Technical Drafting

1. DUMINGAG NATIONAL HIGH SCHOOL
Dumingag, Zamboanga del Sur
Learning Activity Sheets (LAS) TLE TECHNICAL DRAFTING
QUARTER 4 Week 7-8
GRADE 8
Name of Learner: ______________________________________ Section: _____________ Date: ______________
Teacher: __________________________________________________________________________ Score: __________
I. Background Information forLearners
LINES
Line is one of the basic elements of art along with color, form, texture, value, volume and
perspective. In Basic Math, you can create a line just by connecting two points. Line signifies many
meanings and translations. Take a look at your palm. Every line signifies meaning of your life. We see
or portray lines in the objects of nature. They are either visible or imaginative. We use them to draw the
forms of object or to track direction of movements. They give mental suggestions whether we are
conscious of it or not. There are two types of lines. Straight and Curved Lines.
KINDS OF STRAIGHT LINES
1. Vertical Line. Give
the quality of dignity,
royalty and jubilance.
2. Horizontal Line. Give the idea of
stability, stagnancy and tranquility.
3. Diagonal Line.
Suggest action,
progress and
ascension.
4. Broken Lines. Suggest conflict,
violence, speed and struggle.
TYPES OF CURVED LINES
1. Restrained Curve. One with a
subtle bend as the shape of a
woman’s body.
2. Simple Curve. Has more
pronounced bend than the
restrained curve.
3. Full Curve. More forceful than
the first two and follows
movements of the letter “c”.
4. Compound Curve. Changes the
bend towards the opposite
direction which follows the
graceful movements of letter “S”.
ALPHABET OF LINES
In drawing and drafting, lines are used to emphasize clearly and understand well what is being drawn. In the same way that letters are related
to words, lines describe drawings. Lines are characterized according to their forms (shape) and weight (thickness or thinness). Usually, medium soft
pencils (F or H) are used for thick lines, while slightly hard pencils (2H) are used for thinner lines. These lines are often called “Alphabet” of lines. The
figures below will show how each line looks like, and explains their uses and characteristics.
• OBJECT OR VISIBLE LINES – Thick dark line use to show outline of object,
visible edges and surfaces
• CONSTRUCTION LINE – Very light and thin line use to construct layout work
• DIMENSION LINE – Thin and dark lines use to show the size (span) of an object
with a numeric value. Usually terminates with arrowheads or tick markings.
• HIDDEN LINE – Short dash lines use to show non visible surfaces. Usually
shows as medium thickness
• CENTRE LINE – Long and short dash lines. Usually indicates centre of holes,
circles and arcs. Line is thin and dark.
• EXTENSION LINE – Thin and dark line use to show the starting and ending of
dimension.
• CUTTING PLANE LINE – Extra thick line use to show cutaway views or plane of
projection where a section view is taken. Arrow indicates direction of view
• SHORT AND LONG BREAK LINES –Short and long medium line use to show
cutaway view of a long section.
• LEADER LINE – Medium line with arrowhead to show notes or label for size or
special information about a feature.
• PHANTOM LINE – Long line followed by two short dashes use to show alternate
position of a moving part.
• SECTION LINE – Medium lines drawn at 45 degrees use to show interior view of
solid areas of cutting plane line.
• SHORT BREAK LINES– heavy wavy line and a freehand drawn. This is used where the break is short.
• LONG BREAK LINE– light lines with a short freehand portion inserted. This is used where the break is long
LESSON 4
PREPARE AND INTERPRET TECHNICAL DRAWING

2. • DITTO LINES- medium lines composed of short dashes grouped/paired.
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II. MELC/Learning Competencies
 LEARNING OUTCOME 1: Analyze signs, symbols, and data (TLE_ICTDT7/8UT-0h-1)
 LEARNING OUTCOME 2: Interpret technical drawings and plans (TLE_ICTDT7/8UT-0i-2)
III. TASK:
Free Hand: Copy the following exercises in technical drawing. Do not use any ruler in this activity. Use only pencil. Every box will be given 5 points
considering its’ neatness and following the instruction.
Technical Drawing. Using the following drawing instrument. Copy the picture given below.
Criteria 50 Points 30 Points 10 Points
Accuracy All lines are drawn appropriately
and correct.
Some lines are drawn
inappropriately and missing.
Most of the lines are
inappropriately drawn and NOT in
correct.
Neatness Finished output was neatly done,
pleasing to the eyes and no
erasures/smudges found.
Pleasing but erasures and
smudges are observable on the
finished output.
Finished output have so many
erasures and smudges and quite
unpleasant