Engineering Drawing Notes
Projection is defined as the view of an object into a plane
called “projection Plane.”
Two Classification of Projection
1.
Parallel Line – plane drawing of an object.
2.
Perspective – multiple view drawing.
Parallel Line Drawing
1.
Orthographic Drawing – drawing of two
dimensional object (2D).
2.
Oblique Drawing
3.
Isometric Drawing – drawing with angles on both
sides.
4.
Section Drawing – allows to picture out the
inside feature of an object.
Equipment Used in Drawing
1.
Pencil – HB and 2H
2.
Eraser
3.
Ruler
4.
Triangular Scale
5.
T Square
6.
French Curve
7.
Erasing Shield
8.
Protractor
9.
Engineering Pen
10.
45 Degrees and 90/60 Degrees Triangles
11.
A3
Lines used in Drawing
Thin
Lines
|
Uses
|
Dimension
(Length)
|
Hidden Lines
|
Project inside lines
|
|
Phantom Lines
|
Show movement
|
|
Long break line
|
Short cut of drawing a long line
|
|
Dimension / Extension Line
|
For providing extension lines
|
|
Section Lines
|
To show inside features of a drawing
|
|
Center Line
|
To indicate the center of an object especially circular drawings
|
|
Stitch line
|
Used for stitches representation
|
|
Thick
Lines
|
Uses
|
Dimension
(Length)
|
Visible Lines
|
To show visibility of a line
|
|
Chain line
|
Representation of a chains
|
|
Short break lines
|
Narrowing the drawing of a line
|
|
Cutting / Viewing Plane
|
For viewing
|
Perspective Drawing Terms
1.
Station Point – it is the location of the
observer of an object to be projected.
2.
Horizontal Plane – it is the plane at an eye
level.
3.
Picture Plane – it is the plane perpendicular to
horizontal plane.
4.
Horizontal Ground Plane – it is the plane at the
lower portion of the horizontal plane.
5.
Horizon Line –the line of intersection of the
picture plane and the horizontal plane.
6.
Ground Line – the line of intersection f the
picture plane and the ground plane.
7.
Axis of View – it is a line view of a horizontal
plane. This is also known as the line of sight.
8.
Center of vision – piercing point of the Axis of
vision and the Picture Plane.
3 Principal Views
1.
Top View – horizontal plane
2.
Front View – Vertical
3.
Side View – profile plane
6 Principal Views – expansion of 3 principal views
1.
Top View
2.
Back view
3.
Front View
4.
Left Side View
5.
Right Side View
6.
Bottom View
The Auxiliary View – the view on which is not included in 6
principal views. It is a Slanting Plane.
Uses of Auxiliary View
1.
Find for a true length
2.
Find for a Point View
3.
Find for an Edge View
4.
Find for a True Size
5.
Find for a true angle
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