Download Anna University B-Tech ME 3rd Sem Computer Aided Machine Drawing CAMD Lab Manual Question Paper

DEPARTMENT OF

MECHANICAL ENGINEERING

ME8381 – COMPUTER AIDED MACHINE DRAWING LABORATORY

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III SEMESTER - R 2017

LABORATORY MANUAL

Name : ____________________________________

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Register No. : ____________________________________

Section : ____________________________________

VISION

College of Engineering is committed to provide highly disciplined, conscientious and

enterprising professionals conforming to global standards through value based quality education and training.

MISSION

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To provide competent technical manpower capable of meeting requirements of the industry

To contribute to the promotion of academic excellence in pursuit of technical education at different levels

To train the students to sell his brawn and brain to the highest bidder but to never put a price tag on heart and soul

DEPARTMENT OF MECHANICAL ENGINEERING

VISION

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Rendering the services to the global needs of engineering industries by educating students to become

professionally sound mechanical engineers of excellent caliber

MISSION

To produce mechanical engineering technocrats with a perfect knowledge intellectual and hands on

experience and to inculcate the spirit of moral values and ethics to serve the society

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PROGRAMME EDUCATIONAL OBJECTIVES (PEOS)

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1. Fundamentals

To impart students with fundamental knowledge in mathematics and basic sciences that will mould them to be

successful professionals

2. Core competence

To provide students with sound knowledge in engineering and experimental skills to identify complex software

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problems in industry and to develop a practical solution for them

3. Breadth

To provide relevant training and experience to bridge the gap between theory and practice which enable them to find

solutions for the real time problems in industry and organization and to design products requiring interdisciplinary skills

4. Professional skills

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To bestow students with adequate training and provide opportunities to work as team that will build up their

communication skills, individual, leadership and supportive qualities and to enable them to adapt and to work in ever

changing technologies

5. Life-long learning

To develop the ability of students to establish themselves as professionals in mechanical engineering and to create

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awareness about the need for lifelong learning and pursuing advanced degrees

PROGRAMME OUTCOMES (POS)

On completion of the B.E. (Mechanical) degree, the graduate will be able

1. To apply the basic knowledge of mathematics, science and engineering

2. To design and conduct experiments as well as to analyze and interpret data and apply the same in the

career or entrepreneurship

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3. To design and develop innovative and creative software applications

4. To understand a complex real world problem and develop an efficient practical solution

5. To create, select and apply appropriate techniques, resources, modern engineering and IT tools

6. To understand the role as a professional and give the best to the society

7. To develop a system that will meet expected needs within realistic constraints such as economical

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environmental, social, political, ethical, safety and sustainability

8. To communicate effectively and make others understand exactly what they are trying to tell in both verbal

and written forms

9. To work in a team as a team member or a leader and make unique contributions and work with coordination

10. To engage in lifelong learning and exhibit their technical skills

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11. To develop and manage projects in multidisciplinary environments

ME8381 - COMPUTER AIDED MACHINE DRAWING LABORATORY

SYLLABUS

COURSE OBJECTIVES

To make the students understand and interpret drawings of machine components

To prepare assembly drawings both manually and using standard CAD packages

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To familiarize the students with Indian standards on drawing practices and standard components

To gain practical experience in handling 2D drafting and 3D modelling software systems

List of Experiments

A. Drawing standards & fits and tolerances

Code of practice for Engineering drawing BIS specifications – welding symbols, riveted joints, keys, fasteners-

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reference to hand book for the selection of standard components like bolts, nuts, screws, keys etc, - limits, fits-

tolerancing of individual dimensions-specification of fits-preparation of production drawings and reading of part

and assembly drawings, basic principles of geometric dimensioning & tolerancing

B. Introduction to 2D drafting

Drawing, editing, dimensioning, layering, hatching, block, array, detailing, detailed drawing.

