3 3 3 3 - 1 1 1 1 1

ME 494. 5

The incumbent will be able to demonstrate and to interact

effectively, via team-based laboratory activities, on a social and

interpersonal level with fellow students, and will demonstrate the

ability to divide up and share task responsibilities to complete

assignments.

3 3 3 3 3 3 - 1 1 1 1 1

ME 494. 6

The incumbent will be able to assembly and detailed drawings of a

mechanical assembly, such as simple gear box, flange coupling,

welded bracket joined by stud bolt on to a structure, etc., etc. with an

open mind for life-long learning and for the benefit of the

organization as well as for the self.

3 3 3 3 3 3 - 1 1 1 1 1

CO-PO Correlation:

* Enter correlation levels 1, 2 or 3 as defined below: 1: Slight (Low) 2: Moderate (Medium)3: Substantial (High) and It there is no correlation, put “-”

3.00 3.00 3.00 3.00 3.00 3.00 1.00 1.00 1.00 1.00 1.00 1.00

CO-PSO Correlation:

COS ME 494 PSO1 PSO2 PSO3

ME 494 1

The incumbent will be able to acquire the knowledge/skill to read, demonstrate and interpret mechanical

assembly drawing in top down integrated manner, keeping in mind technical and economical issues. 3 3 3

ME 494 2

The incumbent will be able to acquire the knowledge/skill to read, demonstrate and interpret mechanical

detailed drawing in bottom up integrated manner, keeping in mind technical and economical issues. 3 3 3

ME 494 3

The incumbent will be able to define, illustrate and discuss about machine drawing with bill of materials, cost

estimation and product life cycle, reliability adhering to the rules and regulations of safety, social, legal

aspects, and cultural issues applicable to professional engineering practice.

3 2 3

ME 494 4

The incumbent will be able to use different modern software lie AutoCAD, CATIA to improve the accuracy and

quality of the solutions and to reduce the time and effort. 3 3 3

ME 494 5

The incumbent will be able to demonstrate and to interact effectively, via team-based laboratory activities, on

a social and interpersonal level with fellow students, and will demonstrate the ability to divide up and share

task responsibilities to complete assignments.

3 2 3

ME 494 6

The incumbent will be able to assembly and detailed drawings of a mechanical assembly, such as simple

gear box, flange coupling, welded bracket joined by stud bolt on to a structure, etc., etc. with an open mind for

life-long learning and for the benefit of the organization as well as for the self.

3 3 2

* Enter correlation levels 1, 2 or 3 as defined below: 1: Slight (Low) 2: Moderate (Medium)3: Substantial (High) and It there is no correlation, put “-”

3.00 2.67 2.83

CO-

ASSIG

NMEN

T

CORR

ELATI

ON

MAP

COS ME 494. A-O1 A-O2 A-O3 A-O4 A-O5 A-O6

ME 494. 1

The incumbent will be able to demonstrate the knowledge/skill on the basics of limit, fit, tolerance and gauging. The incumbent will be able to draw the details drawing of a protected type of flange coupling.

ME 494. 2 The incumbent will be able to assembly of Plummer Block for supporting and joining two rotating shafts.

ME 494. 3

The incumbent will be able to generate different assembled views of Knuckle Joint placing the parts in proper positions.

ME 494. 4 The incumbent will be able to generate sectional view of assembled Screw Jack for lifting heavy load.

ME 494. 5 The incumbent will be able to generate sectional view of assembled view of Stuffing Box.

ME 494. 6 The incumbent will be able to draw of assembled view of a

tool head of shaping machine.

ASSIGNMENT NO-1:

Detailed drawing of protected type Flange Coupling

ASSIGNMENT NO-2:

Assembly drawing of Plummer block.

ASSIGNMENT NO-3:

Assembly drawing of Knuckle Joint.

ASSIGNMENT NO-4:

Assembly drawing of Screw Jack.

ASIGNMENT NO-5:

Assembly drawing Stuffing Box

ASSIGNMENT NO-6:

Assembly drawing of tool head of shaping machine.

Haldia Institute of Technology

Department of Production Engineering Sub: Machine Drawing-I (ME-494)

Pre-Requisite for Machine Drawing

(A) CODE OF PRACTICE FOR MACHINE DRAWING (Introductory Lesson)

Aim: To study the code for engineering drawing

Term Abbreviation

Across corners

A/C

Across flats A/ F

Approved APPD

Approximate APPROX

Assembly ASSY

Auxiliary AUX

Bearing BRG

Centimetre Cm

Centres CRS

Centre line CL

Centre to centre C/L

Chamfered CHMED

Checked CHD

Cheese head CH HD

Circular pitch CP

Circumference OCE

Continued CONTD

Counterbore C BORE

Countersunk CSK

Cylinder CYL

Diameter DIA

Diametral pitch DP

Dimension DIM

Drawing DRG

Equi-spaced EQUI-SP

External EXT

Figure FIG.

