Drawing lec 01 introduction 1

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  • Engineering DrawingBy: Engr. Rauf Ahmad

  • Chapter 1

    Introduction

    LEC 01, Introduction *

    LEC 01, Introduction

  • Contents

    LEC 01, Introduction *

    LEC 01, Introduction

  • The things you need

    LEC 01, Introduction *

    LEC 01, Introduction

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  • Items required for drawing Items required for drawingDrawing board (Available in Drawing Halls)Drawing sheet (Half Scholar Sheet)Mini-drafter/drafting machine/T- square(2ft or 3ft)Instrument box containing compass, divider, etc.Scales(6in. or 12in.)Set-Squares & Protractor(30cm)French curves(not required)Drawing pencils(A lots of them)Eraser(smooth)Drawing clip/pin/adhesive tapeSharpenerDuster

    LEC 01, Introduction *

    LEC 01, Introduction *

  • Standard sizes of drawing sheets as per BISA2 size

    LEC 01, Introduction *

    LEC 01, Introduction *

  • Instrument DrawingDrawing PencilsHigh-quality drawing pencils should be used in technical drawing, never ordinary writing pencils.Many makes of mechanical pencils are available together with refill leads in all grades. Choose a mechanical pencil that feels comfortable in your hand.

    LEC 01, Introduction *

    LEC 01, Introduction

  • Drawing Pencils

    Wooden pencils are graded and designated by numbers and lettersMechanical clutch pencils Not allowed 7B, 6B, 5B, 4B, 3B, 2B, B - in decreasing order of softness and blackness HB to F Medium grade H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H increasing order ofhardness.Drawings are done using 2H pencils and finished with Hand HB pencils to be practiced in this course.

    LEC 01, Introduction *

    LEC 01, Introduction *

  • Grades and designation of wooden pencils

    LEC 01, Introduction *

    LEC 01, Introduction *

  • Pencil drawing In finished drawing, all lines (except construction lines- used to construct the drawing) should be dense, clean and uniform. Construction line should be drawn very thin and should be hardly visible in the finished drawing ( they should not be erased).

    LEC 01, Introduction *

    LEC 01, Introduction *

  • Line types

    LEC 01, Introduction *

    LEC 01, Introduction *

  • Line types.CONTD

    LEC 01, Introduction *

    LEC 01, Introduction *

  • EngineeringDrawing

    The words of the language, as they are written or spoken, do not seem to play any role in my mechanism of thought. The psychical entities which seem to serve as elements in thought are certain signs and more or less clear images which can be voluntarily reproduced and combined--this combinatory play seems to be the essential feature in productive thought before there is any connection with logical construction in words or other kinds of signs which are communicated to others --Albert Einstein

  • 1. Try to write a description of this object.2. Test your written description by having someone attempt to make a sketch or visualize from your description.Effectiveness of Graphic LanguageThe word language is inadequate for describing the size, shape and features completely as well as concisely.You can easily understand that

    LEC 01, Introduction *

    LEC 01, Introduction

  • Graphic Language inEngineering Drawing

    LEC 01, Introduction *

    LEC 01, Introduction

  • A drawing can be created in 3 waysWays to Create anEngineering DrawingFreehand sketchUsing typical drawing instrumentsUsing a computer

    LEC 01, Introduction *

    LEC 01, Introduction

  • ExampleCreate a Drawing : Freehand sketchPictorial sketchOrthographic sketch

    LEC 01, Introduction *

    LEC 01, Introduction *

  • ExampleCreate a Drawing : Using instrumentsDrawing instruments are used to draw straight lines, circles, and curves concisely and accurately.

    LEC 01, Introduction *

    LEC 01, Introduction

  • ExampleCreate a Drawing : Using a computer2D drawingSolid modeling

    LEC 01, Introduction *

    LEC 01, Introduction

  • Elements of a DrawingA clear and precise engineering drawing requires both graphics and word languages.

    LEC 01, Introduction *

    LEC 01, Introduction

  • Text on drawings : Example

    Generalnotes

    Titleblock

    Dimensions&Notes

    LEC 01, Introduction *

    LEC 01, Introduction

  • Knowledge and Skills RequireGraphicslanguageWordlanguageVisualization is the ability to mentally picture things that do not exists.Engineering Drawing

    LEC 01, Introduction *

    LEC 01, Introduction

  • Drawing Standard

  • Definition and Necessity

    LEC 01, Introduction *

    LEC 01, Introduction

  • Standard Code

    LEC 01, Introduction *

    LEC 01, Introduction

  • Examples of TIS Standard. 210 2520 : . 440 .1 2541 1 . 446 .4 2532. 1473 2540 : http://library.tisi.go.th/data/lib_resources/pdf/catalog-online49/tis/02_ICS.pdf

    LEC 01, Introduction *

    LEC 01, Introduction

  • JIS Z 8311 Sizes and Format of DrawingsJIS Z 8312 Line ConventionsJIS Z 8313 LetteringJIS Z 8314 ScalesJIS Z 8315 Projection methodsJIS Z 8316 Presentation of Views and SectionsJIS Z 8317 DimensioningExamples of JIS Standard

    LEC 01, Introduction *

    LEC 01, Introduction

  • Drawing StandardDrawing Sheet

  • Drawing Sheet : Standard sizeTrimmed paper ofa size A0 ~ A4.

