unit i - introduction to eng drawing

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  • MENG 1008MENG 1008

    Engineering Drawing

  • MENG 1008Lecturer/Demonstrator Information

    MANUAL DRAWING:

    Divesh Sahatoo - MAIN LECTURER (drsahatoo@gmail.com)

    Stephenson Thomas DEPUTY LECTURER

    AUTOCAD:

    Stephenson Thomas MAIN LECTURER Stephenson Thomas MAIN LECTURER

    Neil Mahabir DEPUTY LECTURER

    DEMONSTRATORS:

    Marc-Anthony Richards

    George Sammy

    Arshad Mohammed

    Jacy Warrick

    Vishram Boodoo

  • MENG 1008Course Schedule

    WeekMonday Thursday

    5pm - 8pm 5pm - 7pm

    1 Sept 1st - Independence Day Holiday Sept 4th

    2 Sept 8th Sept 11th

    3 Sept 15th Sept 18th

    4 Sept 22nd Sept 25th Manual Drawing4 Sept 22nd Sept 25th Manual Drawing

    5 Sept 29th Oct 2nd

    6 Oct 6th Oct 9th AutoCAD

    7 Oct 13th Oct 16th

    8 Oct 20th Oct 23rd - Divali Day Holiday

    9Oct 27th - MANUAL DRAWING

    EXAMOct 30th

    5:00pm - 6:30pm 6:30pm - 8:00pm 5:00pm - 6:30pm 6:30pm - 8:00pm

    10 Nov 3rd Nov 3rd Nov 6th Nov 6th

    11 Nov 10th Nov 10th Nov 13th Nov 13th

    12 Nov 17th Nov 17th Nov 20th Nov 20th

    13 Nov 24th - EXAM Nov 24th - EXAM Nov 27th - EXAM Nov 27th - EXAM

  • MENG 1008

    UNIT I: INTRODUCTION TO ENGINEERING DRAWING

    Principles of Engineering Graphics and their Significance Drawing Instruments and their Use Conventions in Drawing Lettering Drawing Standards, Engineering Scales, Simple Geometries.

    UNIT II: DRAWING OF PROJECTIONS

    Principles of Orthographic Projections Conventions First and Third Angle Projections, Projections of Points and Lines inclined to both planes, True lengths.

    MANUAL DRAWING COMPONENTS

    UNIT V: ISOMETRIC PROJECTIONS

    Principles of Isometric Projection Isometric Scale Isometric Views Conventions Isometric Views of Lines, Plane Figures, Simple and Compound Solids Isometric Projection of objects having non- isometric lines. Isometric Projection of Spherical Parts.

    UNIT VI: CONVERSION OF ISOMETRIC AND ORTHOGRAPHIC VIEWS

    Conversion of orthographic views into isometric views and Conversion of Isometric Views to Orthographic Views

    inclined to both planes, True lengths.

    UNIT III: PROJECTIONS OF PLANES and SOLIDS

    Projections of regular Planes, auxiliary planes and Auxiliary projection inclined to both planes. Projections of Regular Solids inclined to both planes Auxiliary Views. Sections and Sectional views of Right Regular Solids Prism, Cylinder, Pyramid, Cone Auxiliary views.

    UNIT IV: DEVELOPMENT AND INTERPENETRATION OF SOLIDS

    Development of Surfaces of Right Regular Solids Prisms, Cylinder, Pyramid Cone and their parts. Interpenetration of Right Regular Solids Intersection of Cylinder Vs Cylinder, Cylinder Vs Prism, Cylinder Vs Cone.

    Conversion of Isometric Views to Orthographic Views

    UNIT VII: PLANE GEOMETRICAL DRAWING

    Geometrical Constructions and Curves Used in Engineering Practice - a) Conic Sections including the Rectangular Hyperbola General method only, b) Cycloid, Epicycloid and Hypocycloid, c) Involute, d) Helices; Freehand Sketching Techniques.

    UNIT VIII : PERSPECTIVE PROJECTIONS

    Perspective Views: Points, Lines, Plane Figures and Simple Solids, Vanishing Point Methods (General Method only).

  • MENG 1008

    Week 1

    Introduction to AutoCAD: What is AutoCAD?

    Drawing environments( Graphics area, menu browser button, command line, status bar, layout tabs)

    Starting a New Drawing (templates)

    Naming a drawing

    Drawing Units

    Drawing Limits

    Coordinate system (Rectangular and Polar)

    Direct Distance Entry

    Lines , rectangles, circles, arcs

    Layers

    AUTOCAD COMPONENTS

    Layers

    Osnap

    Editing features : erase , move, copy , offset, array , rotate, trim , extend, break, chamfer, fillet, mirror, polar tracking

    Week 2

    Dimensioning : Dimension elements, Types of dimensioning

    Texts: Single line and Multiline texts

    Polyline, pedit, ellipse, polygon , point

    Hatching

    Plotting: Paper Space and Model Space

    Week 3

    Review

  • MENG 1008

    Engineering drawing is its own language.

    Consists of symbols and conventions which allow those who understand it to document

    and communicate effectively regardless of what language they speak.

    Used to effectively plan.