General GNL

Ground level GL

Ground GND

Hexagonal HEX

Inspection INSP

Inside diameter ID

Internal INT

Left hand LH

Machine M/C

Manufacture MFG

Material MATL

Maximum max.

Metre m

Mechanical MECH

Millimetre mm

Minimum min.

Nominal NOM

Not to scale NTS

Number No.

Opposite OPP

Outside diameter OD

Pitch circle PC

Pitch circle diameter PCD

Quantity QTY

Radius R

Radius in a note RAD

Reference REF

Required REQD

Right hand RH

Round RD

Screw SCR

Serial number Sl. No.

Sphere/Spherical SPHERE

Spot face SF

Square SQ

Standard STD

Symmetrical SYM

Thick THK

Thread THD

Through THRU

Tolerance TOL

Typical TYP

Undercut U/ C

Weight WT

(B) Standard Codes for machine drawing. ( Introductory lesson)

Aim: To get familiar with few standard codes.

STANDARD CODES

a. IS:9609-1983 --------Lettering on Technical Drawing.

b. IS:10711-1983-------Size of drawing sheets.

c. IS:10713-1983-------Scales for use on technical drawing.

d. IS:10714-1983-------General Principles of Presentation.

e. IS:10715-1983-------Presentation of threaded parts on technical drawing.

f. IS:10716-1983-------Rules for presentation of springs.

g. IS:10717-1983-------Conventional representation of gears on technical drawing.

h. IS:11663-1986-------Conventional representation of common features.

i. IS:11664-1986-------Folding of drawing prints.

j. IS:11665-1986-------Technical drawing – Title blocks.

k. IS:11669-1986-------General principles of dimension on technical drawing.

l. IS:11670-1986-------Abbreviations for use in Technical drawing.

(C) System of Limits, Fits, Tolerance and Gauging.

Aim: To understand the basics of limit, fit, and tolerance.

Understanding symbols of manufacturing drawing on limit, fit, tolerance.

Procedure:

Drawing of fundamental deviations.

Solving a problem on limit fit tolerance and showing it in enlarged scale.

Drawing of basic symbols of limit, fit, tolerance. I.e. straightness, flatness, roundness,

cylindricity, parallelism, squareness etc.

Outline of Basics of limit, fit, tolerance.

Limits & Fits: Why study Limits & Fits?

o Exact size is impossible to achieve.

o Establish boundaries within which deviation from perfect form is allowed but

still the design intent is fulfilled.

o Enable interchangeability of components during assembly

Definition of Limits:

The maximum and minimum permissible sizes within which the actual size of a

component lies are called Limits.

Tolerance:

It is impossible to make anything to an exact size, therefore it is essential to allow a

definite tolerance or permissible variation on every specified dimension.

Why Tolerances are specified?

Variations in properties of the material being machined introduce errors.

The production machines themselves may have some inherent inaccuracies.

It is impossible for an operator to make perfect settings. While setting up the tools

and workpiece on the machine, some errors are likely to creep in.

Compound Tolerances:

A compound tolerance is one which is derived by considering the effect of tolerances

on more than one dimension.

ISO Tolerances for Shaft Holes: The system lists a full range of 28 holes and 28 shafts. These ranges cover all sizes of

shafts and holes. Due to this, this system is more effective and useful than other

systems of fundamental tolerance. In numerical form, the tolerance size is defined by

its basic value followed by a symbol. The symbol is composed of a letter and a

number as well. A fit is designated by basic size which is common to both

component, i.e. shafts and holes. That basic size for fit is represented by a symbol

corresponding to each component, with the hole being placed first.

Fundamental Tolerance:

The tolerance unit is divided into two parts denoted by two symbols, which consist of

a letter symbol and a number symbol. This symbol is also known as the Grade.

Features of Letter Symbol:

The letter symbol denotes the deviation of actual size from the basic size. The

deviation designated by the letter is also known as fundamental deviation. The letter

symbol shows the closeness of the tolerance zone to the basic size.

Features of Number Symbol:

The number symbol represents the zone of tolerance with respect to the grade of

manufacture. This symbol is responsible for the grade of manufacture designed by

International Grade, IT, and the tolerance represented by the number symbol is known

as fundamental tolerance.

Calculation of Fundamental Tolerance:

In the way of calculation of fundamental tolerance and fundamental deviation, this

system specifies 13 main diameter systems and 22 intermediate steps. The entire

calculation is totally dependent upon the geometric mean D of the extreme diameter

of each step.

It provides 18 grades of tolerance IT01, IT0, IT1, IT2, IT3, to IT16. The value of

standard tolerance for grades 5 to 16 are determined from the tolerance unit ‘i’ and

formula is given.----- i= 0.433 √D + 0.001D mm,Where, D is in mm.

