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Engineering Drawing Instruments and Their Usage, [PDF], , a& machanicalonotes.comitngineeting-diavang-insiruments!, , , , In this, paper,, lam, going, to, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , familiarize you with the Engineering Drawing Instrument. So let's dive into the article., , Engineering Drawing Plays a crucial role in the life of Every Mechanical Engineering, student because he has to bear that subject throughout his BTech. Apart from the, Engineering Drawing, Production Drawing and Machine Drawing was also need to be, leamed by the Engineering student., , In Engineering Drawing, we have to draw and understand the largest buildings on a, drawing sheet. not by reducing the dimensions but by reducing the scale. To measure any, component, we need a set of Drawing Instruments in Engineering Drawing which are, presented below., , Instruments Used In Engineering Drawing:, , , , The instruments used in engineering drawing are:, , 1. Drawing sheet, 2. Drawing board, 3. Mini drafter, , 4 Eraser, , 5. Pencils, , Ww
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6. Protractor, , 7. French curves, 8. Templates, , . Paper Holders, 10. Set squares, 11. Compass, , 12. Divider, , ©, , The Detailed explanation of above mentioned Drawing Instruments are shown below., , 1. Drawing Sheet:, , , , Drawing sheet is a white paper on which an object is drawn which is available in various, sizes as shown below., , Drawing Sheet Type Dimensions (Length X Width) (mm), , , , , , , , , , , , Ao 841 X 1189, Ay 594 X 841, A2 420 X 594, As 297 X 420, As 210 X 297, As 148 X 210, , 2. Drawing Board:, , , , Itis an object(table) on which the drawing sheet is placed. It is made up of wood and, available in the rectangular cross-section. The drawing sheet is placed on the drawing, board and is fixed by means of clips which are either plastic or metal materials., , The dimensions of the drawing board w.r.t length, width and thickness are presented, below., , Type of Drawing Board Length X Width X Thickness (mm), , , , , , Do 1500 X 1000 X 25, D, 1000 X 700 X 25, D, 700 X 500 X 15, , , , D; 500 X 350 X 15, , ayy
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3. Mini Drafter:, , , , It is used for drawing vertical lines, horizontal lines, inclined lines, parallel lines, angles., perpendicular lines, etc. Mini Drafter generally consists of two scales that are, perpendicular to each other and are calibrated in 'mm’. One end of the scale is to be, connected to the edge of the table and the other end is used to mark and measure the, dimensions., , ait
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5. Pencils:, , Pencils are the main drawing instruments used to draw the lines, circles, arcs, polygons,, etc. w.r.t. the scale provided. Some of the pencils are hard and some of the pencils are, smooth. The hard pencils are used to draw the construction lines and the smooth pencils, are used to draw the main lines, , Depending on the smooth and hard quality or the hardness, pencils are classified into 18, grades and they are as follows.
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Grade of Pencil Hardness of Pencil, , 9H Hardest, , 6H, 5H, 4H Extremely Hard, , 3H Very hard, , 2H Hard, , H Moderately hard, , F Firm, , HB Medium hard, , B Moderately soft and black, , 2B Soft and black, , 3B Very soft and black, , 4B, 5B, 6B Very soft and very black, , 7B Softest, Out of the above 18 grades of pencils, the following grades are used in engineering, drawings., , Grade of Pencil Used to Draw, , 3H Construction lines, , 2H Dimension lines, center lines, sectional lines, hidden lines, , H Object lines, lettering, , HB Dimensioning, boundary lines, , 6. Protractor:, , , , \\, 12, By Pbroks13, 1. Solid pigment core (typically, graphite, commonly called pencil lead). 2. Wood., 3. Painted body. 4. Ferrule. 5. Eraser., , , , sft
