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Isometric drawing overview, Study notes of Technical Drawing

Misamis University (MU)Technical Drawing

Isometric drawing overview for

Typology: Study notes

2022/2023

Uploaded on 03/08/2023

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LESSON 3 – ISOMETRIC DRAWING
Intended Outcome/Learning Objectives: In this lesson, you are expected to:
1. Realize the importance of isometric drawing
2. Acquire skills in the proper drawing of isometric
3. Draw pictorial (isometric) drawing of an object
Stimulating Learning (Motivation)
Pictorial drawings have many industrial uses. They are often included on engineering drawings
to clarify a detail. Sometimes, a section is shown pictorially. Maintenance manuals and parts manuals
rely heavily on pictorial drawings. Often an assembly is drawn in an exploded view. This shows the
relationships of the parts and their order of assembly.
Shaded pictorial drawings are used extensively in sales literature. Architectural perspectives
show the exteriors of buildings, the areas surrounding the building, and the interiors of rooms. Most
pictorial drawings are made by a special type of drafter, the technical illustrator. These individuals
have artistic ability and special preparation.
Inculcating Concepts (Input/Lesson Proper)
A. Pictorial Drawing
Pictorial drawing is a drawing that shows two or more faces/views of an object in just
one drawing. It is the oldest written method of communication known. A major value of
pictorial drawings is that they show objects three-dimensionally. Engineering drawings, with all
their dimensions and multiple views, are difficult to read for an untrained person. A pictorial
drawing, on the other hand, can be viewed and understood by individuals with no
background in engineering design.
So what are the types of pictorial drawing?
B. Types of Pictorial Drawing:
C. Isometric
The isometric pictorial drawing is the most commonly used type of axonometric
drawing. It is the easiest and most popular paralline drawing. All axis of the object are
simultaneously rotated away from the picture plane and kept at the same angle of the
projection of 30º from the picture plane.
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LESSON 3 – ISOMETRIC DRAWING

Intended Outcome/Learning Objectives: In this lesson, you are expected to:

  1. Realize the importance of isometric drawing
  2. Acquire skills in the proper drawing of isometric
  3. Draw pictorial (isometric) drawing of an object

Stimulating Learning (Motivation)

Pictorial drawings have many industrial uses. They are often included on engineering drawings to clarify a detail. Sometimes, a section is shown pictorially. Maintenance manuals and parts manuals rely heavily on pictorial drawings. Often an assembly is drawn in an exploded view. This shows the relationships of the parts and their order of assembly. Shaded pictorial drawings are used extensively in sales literature. Architectural perspectives show the exteriors of buildings, the areas surrounding the building, and the interiors of rooms. Most pictorial drawings are made by a special type of drafter, the technical illustrator. These individuals have artistic ability and special preparation.

Inculcating Concepts (Input/Lesson Proper)

A. Pictorial Drawing Pictorial drawing is a drawing that shows two or more faces/views of an object in just one drawing. It is the oldest written method of communication known. A major value of pictorial drawings is that they show objects three-dimensionally. Engineering drawings, with all their dimensions and multiple views, are difficult to read for an untrained person. A pictorial drawing, on the other hand, can be viewed and understood by individuals with no background in engineering design. So what are the types of pictorial drawing? B. Types of Pictorial Drawing: C. Isometric The isometric pictorial drawing is the most commonly used type of axonometric drawing. It is the easiest and most popular paralline drawing. All axis of the object are simultaneously rotated away from the picture plane and kept at the same angle of the projection of 30º from the picture plane.

30º 1 30º 1 1 ISOMETRIC (30º) An Isometric drawing is a pictorial representation of an object in which all three dimensions are drawn at full scale. The term isometric means “equal measurement”. Isometric steps Isometric drawing is the most commonly used method of pictorial drawing. Isometric drawings are built on three lines, called isometric axes. One is drawn vertically and the other two with the 30° set square either side of it. An Isometric drawing is a way of presenting designs in three dimensions (3D). They can be completed using the 30/60 set square or freehand. An Isometric drawing is one of a family of three-dimensional views called pictorial drawings. In an isometric drawing, the object’s vertical lines are drawn vertically, and the horizontal lines in the width and depth planes are shown at 30 degrees to the horizontal. The true dimension of the object is used to construct the drawing. These dimension can be taken from either drawings completed in orthographic or by measuring an object. Isometric drawings or images have become the industry standard for parts manuals, technical proposals, patent illustrations and maintenance publications due to their use of true length and the ability for untrained people to understand. An isometric projection results if the plane is oriented so that it makes equal angles with the three principal planes of the object. The representation of the object seen below is an isometric drawing of a cube. Isometric Cube In this drawing the three visible faces appear as equilateral parallelograms; that is, while all of the parallel edges of the cube are projected as parallel lines, the horizontal edges are drawn at an angle (usually 30°) from the normal horizontal axes, and the vertical edges, which are parallel to the principal axes, appear in their true proportions. Given Orthographic Views: