This document discusses the concepts and techniques for creating isometric drawings. Isometric drawings show a 3D object from 3 views - top, front, and side - with all lines drawn at a 30 degree angle from the horizontal. There are different methods for constructing isometric drawings depending on the shape of the object, such as the box method for rectangular objects or frame method for objects with vertices. Circles and curves can also be drawn in isometric views using techniques like locating the center of an ellipse or drawing along coordinates.

1. ISOMETRIC
DRAWING

2. CONCEPT OF ISOMETRIC DRAWING
 3 dimensional drawing (width, height and depth)
 Showing 3 views (top, front and side)
 Base line 30° from the horizontal plane
A
F
E
G
D
C
B
OBJEK A
A
B
C
D
E
F
G
OBJEK A
OBJEK A

3. ISOMETRIC AXIS
 Normal axis
 Horizontal axis
 Reversed axis

4. CHRACTERISTICS OF ISOMETRIC DRAWING
 Isometric lines –
parallel to isometric
axis
 Non-isometric lines-
lines that not parallel
to isometric axis

5. CHRACTERISTICS OF ISOMETRIC DRAWING
 Angle in isometric  Circle in isometric
 Curve in
isometric

6. VIEWING DIRECTION

7. CONSTRUCTION OF ISOMETRIC DRAWINGS
ON NORMAL AXIS
 Box method – using the entire object
dimensions (height, depth, width)

8. CONSTRUCTION OF ISOMETRIC DRAWING
ON NORMAL AXIS
 Frame method- object which has vertices such
as pyramids and cones

9. CONTRUCTION OF ISOMETRIC CIRCLE
USING FOUR CENTRE METHOD
 Locate the center of an
ellipse
 Construct an isometric
square
 Construct a
perpendicular bisector
from each tangent point
 Locate the four centres
 Draw the arcs with these
centers and tangent to
isometric square

10. CONSTRUCTING CURVES IN ISOMETRIC
PLANE USING COORDINATE METHOD