    Standard sheet size (JIS)

    A4 210 x 297A3 297 x 420A2 420 x 594A1 594 x 841A0 841 x 1189A4A3A2A1A0

    (Dimensions in millimeters)

    LEC 01, Introduction *

    LEC 01, Introduction

  • Drawing spaceDrawingspaceTitle blockBorder lines1. Type X (A0~A4)2. Type Y (A4 only)Title blockDrawing Sheet : Orientation & Margin

    LEC 01, Introduction *

    LEC 01, Introduction

  • Drawing StandardDrawing Scale

  • Drawing Scales : DefinitionDrawingActualLength, size12

    LEC 01, Introduction *

    LEC 01, Introduction

  • SCALE 1:1for full sizeSCALE X:1(X > 1) for an enlargement scalesSCALE 1:X(X > 1) for a reduction scalesDrawing Scales : Designation

    LEC 01, Introduction *

    LEC 01, Introduction

  • Drawing Scales : Notes

    LEC 01, Introduction *

    LEC 01, Introduction

  • Drawing Scales : Standard scale

    LEC 01, Introduction *

    LEC 01, Introduction

  • Drawing StandardLettering

  • - Size (or text height)- line thickness- Shape Space between letters Space between words

    Recommendation

    Legibility

    UniformityExamplesGOODNot uniform in style.Not uniform in height.Not uniformly vertical.Not uniform inthickness of stroke.Inappropriate spacebetween letters

    LEC 01, Introduction *

    LEC 01, Introduction

  • Style (this course)

    LEC 01, Introduction *

    LEC 01, Introduction

  • Basic StrokesStraightSlantedCurvedHorizontal1123I letterA letter123456B letter

    Examples

    LEC 01, Introduction *

    LEC 01, Introduction

  • Suggested Strokes SequenceStraight linelettersCurved lineletters&NumeralsUpper-case Letters & Numerals

    LEC 01, Introduction *

    LEC 01, Introduction

  • Lower-case Letters

    LEC 01, Introduction *

    LEC 01, Introduction

  • ILTFEHStroke Sequence : Upper-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • VXWStroke Sequence : Upper-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • NMKZYA4Stroke Sequence : Upper-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • OQCGStroke Sequence : Upper-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • DUPBRJStroke Sequence : Upper-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • 57Stroke Sequence : Upper-case12

    LEC 01, Introduction *

    LEC 01, Introduction

  • 6890S3Stroke Sequence : Upper-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • liStroke Sequence : Lower-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • vwxkzStroke Sequence : Lower-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • jyfrtStroke Sequence : Lower-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • coabdpqeStroke Sequence : Lower-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • gnmhusStroke Sequence : Lower-case

    LEC 01, Introduction *

    LEC 01, Introduction

  • DRAWINGWord CompositionNon-uniformspacingUniformspacing

    LEC 01, Introduction *

    LEC 01, Introduction

  • Word CompositionContourDRAWING

    Adjacent contour can be1. straight-straight : II, IN, IM, IP etc.2. straight-curve (or curve-straight) : IO, QR etc.3. straight-slant (or slant-straight) : IV, IW etc.4. curve-curve : OO, OG etc.5. slant-curve (or curve-slant) : VO, WG, VC etc.6. slant-slant : VW, VX etc.Spacing

    LEC 01, Introduction *

    LEC 01, Introduction

  • Leave the space between words equal to the spacerequires for writing a letter O.

    ExampleSentence CompositionALLDIMENSIONSAREINMILLIMETERSOOOOUNLESSOTHERWISESPECIFIED.O

    LEC 01, Introduction *

    LEC 01, Introduction

  • Drawing StandardLine Types

    Drawing standard

  • Basic Line Types &Name according to applicationContinuousDashChainStyleThicknessThickThin1. Dimension line2. Extension line3. Leader lineCenter lineHidden lineVisible linerepresent features that can be seen in the current view.represent features that can not be seen in the current view.represents symmetry, path of motion, centers of circles,axis of axisymmetrical partsindicate the sizes and location of features.1. Visible line3. Hidden line4. Center line2. Dimension line Extension line Leader line

    LEC 01, Introduction *

    LEC 01, Introduction

  • Example

    LEC 01, Introduction *

    LEC 01, Introduction

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