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Egl lettering
- 1. Drawing Instruments • Drawingboard Drawing sheet Mini-drafter/drafting machine Instrument box containing compass, divider, etc. Protractor French curves Drawing pencils Eraser Drawing clip/pin/adhesive tape Sharpener • Manual & Drawing Kit from Balaji Store – VIT University.
- 2. Drawing board &Mini-drafter/drafting machine
- 3. Drawing sheet • Metric ISO“A” Series - Regular - Oversize ISO “B” Series • Non Metric
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- 5. Procedure for clampingthe drafter • Set the protractor head with reference mark indexing zero degree, then fix the clamp of the mini-drafter at the top left corner either along the top horizontal edge of the board or along the left vertical edge of the board. • With the drawing sheet placed underneath the scales of the minidrafter, fix the drawing sheet to the drawing board with the scales of the mini-drafter aligned either with the vertical or the horizontal borderlines of the drawing sheet.
- 6. Procedure for clampingthe drafter
- 7. Drawing Pencils • Woodenpencils – are graded and designated by numbers and letters • Mechanical clutch pencils (Micro Tip) – Not allowed • 6B, 5B, 4B, 3B, 2B, B - in decreasing order of softness and blackness • HB, F, H 2H, 3H – Medium grade • 4H, 5H, 6H, 7H, 8H, 9H – increasing order of hardness. • Drawings are done using 2H pencils and finished with H and HB pencils – to be practiced in this course. • Standard leads are 2 mm in diameter. • Fine line leads are available in .3, .5, .7 and .9 mm diameters
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- 9. Scale • Full Scale1 : 1 • Reduced Scale 1 : 100 1 mm of Drawing 100 mm of real • Enlarged scale 100 : 1 • 1:2, 5, 10, 20, 50, 100, 200, 500, 1000
- 10. Layout of DrawingSheets • Standard form of arrangement, Important particulars are included • Facilitate quick reading of important particulars – quick references are located easily – Drawings are prepared at various locations and shared
- 11. Title Block • Animportant feature – a must in every drawing sheet – for technical and administrative details • Location - Bottom right corner – 170 mm x 65 mm • Divided into two zones • Identification zone • Registration or identification number • Drawing title • Name of the legal owner of the drawing, i.e., name of the firm or the company • Additional information zone • Indicative items –symbol indicating the system of projection, main scale of drawing, etc. • Technical items – method of indicating surface texture, geometric tolerances, etc. • Administrative items
- 12. Lettering • Writing oftitles, sub-titles, dimensions, scale and other details on a drawing is called lettering. • It should be clear, legible and uniform • It should be simple, so it can be done with freehand with speed • Drawing instruments should not be used
- 13. Lettering • SINGLE STROKELETTERS • The thickness of the line is obtained by single stroke of the pencil • The lines of the inclined letter are drawn at an inclination of about 75° from horizontal. • The standard heights for lettering are 2.5, 3.5, 5, 7, 10, 14 and 20 mm. • The width of the letters is equal to the height in most cases. • Different for type A and type B lettering. • In lettering ‘A’ Type the height of the capital letter is directed into 14 parts.
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- 16. Lettering (Type-A) Note: The widthof letters are selected suitably and are varying from 0.4h to 0.6h expect for letters M,W and I The ratio of height to width for most of the CAPITAL letters is taken as nearly 14:10 and in case of M and W the ratio can be taken approximately as 14:12.For I the ratio as 14:6
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