Technical Drafting - G7-8-W6-LAS-Interpret Technical Drawings in Plans
Technical Drafting - G7-8-W6-LAS-Interpret Technical Drawings in Plans
Technical Drafting - G7-8-W6-LAS-Interpret Technical Drawings in Plans
Any Quarter-Week 6
Interpret Technical
Drawings and Plans
Prepared by
ALEX B. SILDON
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Republic of the Philippines
DEPARTMENT OF EDUCATION
Cordillera Administrative Region
SCHOOLS DIVISION OF MOUNTAIN PROVINCE
Bontoc, Mountain Province
Published by:
Learning Resource Management and Development System
COPYRIGHT NOTICE
2021
“No copyright shall subsist in any work of the Government of the Philippines. However,
prior approval of the government agency of office wherein the work is created shall be
necessary for exploitation of such work for profit.”
This material has been developed for the implementation of K-12 Curriculum through
the Curriculum Implementation Division (CID)—Learning Resource Management and
Development System (LRMDS). It can be reproduced for educational purposes and
the source must be acknowledged. Derivatives of the work including creating an edited
version, an enhancement or a supplementary work are permitted provided all original
work is acknowledged and the copyright is attributed. No work may be derived from
this material for commercial purposes and profit.
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PREFACE
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ACKNOWLEDGEMENT
The developer wishes to express his earnest gratitude to those who helped in the
development of this learning material. The fulfillment of this learning material would not
be developed without the people who gave their support, helping hand and cooperation:
To Besao National High School family, for their support, encouragement, and
patience in going over this learning material.
To the evaluators and the Division LRMDS staff for their comments and
suggestions which led to the improvement of this learning material and those names not
mentioned, but contributed in the completion of this instructional material, we thank you.
Above all, thanks to the Lord Almighty for the health, wisdom, guidance and
blessings He had given.
ABS
DIVISION EVALUATOR
CONSULTANTS
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TABLE OF CONTENTS
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Analyze Signs, Symbols and Data
Learning Activity Sheet in Technical Drafting 7/8
Any Quarter-Week 5
Learning Activity Sheet in TLE 7/8 – Any Quarter Week 6
Name: _________________________________
Grade level: ____________________________
Date: _________________________________
I. Learning Competency
II. Objectives
ORTHOGRAPHIC PROJECTION
This is a projection with all the views arranged at right angles to each other. It
completely describes the given object in size and design. It is generally used as the
basis for all working drawings.
We have previously stated that in order to construct an object, or project, it has
to be planned and drawn accurately. This can be done in multiple views where the
drawing shows the top, front and side views of the object at a certain angle.
In this kind of drawing, an object is drawn according to how to we see it, such
that, viewed in front, we can see the width and height; on the top, length and the depth
or width; on the side, its height, width and thickness. If the three views of an object
could be drawn, we would get the exact information needed to form or construct an
object.
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The following figures will show how an orthographic projection is drawn.
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5. The HEIGHT and WIDTH of the object must be seen on the front view; the
WIDTH and LENGTH on the top view; and the HEIGHT, WIDTH and
THICKNESS on the side view.
6. The whole drawing or projection must be on the left and the assembly drawing
(isometric or oblique drawing of the object) must be on the right.
7. A space of from 12 – 25 mm (3/4” – 1”) must be given for each view.
Procedure:
• Place the object in a glass box
• Freeze the view from each direction (each of the six sides of the box) and unfold
the box
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DIMENSIONING
Dimension is the measurement of the size, or the description of the size of the
given model. Its purpose is to give the exact proportion of the parts and their respective
relations.
PURPOSE OF DIMENSIONING
1. A dimension shows the actual size of the object quickly. Scaling or the actual
measurement is not needed to discover the exact sizes of parts when a set of
dimensions is already indicated.
2. It eliminates minor errors that are often made and that which cannot be avoided
in scaling.
3. It is adaptable. Unscaled drawings can still bear dimensions equal to the object
drawn to a definite scale, like sketches.
4. It is readable and could easily be understood by a layman, or any individual
who has little or no knowledge about scaling.
KINDS OF DIMENSIONS
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SYSTEMS OF DIMENSIONING USED
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ARRANGEMENT OF DIMENSION FIGURES
1. CONTINUOUS (Aligned) SYSTEM. All the figures here are in line with each
other forming a column. This is applicable if the figures are only few. Rather it
is a poor practice in a series of parallel dimensions.
2. STAGGERED SYSTEM. In this idea, the figures are not arranged in line but at
random. This is a preferred practice in multiple dimensions, as recommended.
The major objective here is readability of the figures.
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III. Direction
Read and understand the information given and carefully read the instructions
before doing the succeeding tasks.
IV. Activities
Activity 1: LABEL THE VIEWS. In this task, you are going to label the views of the objects
provided by using any colouring materials you have. You may use any of the mediums:
● CRAYONS,
● WATER COLOR
● COLORING PENCILS/COLORING PENS.
Use RED for TOP VIEW, BLUE for FRONT VIEW, GREEN for RIGHT SIDE VIEW.
Understand and visualize the object carefully.
SAMPLE: ANSWER:
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Activity 2: Provide the Dimension. In this activity, you are going to give the dimensions of
the following objects.
answer
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Activity 3: In this activity, you will draw the orthographic projection of the
following object. Provide the dimensions as well.
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V. Reflection
Orthographic projection is the projection with all the views arranged at right
angles to each other. It describes the given object in size and design and it used as
the basis for all working drawings. There are three in presenting orthographic drawing:
the glass box approach (which is presented in this lesson), the 45 x 45 triangle method
and the compass method.
Dimensioning is focused on the study of the details of dimensioning a drawing
both orthographic and isometric views. It includes the systems used in dimensions,
placement, and constructions of lines and figures, the arrangement of figures in laying
out sizes, and the basic rules in dimensioning. Dimensions are classified according to
their uses and the application, as follows: size dimension and location dimension.
VI. References
B
A.
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