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Bearings- Bush bearing, plummer block

Valves-safety and non-return valves

C. 3D Geometric modelling and assembly

Sketcher-datum planes-protrusion-holes-part modelling-extrusion-revolve-sweep-loft-blend-fillet-pattern-chamfer-

round-mirror-section-assembly

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Couplings - Flange, Universal, Oldham's, Muff, Gear couplings

Joints – Knuckle, Gib & cotter, strap, sleeve & cotter joints

Engine parts – piston, connecting rod, cross-head (vertical and horizontal), stuffing box, multi-plate clutch

Miscellaneous machine components – screw jack, machine vice, tail stock, chuck, vane and gear pump

COURSE OUTCOMES

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Upon completion of this course, the students will be able to follow the drawing standards, fits and tolerances and

re-create part drawings, sectional views and assembly drawings as per standards

ME8381- COMPUTER AIDED MACHINE DRAWING LABORATORY

CONTENTS

Expt. No.01 STUDY OF DRAWING STANDARDS AND FITS AND TOLERANCES

Aim:

To study about the drawing standards and fits and tolerance

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1.1 Code of practice for Engineering Drawing

Abbrevations

Standard Codes

1.2 Welding symbols

Welding is a process of fastening the metal parts together permanently by the application of heat (fusion welds)

or pressure (pressure or forge welding) or both (resistance welding). Both ferrous (steel, cast iron) and Non-ferrous

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metals (like brass copper and alloy) can be joined by welding.

The various types of welding process are

a. Gas welding

b. Arc welding

Metal Arc Welding (MAW)

Gas metal Arc Welding (GMAW)

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Submerged Arc Welding (SAW)

Tungsten Inert Gas Welding (TIG)

Metal Inert Gas Welding (MIG)

c. Forge Welding

d. Resistance Welding

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e. Thermit Welding

f. High Energy Welding

A welding symbol may include the following elements:

1. Reference line

2. Arrow line

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3. Basic weld symbol

4. Dimensions & other data

5. Supplementary symbols

6. Finish symbols

7. Tail

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8. Specifications, process, or other references

tail field weld symbol weld-all-around symbol

weld info for otherside

weld info forarrow side

arrow to joint

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Finish Symbol

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Contour Symbol

Groove Angle; Included Angle Of

Countersink For Plug Welds

Root Opening; Depth Of Filling For

Plug & Slot Welds

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Groove Weld Size

Length Of Weld

Pitch (Center-To-Center

Spacing) Of Welds

Depth Of Bevel; Size Or

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Strength For Certain Welds

Field Weld Symbol

Specification

Process, Or Other

Reference

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Arrow Connecting

Reference Line To

Arrow Side Member

Of Joint

Tail (May Be

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Omitted When Reference

Is Not Used)

Weld All Around Symbol

Number Of Spot, Seam. Stud,

Plug, Slot, Or Projection Welds

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Reference Line

Weld Symbol

Elements In This Area Remain

As Shown When Tail

And Arrow Are Reversed

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Location Of Welding Symbol Elements

The position of the arrow line with respect to the weld is of no special significance. The side of the joint on which

the arrow line is drawn is called “arrow side”. The side of the joint remote to the arrow line is called “other side". The

reference line has significance on the weld side. If the weld symbol is placed BELOW the reference line, the welding

should be done in the “ARROW SIDE”. If the weld symbol is placed ABOVE the reference line, the welding should

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be done in the “OTHER SIDE”. If the weld symbol is placed both ABOVE and BELOW the reference line, the welding

should be done in both the "ARROW and OTHER SIDES".

Basic Weld Symbol

The basic symbols recommended by Bureau of Indian Standards (BIS) for specifies the type of weld are shown in

the fig.

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1.3 Riveted Joints

A riveted joint is a permanent type of fastener used to join the metal plates or rolled steel sections together.

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Riveted joints are extensively used in structural works such as bridges and roof trusses and in the construction of

pressure vessels such as storage tanks, boilers, etc. Although welded joints are best suited to several of these

applications than the riveted joints, however, riveted joints are ideal in cases where the joints will be subjected to

pronounced vibrating loads. Riveted joints are also used when a non-metallic plate and a metallic plate are to be

connected together. They are also used when the joints are not expected to be heated while joining as in welding,

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which may cause warping and tempering of the finished surfaces of the joints.

