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Course Objectives, ● To familiarize the language of graphics which is used to express ideas, convey, instructions while carrying out engineering jobs., ● To familiarize drafting and sketching skills, to know the applications of drawing, equipment’s, and get familiarize with Indian Standards related to engineering drawings, ● To apply skills to translate ideas into sketches and to draw and read various, engineering curves, projections and dimensioning styles., ● To apply basic skills to develop projection of points and lines., ● To familiarize the knowledge orthographic and sectional views of objects, ● To apply skills to visualize actual object or a part of it, on the basis of drawings., , ● To experiment with the simple commands used for construction of two-dimensional, plane figures in CADD
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Course Outcomes, CO1: Illustrate basic elements of Drawing (14) Understanding, , CO2: Construct Projections of points and lines (12) Applying, CO3: Build Orthographic projections and Sectional views of object (9) Applying, CO4: Develop Isometric Projections (8) Applying, , Series Test 2
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Course Outline
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Contd..
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Contd..
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Contd..
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Importance of engineering drawing, ■ Engineering drawings provide the complete information of a component on its, designing aspects., ■ This will be very useful for the engineers to understand the components properly., Drawing gives perfect design on paper with proper dimensions., ■ Engineers convey the ideas of any objects clearly and accurately in its simplest form., They represent all physical objects graphically., , Reference : google
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Introduction to the drawing instruments, , Reference: engineering graphics (ASAP)
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Contd.., ■ Mini drafter : Mini Drafter is a device used to draw parallel or inclined lines very, effectively with ease. This is mounted on the top left corner of the drawing board by, means of a clamping mechanism which is an integral part of the device, , Reference: engineering graphics (ASAP)
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Contd.., ■ Pencil, –, –, –, –, –, , –, –, –, –, –, , There are eighteen grades of pencils., They are graded and designated by letters and numbers as, 9H,8H,7H,6H,5H,4H,3H,2H,H,F,HB,B,2B,3B,4B, 5B,6B and 7B., 9H is the Hardest, 7B is softest, The HB pencil is a soft grade used for drawing thick lines, borderlines, lettering and, arrowheads., The H pencil is used to draw finishing lines, visible lines and hidden lines., The 2H pencil is a hard grade pencil used for drawing construction lines, dimension, lines, centre lines and section lines, The degree of hardness of a pencil is printed on the pencil. H stands for "hard". HB, stands for "hard black", which means "medium hard". F stands for "firm“, HB medium hardness-suitable for lettering and dimensioning, H soft pencil used to start the drawing and any correction can be done before, finishing. 2H to finish by darkening
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Contd.., ■ Drawing board
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Contd..
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Drawing scales, Scale is the ratio of the length of an object on the drawing to Its actual length., SCALE 1:1 for full size, , SCALE X:1 for enlargement scales (X > 1), SCALE 1:X for reduction scales (X > 1)
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Basic lines
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Contd.., , Reference : ASAP graphics
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Sample diagram
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Drawing sheet
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Title block
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Principle of dimesniosning, , Reference : ASAP graphics
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Contd.., ■ Each feature shall be dimensioned only once in a figure, ■ Dimension should be placed outside the figure
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Contd.., ■ Dimension should be from visible outline
