Basic introduction topics for EG

1. Introduction
Engineering Graphics

2. Graphics – “Language”

4. Engineering Graphics or Drawing

6. “Language”

7. Drawing Standards
• Engineering drawing - Universal Language of
Engineers.
• Every Language has its own rules of “Grammar”
• Engineering Graphics (Language)
– Grammar – types of lines and lettering
– Idioms – conventional practices
– Punctuations – dimensioning
– Abbreviations – symbols
– Script – Projections and constructions

8. Drawing Standards

9. Known standards
BIS – Bureau of Indian Standards
(Indian Standard)

10. BIS – Bureau of Indian Standards
(Indian Standard)

11. Drawing Instruments
• Drawing Board
• Drawing Sheets
• Mini – Drafter
• Instrument Box
• Protractor – cum – Pro circle
• Drawing pencils (HB, H and 2H)
• Adhesive tapes / clips

12. Drawing board
IS 1444 : 1989 , Standard size – 650 mm x 470 mm

13. Drawing Sheet
IS 10711 : 2001

14. Layout of a drawing sheet

15. Layout of a title block

16. Folding of drawing sheet

17. Mini – Drafter

18. Drawing Pencils
• Drawing pencils are more
important in Engineering
Drawing.
• HB is the medium soft
grades.
• H, 2H, 3H, et., denotes
degree of hardness in the
increasing order.
• B, 2B, etc., denotes degree
of softness in the increasing
order.
• Grades represents amount
of graphite mixed with clay.

19. Drawing Pencils

20. Lines (IS 10714:2001)

21. Lettering (IS 9609:2001)
• Lettering is defined as writing of titles, sub-
titles, symbols, dimensions etc., on a drawing.
• Lettering is freehand drawing and not writing
• Poor lettering will spoil the appearance of an
otherwise acceptable drawing.
• Lettering in drawing should be in CAPITALS
(i.e uppercase).
• Small letters – for abbreviations like mm, cm
,etc.,

22. Single stroke letters
• Single stroke – doesn’t
mean one stroke without
lifting the pencil, it means
uniform thickness in
stroke of the pencil.
• ALWAYS AVOID UPWARD
STROKE, AS IT WILL SPOIL
THE SHEET.
• Draw horizontal lines of a
letter from left to right &
vertical and inclined lines
from top to bottom as
shown in fig.

23. Letter types
• CAPITAL LETTERS (UPPER CASE)
• Small letters (Lower case)
• Standard height ‘h’ of the letter as per BIS are :
2.5, 3.5, 5, 7 and 10 mm.
• Draw thin guide lines (2H pencil with light
pressure) at a distance of height of letters ‘h’
apart.
• After lettering, don’t erase the guide lines.
• For lettering use HB pencil

24. lettering
Stem of lower case
Tail of lower case