Engineering Drawing SImple Notes



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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