Engineering drawing

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Engineering DrawingP.D.Kahanadge

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Learning content, Introduction to Manufacturing Drawing Lettering and Dimensioning Conics (Parabola, Ellipse and Hyperbola) Loci (Cycloids, Trochoids, Spirals, Involutes, Helices) Lines and Planes (True lengths, Inclinations, Traces, Intersections) Auxiliary projection methods and Method of revolution Surfaces and Solids Interpenetration curves Developments Isometric Views Interpretation of Manufacturing Drawings Limits, Fits and Tolerances Surface Roughness and Machining Allowances Sectional Views Common methods of fastening Orthographic views of assembled machine components Drawing orthographic views from given exploded views Components given scattered to draw orthographic views of assembly with part list. Further examples in assembly drawings of machine components Introduction to computer aided drafting 3D modelling

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INTRODUCTION In this modern society, an engineer plays a vital role and he thinks of engineering solutions for problems in his mind and conveys them to others through the language of systematic lines. This language of systematic lines is called engineering drawing. Therefore, an engineer must have knowledge of this language to project his ideas correctly on the paper and then execute the job efficiently and effectively with the help of this drawing.

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Definition Simply drawing can be defined as the art of representation of an object by systematic lines and shapes on a paper. Drawing can be classified into two groups Artistic drawing (Free hand or Model drawing) Engineering drawing (Instrument drawing)

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Artistic drawing (Free hand or Model drawing) The art of representation of an object such as painting, cinema slide, advertisement boards, etc. by the artist by his imagination or by keeping the object before him is known as 'artistic drawing.

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Engineering drawing (Instrument drawing) The art of representation of engineering objects such as buildings, roads, machines, etc. on a paper is called engineering drawing.

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Engineering Drawing also classified as following 01) Geometrical drawing (i) Plane geometrical drawing (ii) Solid geometrical drawing 02) Mechanical engineering drawing 03) Civil engineering drawing 04) Electrical & Electronic engineering drawing, etc.

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Geometrical drawing The art of representation of geometrical objects such as rectangle, square, cube, cone, cylinder, sphere, etc. on a paper is called geometrical drawing   There are two sections of geometric drawing Plane geometrical drawing Solid geometrical drawing

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Plane geometrical drawing The art of representation of objects having two dimensions I.e. length and breadth such as square, rectangle, triangle, etc. on a paper is called plane geometrical drawing. Solid geometrical drawing The art of representation of objects having three dimensions i.e. length, breadth and thickness such as cube, prism, cylinder, sphere, etc. on a paper is called solid geometrical drawing. It is also called descriptive or practical solid geormetrical drawing.

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Mechanical engineering drawing The art of representation of mechanical engineering objects such as machines, machine parts, etc. on a paper is called mechanical engineering drawing

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Civil engineering drawing The art of representation of civil engineering objects such as roads, buildings, bridges, dams, etc. on a paper is called civil engineering drawing

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Electrical & Electronic engineering drawing The art of representation of electrical objects such as motors, generators, transformers, poles, towers, wiring diagrams, etc. on a paper is called electrical engineering drawing The art of representation of electronic circuits of TV, V.C.R, calculators, computers, etc. on a paper is called electronic engineering drawing.

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Drawing instruments and materials Drawing board T-Square Set-square (30-60 deg triangle, 45 deg triangle) Instrument box Scales Pencil and sand paper block Protractor Clinograph Eraser

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Drawing pins or Cello-tape Irregular or French curves Duster or handkerchief. Drawing ink Tracing paper and tracing cloth Drawing paper Sketch - book

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Drawing board A drawing board (also drawing table, drafting table or architect's table) is a kind of desk which can be used for any kind of drawing or writing on a large sheet of paper.

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The standard size of drawing boards according to Indian Standards Institution (I.S.I)

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Uses of Drawing board The flat surface of the drawing board is used to hold the drawing paper while the drawing is being made. The ebony strip of the board is used as a guide for the stock of the T-square

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T -square A T-square is a technical drawing instrument used by draft man primarily as a guide for drawing horizontal lines on a drafting table. It may also guide a triangle to draw vertical or diagonal lines.

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The standard size of drawing boards according to Indian Standards Institution (I.S.I)

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Uses of T-square The T-square is mainly used for drawing horizontal lines. T-square is used as a base for drawing various angles with the help of set squares.

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Set-squares A set square or triangle is an object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline

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Types of Set-squares: Thirty-sixty degree (30°-60°) Forty five degree (45°) The 30°-60° set-square has three edges, one of which forms 90° and other edges forming angles of 30° and 60° with the other sides respectively

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The 45° set-square is similar to the 30°-60° set-square, but its edges form an isosceles triangle in which two of the angles are of 45° each and other one's 90°

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Uses of set-squares The set-squares are used for drawing all straight lines except the horizontal lines which are usually drawn with T-square The perpendicular lines or the lines at 30°, 60° and 90° to the horizontal can be drawn by using the set-squares The perpendicular lines or the lines inclined at 45° and 90° to the horizontal can be drawn by using the set-squares By using two set-squares, angles of 15°, 75° and 105° can be drawn

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Instrument box Large size compass (150mm long) with inter- changeable pencil and pen legs Lengthening bar Large size divider (150mm long) Small bow compass (95 mm long) Small ink bow compass (95mm long) Small bow divider (95mm long) Pin point Ink point Ruling pen or liner Holder croquill Lead case

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Large size compass This compass is used for drawing circles and arcs of circles of required sizes.

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Last Updated: 8th March 2018

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