The disadvantage of riveted joints are: (i) more metal is removed while making of the holes, which weakens the

working cross sections along the line of the rivet holes, and (ii) weight of the rivets increases the weight of the

riveted members.

A rivet is a round rod made either from mild steel or non-ferrous materials such as, copper, aluminium, etc., with a

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head is, and formed at one end during its manufacture and its tail end being slightly tapered. The length of the

shank of the rivet must be sufficient enough to accommodate the connection plates and provide enough material for

forming a head at its shank end. In general, the shank of the rivet will be equal to sum of the thickness of the

connecting plates plus 1.5 to 1.7 times the diameter of the rivet. If,

L = length of the shank of the rivet

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d = diameter of rivet

t = thickness of each of the connecting plates

then, L = ?t + (1.5 to 1.7)d

Various types of rivet heads for the use in general engineering work and boiler work as recommended by the

Bureau of Indian Standards. The different proportions of these rivet heads are given in terms of the nominal

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diameter d of the rivet. The rivet head to be used for general purposes for diameter below 12 mm are specified in

the Indian Standard code IS:2155-1962 and for diameters between 12 and 48 mm are specified in the Indian

Standard code IS:1929-1961. The rivet heads to be used for boiler work are specified in the Indian Standard code

IS: 1928-1961. The rivet heads to be used for ship building are specified in the Indian Standard code IS: 4732-

1968.

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1.4 Screw Threads, Keys and Fasteners

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Screw Threads

A screw thread is a functional element used on bolt, stud, set screw, nut or any other threaded piece or

component. Screw thread is a helical groove on a cylinder surface (outer side or inner side). Its function is to

transform the input motion of rotation into output motion of translation.

If a cylindrical rod is rotated at a constant speed simultaneously if a pointed tool touching the rod moving parallel to

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the axis of the rod at constant speed, the cut made by tool on the rod will be continuous and of helical form. The

helical groove is called “thread” and the threaded rod is called a “screw”.

Threads are cut using a lathe. Small size thread is often cut by means of a tool called die. A small size hole is

threaded by means of a tool called a tap.

The principal uses of threads are,

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1. for fastening

2. for adjusting

3. for transmitting power

Terms and Nomenclature

1. Crest: It is the peak edge of a screw thread that connects the adjacent flanks at the top.

2. Root: It is the bottom edge of the thread that connects the adjacent flanks at the bottom.

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3. Flank or side: It is the straight portion of the surface, on either side of the screw thread.

4. Angle of the thread: It is the angle included between the sides of two adjacent threads measured on an axial

plane.

5. Depth of the thread: It is the distance between the crest and the root measured at Right angle to the axis. It is

equal to half the difference between the outer diameter and the core diameter.

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6. Major diameter or outside diameter: It is the diameter of the imaginary coaxial cylinder, which would bind the

crests of an external or internal thread.

7. Minor or core or root diameter: It is the diameter of the imaginary coaxial cylinder; this would bind the roots of an

external thread or of an internal thread.

8. Pitch diameter: It is the diameter of the imaginary coaxial cylinder that can be passed so as to cut the thread, that

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the width of the cut thread will be equal to the Width of the groove.

9. Pitch: It is the axial distance between a point on one thread and the corresponding Point on the next thread. It may

be indicated as the distance from crest or from root of two adjacent threads.

10. Lead: It is the distance measured parallel to the axis from a point on a thread to the corresponding point on the

same thread for one complete revolution. In other words, it is axial distance a screw advances in one revolution.

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11. External thread: It is the thread on the outside surface of a member such as bolt, studs or screw.

12. Internal thread: It is the thread on the inside surface of a member such as nut or threaded hole.

13. Right hand thread: Right hand thread if turned clockwise direction advances into a threaded hole. It abbreviated

as RH.

14. Left hand thread: Left hand thread if turned anticlock

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