engineering drawing - assignment

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ب ت ﮐﮐ ن رأ ت رو ج ري ف ج ه ي ق ل بMAKTAB KEJURUTERAAN JEFRI BOLKIAH KUALA BELAIT NEGARA BRUNEI DARUSSALAM ASSIGNMENT NO. ONE SESSION 2012/2013 Please Tick ( ) First Attempt: Re-Do: TITLE: ENGINEERING DRAWING FUNDAMENTALS, GEOMETRICAL CONSTRUCTION, ORTHOGRAPHIC & PICTORIAL PROJECTIONS AND PATTERN DEVELOPMENT UNIT TITLE: ENGINEERING DRAWING NAME/ID CARD NUMBER: MOHAMMAD ZULHAFIZZAN BIN ASMALI / 01-062499 GROUP/LEVEL: DIPLOMA YEAR 1 MARINE ENGINEERING (A) DATE GIVEN: FEBRUARY 2013 DATE SUBMITTED: MARCH 2013 Assessor: Signature: Date. FINAL MARK

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Engineering Drawing

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Page 1: Engineering Drawing - Assignment

بلقيه جفري کجروترأنمکتب

MAKTAB KEJURUTERAAN JEFRI BOLKIAHKUALA BELAIT

NEGARA BRUNEI DARUSSALAM

ASSIGNMENT NO. ONESESSION 2012/2013

Please Tick ( ) First Attempt: Re-Do:

TITLE: ENGINEERING DRAWING FUNDAMENTALS, GEOMETRICAL CONSTRUCTION, ORTHOGRAPHIC & PICTORIAL PROJECTIONS AND

PATTERN DEVELOPMENT

UNIT TITLE: ENGINEERING DRAWING NAME/ID CARD NUMBER: MOHAMMAD ZULHAFIZZAN BIN ASMALI / 01-062499

GROUP/LEVEL: DIPLOMA YEAR 1 MARINE ENGINEERING (A)

DATE GIVEN: FEBRUARY 2013 DATE SUBMITTED: MARCH 2013

Assessor:

Signature: Date.

Internal/External Verifier.

Signature: Date.

FINAL MARK

%

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TABLE OF CONTENT

JEFRI BOLKIAH COLLEGE OF ENGINEERING

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BDTVEC Diploma in Marine Engineering (2012/2013)

Introduction

Engineering drawings convey accurate information about shape in a way which words cannot. This language of lines, signs and symbols has to be learned before it can be expressed on paper. When it is being expressed, it has to be understood by others. But in order for it to work effectively, everyone concerned must interpret the drawings in the same way so that there is uniformity in its interpretation. So the British Standard Institution has prepared a booklet BS 308:1972 having all the standards and conventions to be used. This standard is now adopted for the preparation of drawings used in the engineering industry.

Basically, drawing is a principle means of communication in engineering. It is the method used to impact ideas and convey information and is often said to be the language of the engineer. It is an international language but it has its own rules and conventions.

The purposes of studying Engineering Drawing: Develop the ability to produce simple Engineering Drawing and sketches based on

current practice. Develop the skill to read manufacturing and construction drawing used in industry. Develop a working knowledge of the layout of plant and equipment. Develop skills in abstracting information from calculation sheets and schematic

diagrams to produce working drawings for manufacturers, installers and fabricators.

Drafting Equipment: The Drawing Board The Tee-Square The Set-Square 30-60 degree Triangle and 45 degree Triangle Protractor (Half Discs Protractor and Circular protractor) Drawing Instrument Set (Typical Drawing sets and Compass and Divider) Pencils (Drafting Pencil) Eraser/Rubber Drafting Tape

Task 1

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Describe the followings:

Engineering Drawing used as a mean of communication.

There are many different ways of communicating ideas, information, instruction etc. They can be transmitted by signs or gestures, by words of mouth, in writing or graphically. In an industrial context the graphical method is commonly used and communication being achieved by means of engineering drawings.

Engineering Drawing is a graphical language used by those concerned with the constructive arts e.g in the manufacturing of: Machinery, Structure, Ships, Aircraft and so on. If oral and writing communication only were used when dealing with technical matters, misunderstanding could arise, particularly in relation to shape and size. However, these interpretation difficulties had been eliminated by using graphical communication through engineering drawing.

For the communication to be effective, everyone concerned must interpret the drawings in the same way. Only then will the finished product be exactly as the designer wants it.

Orthographic Projection (compare between first and third angle projections).

In the engineering industry, communication between the drawing officer and the workshop is achieved mainly be means of engineering drawings. The principle method used to prepare these drawings is known as “Orthographic Projection”.

Orthographic projection is the representation of three-dimensional components on the flat surface (drawing sheet) in two-dimensional form. At least two orthographic views are required to indicate fully the shape and size of the component. If the component is a complicated one then more then two views are shown to aid understanding.

There are two type of Orthographic Projection used:1. First Angle Orthographic Projection – English Projection2. Third Angle Projection – American Projection

Comparation of First angle and Third angle projection

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I. First Angle Projections.

II. Third Angle Projections.

Types of Lines used in Engineering Drawing.

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One of the most important factors in good drawing is the quality of line work. It is essential that lines should be of uniformed thickness and blackness.

Type of Line Example Application

Continuous (thick) Visible outlines and edges.

Continuous (thin) Fictitious outlines and edges dimension and leader lines hatching outlines of adjacent parts outlines of revolved sections.

Continuous Irregular (thin) Limits of partial views or sections when the line is not an axis.

Short Dashes (thin) Hidden outlines and edges.

Chain (thin) Centre lines extreme positions of moveable parts.

Chain (thick at ends and at changes of direction, thin elsewhere)

Cutting planes.

Chain (thick) Indication of surfaces which have to meet special requirements.

Dimension (thin line) Arrow head must be sharp, black and fill in.

Pictorial Drawing.

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A component may be represented graphically in various ways. On the Pictorial Drawing, only one view is used to visualization the shape of a component. This type of projection not being use for communicating detailed instructions for manufacture.

A pictorial drawing is a quickly produced approximately scaled representation of a component. It is more like a picture rather than an accurately scaled line drawing.

There are many different types of pictorial representation. Two of the most commonly used are known as “Isometric Drawing” and ‘Oblique Drawing”.

i. Isometric Drawing.

ii. Oblique Drawing.

Task 2

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| Prepared By: Mohd Zuhafizzan Bin Asmalil