    Engineering jobs/projects require proper planning to be safe and successful. Engineering

    WHY ENGINEERING DRAWING?

    drawing conventions allow projects to be documented and hence thoroughly reviewed

    before being executed.

    This course is intended to introduce students to the fundamental rules, conventions, and

    procedures used for creating and interpreting engineering drawings. Through the use of

    several worked examples and practice exercises, students will have the opportunity to

    develop their own engineering drawing skills using both manual techniques and computer

    aided design (CAD) software.

  • MENG 1008

    Several standards exist which outline the proper and accepted methods for creating,

    communicating and documenting drawings.

    A standard is something established for use as a rule or basis of comparison in measuring or

    judging capacity, quantity, content, extent, value, quality, etc.

    Drawing standard organizations:

    DRAWING STANDARDS

    Drawing standard organizations:

    ISO - International Standards Organization

    ANSI - American National Standards Institute

    TTBS - TTS Trinidad and Tobago Bureau of Standards

  • MENG 1008DRAWING STANDARDS

    STANDARD NUMBER STANDARD TITLETTBS/ISO 3040 2008 Technical Drawings Dimensioning and Tolerancing cones

    TTS/ISO 128-1 2008 Technical Drawings General Principles Part 1: Introduction and Index

    TTS/ISO 129-1 2008 Technical Drawings Indication of Dimensions and Tolerances Part 1 General Principles

    TTS/ISO 406 2008 Technical Drawings Tolerancing of Linear and Angular Dimensions

    TTS/ISO 5457 2008 Technical Product Documentation Sizes and Layout of Drawing Sheets

    TTS/ISO 7083 2008 Technical Drawings Symbols for Geometrical Tolerancing o Proportions and Dimensions

    TTS/ISO 6433 2008 Technical Drawings Item ReferencesTTS/ISO 6433 2008 Technical Drawings Item References

    TTS/ISO 5455 2008 Technical Drawings Items Scales

    TTS/ISO 10209-1 2008 Technical Product Documentation Vocabulary Part 1 Terms Relating to Technical Drawings:

    General and Types of Drawings

    TTS 31 85 401 1988 Technical Drawings Dimensioning General Principles, Definitions, Methods of Execution and

    Special Indications

    TTS 31 85 002-1 1988 Technical Drawings Lettering: Currently Used Characters

    ANSI Y14.1 1980 (R1987) Drawing Sheet Size and Format

    ANSI Y14.2M 1979 (R1987) Line Conventions and Lettering

    ANSI Y14.3 1975 (R1987) Multiview and Sectional View Drawings

    ANSI Y 14.5 M 1994 Dimensioning and Tolerancing

  • MENG 1008

    T square.

    30 and 45 set squares (large 360mm).

    Metric ruler.

    Large Protractor.

    Spring-bow compass.

    French curves.

    Circle template.

    DRAWING TOOLS

    Circle template.

    Paper A2 size (420mm x 594mm).

    Pencils: 2H: Used for drawing guidelines.

    2B: Used for bordering, darkening and writing.

  • MENG 1008

    Setting up your paper:

    Place the T-square firmly against the tables edge and on the drawing sheet.

    Adjust the top edge of the sheet to align with the drawing (top) edge of the T-square.

    Once aligned, tape down the bottom corners.

    Ensure that the paper is still aligned properly then tape the top edges.

    PREPARING TO DRAW

    SHEET

    DESK

  • MENG 1008

    Bordering:

    Before beginning to draw, your sheet should be bordered. All drawing is to take place within

    this border.

    Using your ruler or set square, measure and mark a distance of 10mm from each of the 4

    sides of the sheet.

    Using your T-Square and set squares draw light (2H) lines through these points which are

    parallel to the each immediate side of the sheet.

    PREPARING TO DRAW

    parallel to the each immediate side of the sheet.

    Once this is complete, darken the border using your 2B pencil.

  • MENG 1008

    Bordering:

    PREPARING TO DRAW

  • MENG 1008

    Title Block:

    PREPARING TO DRAW

    SHEET

  • MENG 1008

    Title Block:

    For course purposes:

    Name

    Student ID #

    Course

    Assignment #

    PREPARING TO DRAW

    NAME ID# ASSIGNMENT #

    UNIVERSITY OF THE WEST INDIES DATE

    PROJECTION

    15 mm

    150 mm

    Assignment #

    Date

    Scale

    Projection

    Units of measure

    Any other relevant information (e.g. page #)

    PROJECTION COURSE UNITS

    SCALE PAGE #

    5 mm

  • MENG 1008

    Lettering:

    Using 2B or HB pencil.

    PREPARING TO DRAW

  • MENG 1008

    Lettering:

    Using 2B or HB pencil. 5 mm height.

    PREPARING TO DRAW

  • MENG 1008

    Scales:

    Drawings are often done to scale meaning they are drawn with dimensions at a ratio relative to the actual

    object being drawn.

    The size of the drawing can be smaller than the actual object or larger than the actual object.

    E.g. If drawing is half the size of the actual object, scale is 1:2.

    If drawing is twice the size of the actual object, the scale if 2:1.

    Always dimension the object using the dimensions of the actual object.

    PREPARING TO DRAW

    100 mm

    100 mm

    SCAL