Bohol International Learning College
De La Paz, Cortes, Bohol
Name:
Subject: TLE Drafting/GMRC 9/10 Week: 3rd Quarter (Jan. 11 – 15,2021)
Module No.1 Teacher: Ms. Jodel Novie A. Lagare
Content Standard: demonstrates interpretation of working plan and sketches.
Performance Standard: Orthographic and pictorial drawings are interpreted
according to drawing standard.
Learning Competency: Identify assembly and detailed drawing.
Lesson 1
INTERPRET WORKING PLAN AND
SKETCHES
LEARNING OBJECTIVES
1. Identify the different types of pictorial drawing.
2. Differentiate the theories and principles of pictorial drawing.
3. Draw an orthographic view through third angle of projection.
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PICTORIAL DRAWING A pictorial drawing shows likeness (shape) of an object as viewed by the
observer. It represents a portion of the object and shows the method of its construction. In
some presentations, the whole object is shown in one view.
Types of Pictorial Drawing:
A. Axonometric Pictorial Drawing
1. Isometric drawing – a pictorial drawing showing the three surfaces of the object tilted 30
degrees in front of the observer.
Angle a = 300 , s = 30
Width: Scale 1:1
Height: Scale 1:1
Depth: Scale 1:1
Isometric drawing according to standard
2. Dimetric drawing – the angle that is used for the horizontal planes varies according to the
angle of view that has been chosen. This type is not widely used.
3. Trimetric drawing - a classification of an axonometric projection where in a cube is
positioned in the way that no axes and angles are equal when projected to the plane projection.
B. Oblique Pictorial Drawing
1. Cavalier drawing – an oblique drawing in which the depth axis lines are full scale or in full size.
2. Cabinet oblique – depth axis lines are drawn one-half scale.
3. General oblique – depth axis lines vary from one-half to full size.
C. Perspective Pictorial Drawing
1. 1-pt. or Parallel perspective – a perspective drawing using one vanishing point, the front view
is drawn in its true shape in full or scale size.
2. 2-pt. or Angular perspective – a perspective drawing using having two vanishing points.
3. 3-pt. or Oblique perspective – a perspective drawing using three vanishing points.
Instructions: Supply the needed information to complete the following statements.
1. A drawing showing more than one side of an object tilted in front of the observer.
a. pictorial drawing b. artistic drawing c. multi-view drawing d. orthographic drawing
2. The place or point where the observer is supposed to stand while viewing the object.
a. vanishing point b. center point c. piercing point d. station point
3. The point where the horizontal line in the perspective view seems to converge or meet.
a. station point b. vanishing point c. center point d. piercing point
4. The object is placed on the horizon at the eye-level of the observer.
a. bird’s eye view b. worm’s eye view c. man’s-eye view d. orthographic view
5. An oblique drawing in which the depth axis lines are in full size.
a. cabinet oblique b. cavalier oblique c. general oblique d. oblique perspective
6. Iso means equal, metric means _____________.
7. Circle becomes ellipse in ________________.
8. Lines that are not parallel to the three base lines in isometric are called ____________.
Isometric Drawing
Axes used in Isometric
Drawing
1. Vertical axis
2. Right-cross axis
3. Left-cross axis
Isometric drawing – a pictorial drawing showing the three surfaces of the object tilted 30 degrees in front of the
observer.
Isometric lines – are lines drawn parallel to the isometric axes.
Steps in Drawing Isometric from a given Orthographic Views
1. Study the given orthographic views carefully. Estimate the width, height and the depth of the object, then sketch the
axes used in isometric drawing.
2. Transfer the height (A), the width (B), and the depth (C) of the object to the corresponding
axis respectively.
3. Sketch isometric
lines to complete the isometric box.
4. Layout details of the object inside the box then finish the pictorial view by drawing the
object lines.
Directions: Below is a simple activity for you to work on. Sketch the isometric pictorial of the
given orthographic views. Practice the task following the given procedure.
Tools and materials:
Drawing paper or a long bond paper
Pencil
Eraser Equipment:
Drawing Table (Drafting Table or Drawing Board)
Procedure
1. Study the given orthographic views carefully. Estimate the width, height and the depth of
the object, then sketch the axes used in isometric drawing.
2. Transfer the height (A), the width (B), and the depth (C) of the object to the corresponding
axis respectively.
3. Sketch isometric lines to complete the isometric box.
4. Layout details of the object inside the box then finish the pictorial view by drawing the
object lines.
5. Double check your drawing then erase unnecessary lines.
