Isometric Notes

ISOMETRIC

DJJ 10013 ENGINEERING DRAWING

ISOMETRIC DRAWING, ALSO CALLED ISOMETRIC PROJECTION, METHOD OF
GRAPHIC REPRESENTATION OF THREE-DIMENSIONAL OBJECTS, USED BY

ENGINEERS, TECHNICAL ILLUSTRATORS, AND, OCCASIONALLY, ARCHITECTS.

STEPS FOR CONSTRUCTION OF ISOMETRIC

Step 1 : Step 4 :

Isometric sketches begin with defining isometric aves, Add details to the block starting from the front
three lines, one vertical and two drawn at 30 degree face. Then add details to the other faces.
from the horizontal.

Step 2 :

Three lines of the isometric axes represent the three
primary dimensions of the object : width, height and
depth.

Step 3 : Step 5 :

Draw the rest of isometric Dark all visible lines to complete
block. the isometric sketch. (Make
sure that construction lines are
light)

https://www.youtube.com/watch?v=ppqAgXK0RYs

DRAW ISOMETRIC VIEWS FOR THE ORTHOGRAPHIC
DIAGRAM BELOW.

https://www.youtube.com/watch?v=NEKJ9S28Fh8 https://www.youtube.com/watch?v=nDCg8LSODnU
https://www.youtube.com/watch?v=sSuyM60s7eA https://www.youtube.com/watch?v=9C3UF7g1F6A

DRAW ISOMETRIC VIEWS FOR THE ORTHOGRAPHIC
DIAGRAM BELOW

https://www.youtube.com/watch?v=iGkggrz3LFw https://www.youtube.com/watch?v=Hg16J_4tmPk
https://www.youtube.com/watch?v=kYqn4QhUqe4

DRAW ISOMETRIC VIEWS FOR THE ORTHOGRAPHIC
DIAGRAM BELOW

GEOMETRIC DIMENSIONING AND TOLERANCE

• WHAT IS DIMENSION IN TECHNICAL DRAWING?
• A DIMENSION IS A NUMERICAL VALUE EXPRESSED IN APPROPRIATE UNITS OF MEASUREMENT

AND USED TO DEFINE THE SIZE, LOCATION, ORIENTATION, FORM OR OTHER GEOMETRIC
CHARACTERISTICS OF A PART.
• WHAT ARE THE TYPES OF DIMENSIONING?
• THE BASIC TYPES OF DIMENSIONING ARE LINEAR, RADIAL, ANGULAR, ORDINATE, AND ARC
LENGTH. USE THE DIM COMMAND TO CREATE DIMENSIONS AUTOMATICALLY ACCORDING TO
THE OBJECT TYPE THAT YOU WANT TO DIMENSION.

EXAMPLE

DIMENSIONING SYMBOL ACCORDING TO TECHNICAL
DRAWING STANDARD

TOLERANCE

• WHAT IS TOLERANCE IN TECHNICAL
DRAWING?

• TOLERANCE IS THE TOTAL AMOUNT A
DIMENSION MAY VARY AND IS THE
DIFFERENCE BETWEEN THE MAXIMUM AND
MINIMUM LIMITS. TOLERANCE = 0.3 MM.

• TOLERANCES ARE REPRESENTED AS
TOLERANCE VALUES (A) OR AS DIRECT LIMITS
(B).

EXERCISE DIMENSION

Exercise A Answer A

There are 5 types of dimensioning mistakes. List them and then dimension the
object correctly.

EXERCISE DIMENSION

Exercise B Answer B

There are 5 types of dimensioning mistakes. List them and then dimension
the object correctly.