The standard tolerance corresponding to IT01, IT0 and IT1 are calculated by formula

given below-

IT01=0.3 + 0.008D, IT0 = 0.5 + 0.0012D and IT1 = 0.8 + 0.20D

The value of IT2, IT4 are determined between IT1 and IT5 values, geometrically.

Concept of Fundamental Deviation : The symbols of fundamental deviation for

holes are A, B, C, D, E, F, G, H, JS,J, K , L, M, N, P, R, S, T, U, V, X, Y, Z, ZA, ZB,

ZC. The rest of the letters, i.e. I, L , O, Q, and W, are not used. For shafts the same

symbols are used but in lower-case letters.

Fundamental deviation for holes : For holes of symbol among A to H, the lower

deviation is above zero line, with lower deviation for hole H being zero. For holes

having symbol among J to ZC, it is below zero line. In simple words, we can say that

the lower deviation for holes A to H is the fundamental deviation and for holes J to

ZC the fundamental deviation is the upper deviation.

Fundamental deviation for shafts : For shafts, the concept of fundamental deviation

is opposite to holes. For shafts a to h, the upper deviation is below zero line and

having the upper deviation being zero for shaft h. For, shafts having symbol in

between j and zc, it is above zero line, i.e. the fundamental deviation for shafts a to h

is the upper deviation and for shafts j to zc, it is lower deviation.

Let me show you a few examples of these symbols: 50H8/g7 or 50H8-g7, 40H7-g6

In these examples, 50 and 40 are the basic sizes. The symbol represents the

fundamental deviation for holes and small letter ‘g’ represents the fundamental

deviation for shaft. The numeric symbols represent the fundamental tolerance. You

can get the table of ISO tolerance on the web as well as in the market and in some

books, too. You just find the values of fundamental deviation and fundamental

tolerance using those tables according to the symbol given. Now, we can easily

calculate the actual size of shaft and hole only by small addition and subtraction.

There are a number of combinations of shafts and holes that may be used for a fit. It is

better to select hole basis fit. Because it is better as the production of shafts to the

required size is easier. But, the shaft basis system is very good for manufacturing

bright drawn bars.

Exercise:

1. Draw the chart of fundamental deviations(letter specification).

2. Calculate the limits of tolerance and allowance for a 25 mm shaft and hole pair

designated by H8d9. Take the fundamental deviation for ‘d’ shaft is -16D0.44.

3. Draw the Tolerance Symbols given below:



Assignment No: ME 494/01

Detailed drawing of a protected type flange coupling

Draw the detailed drawing of flanges, boss, keys of a protected type flange coupling

from the given assembled drawing.

Answer to the following questions

1. What is the function of a coupling?

2. State disadvantages of flange coupling. State possible solutions of overcoming the

disadvantages.

3. State about aligning of shafts while mounting a coupling.




Assembly of Plummer Block

The figure gives the part drawings of Plummer Block. Assemble all the parts and

draw the following assembled views.

i. Half Sectional front view ii. Top view. iii. End view

Answer to the following questions:

1. What are the advantages of Plummer Block over simple bush bearing?

2. State the different parts of Plummer Block with specific functions.

3. State the functions of Plummer Block.




Assembly of Knuckle Joint

Draw the orthographic projection of assembled knuckle joint whose parts drawing is shown below.


1. State the different parts of knuckle joint. 2. Which parts of knuckle joint can fail by shearing? 3. Which parts can fail by crushing? 4. State one practical instance where knuckle joint is used. State the

advantages.




Assembly of Screw Jack

Detail drawing of a Screw Jack is given in the following figure. Draw the half sectional front

view of the assemble drawing of the Screw Jack according to the given dimensions.

Answer to the following questions: 1. Explain the working principle of screw jack.

2. What is ‘self locking’ in respect of efficiency of screw jack?




Assembled Drawing of a Stuffing Box

Details of a stuffing box are given in the figure. Draw the following views of the stuffing box with all parts assembled together and sowing the piston rod in position.

(i) Sectional Front View (ii) Top View (iii) Side View

The particulars of the parts are shown in Table.

5. Stud and nuts 3 C-30 Equally spaced at 1200 4. Neck bush 1 Brass

3. Stuffing box 1 C.I. 2. Gland bush 1 Brass 1. Gland 1 CI

No. Name of parts No. off Material Remark


1. What is the function of a stuffing box 2. Mention the different parts of the stuffing box




Assembly of Tool Head of Shaping Machine Details of Tool Head of Shaping Machine are given. Draw the full sectional front view of the assemble drawing of the same according to given dimensions in first angle projection method.


1. State the working principle of a shaper machine. 2. Define mechanism, machine and machine tool. 3. Explain quick return mechanism. 4. What is Paul-Rachet mechanism?

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