ENGINEERING DRAWING

• Engineering Drawing – Introduction

  • Introduction to Engineering Drawing and Drawing Instruments
  • Conventions
  • Viewing of engineering drawing sheets
  • Method of Folding of printed Drawing sheet as per BIS SP: 46-2003

• Drawing Instrument

  • Drawing board, T-square, Drafter (Drafting M/c), Set squares, Protector, Drawing Instrument Box (Compass, Dividers, Scale, Diagonal Scales etc.), pencils of different grades, Drawing pins/ Clips.

• Free hand drawing

  • Lines, polygons, ellipse etc.
  • Geometrical figures and blocks with dimension.
  • Transferring measurement from the given object to the free hand sketches.
  • Solid objects – Cube, Cuboids, Cone, Prism, Pyramid, Frustum of Cone with dimensions.
  • Free hand drawing of hand tools and measuring tools, simple fasteners (nuts, bolts, rivets etc.) trade related sketches

• Lines

  • Definition, types and applications in drawing as per BIS: 46-2003
  • Classification of lines (Hidden, centre, construction, extension, Dimension, Section)
  • Drawing lines of given length (Straight, curved).
  • Drawing of parallel lines, perpendicular line
  • Methods of Division of line segment

• Drawing of Geometrical figures:

  • Definition, nomenclature and practice of –
    • Angle: Measurement and its types, method of bisecting.
    •  Triangle: different types
    •  Rectangle, Square, Rhombus, Parallelogram.
    •  Circle and its elements
    •  Different polygon and their values of included angles. Inscribed and circumscribed polygons

• Lettering & Numbering

  • Single Stroke, Double Stroke, Inclined.

• Dimensioning and its Practice

  • Definition, types and methods of dimensioning (functional, non-functional and auxiliary)
  • Position of dimensioning (Unidirectional, Aligned)
  • Types of arrowhead
  • Leader line with text
  • Symbols preceding the value of dimension and dimensional tolerance.

• Sizes and layout of drawing sheets

  • Selection of sizes
  • Title Block, its position and content
  • Item Reference on Drawing Sheet (Item list)

• Method of presentation of Engineering Drawing

  • Pictorial View
  • Orthographic View
  • Isometric View

• Symbolic representation – different symbols used in the trades

  • Fastener (Rivets, Bolts and Nuts)
  • Bars and profile sections
  • Weld, Brazed and soldered joints
  • Electrical and electronics element
  • Piping joints and fitting

• Projections

  • Concept of axes plane and quadrant
  • Orthographic projections
  • Method of first angle and third angle projections (definition and difference)
  • Symbol of 1st angle and 3rd angle projection in 3rd angle.

• Orthographic projection from isometric projection

• Reading of fabrication drawing

• Construction of scales and diagonal scales

• Conic sections (Ellipse and Parabola)

• Sketches of nuts, bolt, screw thread, different types of locking devices e.g. Double nut, Castle nut, Pin, etc.

• Sketches of foundation

• Rivets and rivetted joints, welded joints

• Sketches of pipes and pipe joints

• Assembly view of

  • Vee blocks,
  • Bush & Bearing,
  • Different types of Coupling viz., Muff coupling, Half Lap Coupling, Flange coupling, etc.
  • Simple work holding device e.g. vice
  • Drawing details of two mating blocks and assembled view

• Sketch of shaft and pulley, belt, gear, gear drives