egl lettering
TRANSCRIPT
Drawing Instruments• Drawing board
Drawing sheetMini-drafter/drafting machineInstrument box containing compass, divider, etc.ProtractorFrench curvesDrawing pencilsEraserDrawing clip/pin/adhesive tapeSharpener
• Manual & Drawing Kit from Balaji Store – VIT University.
Drawing board & Mini-drafter/drafting machine
Drawing sheet• Metric
ISO “A” Series
- Regular
- Oversize
ISO “B” Series
• Non Metric
Mini-drafter/drafting machine
Procedure for clamping the 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.
Procedure for clamping the drafter
Drawing Pencils• Wooden pencils – 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
Eraser, Drawing clip
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
Layout of Drawing Sheets• 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
Title Block• An important 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
Lettering• Writing of titles, 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
Lettering• SINGLE STROKE LETTERS
• 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.
Lettering
Lettering (Type-A)
Lettering (Type-A)
Note:The width of 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
Lettering (Type-A)