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Title: Intro of engineering graphics
Description: Basically ,its an intro of engineering graphics,to clear all your basic terms.
Description: Basically ,its an intro of engineering graphics,to clear all your basic terms.
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Drawing:
•
•
The way of conveying the ideas through the systematic lines on the
paper
...
Classification:
1
...
e
...
paintings, cinema posters, advertisement boards, etc
...
Engineering Drawing (Instrument Drawing):
The art of representation of engineering objects
...
g
...
Types of Engineering Drawing:
i
...
g
...
a
...
e
...
square, triangle, etc
...
Solid Geometrical Drawing:
Three dimensional drawing having length, breadth and thickness
...
g
...
ii
...
g
...
iii
...
g
...
iv
...
g
...
Drawing Instruments and Other Drawing Materials:
1
...
Drawing Pencils – H, 2H, HB
3
...
Eraser (Rubber)
2
...
Set-squares – 45o and 30o – 60o
5
...
Small bow Compass
7
...
Small bow Divider
9
...
Protractor
11
...
Sand Paper
15
...
Cello Tape
17
...
Drafting Machine / Mini Drafter
19
...
Roller Scale
21
...
Sheet Folder
Mini drafter
Drawing
board
Drawing board and mini drafter
Drawing sheet holder
Roller Scale
20
Layout of Drawing Sheet
Title Block
30
20
All the dimensions are in millimeters
...
DATE:
LINES
10
10
SEM
...
:
SHEET NO
...
:
UPES DEHRADUN
CHECKED BY:
10
10
NAME:
10
Title Block (Sample)
50
50
NOTES:
All the dimensions are in millimeters
...
should be written by ink-pen
...
For pencil, the lines can be divided into two line-groups:
Line-group Thicknes
s
(mm)
0
...
1
Medium
Thin
Lines
Out lines, dotted lines, cutting plane lines
Centre lines, section lines, dimension lines,
extension lines, construction lines, leader lines,
short-break lines and long-break lines
...
Construction lines should be drawn very thin and faint
and should be hardly visible
...
Single-stroke Letters:
The thickness of the line of the letter is obtained in one stroke of the
pencil
...
I
...
It has two types:
i
...
Inclined (slope 75o with the horizontal)
•
The ratio of height to width varies but in most of the cases it is 6:5
...
•
Lettering is generally done in capital letters
...
• The letters should be so placed that they do not appear too close together
•
•
too much apart
...
Lettering, except the dimension figures, should be underlined to make
them more prominent
...
---------------3-5 mm
Drawing no
...
Gothic Letters:
Stems of single-stroke letters are given more thickness (vary from 1/5 to
1/10 of the height of the letters)
...
d
d/2
ABCDEFGHIJKLMN
OPQRSTUVWXYZ
1234567890
abcdefghijklmnopqrs
tuvwxyz
Dimensioning
The art of writing the various sizes or measurement on the finished drawing
of an object
...
Size or Functional Dimensions (S):
It indicates sizes
...
g
...
ii
...
S
S
L
L
L
Notations of Dimensioning
Note
Symbol
2 Holes, Ø12
Leader
(at 30o,45o,60o)
90
Dimension line
Arrow-head
Dimension figure
X
Extension line
3X
Arrow-head
1
...
2
...
3
...
Length : width ratio is 3:1
...
4
...
5
...
Terminated by arrow-head or dot
...
Symbol:
The representation of any object by some mark on the drawing
...
Units of Dimensioning
As for as possible all dimensions should be given in millimeters
omitting the abbreviation mm
...
But a foot note such as ‘All the dimensions are in centimeters’ is
inserted in a prominent place near the title box
...
g
...
50
0
...
)
15
...
75 ( Zero is omitted
Title: Intro of engineering graphics
Description: Basically ,its an intro of engineering graphics,to clear all your basic terms.
Description: Basically ,its an intro of engineering graphics,to clear all your basic terms.