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Drafting

The document outlines various drafting techniques including isometric, orthographic, and pictorial methods, along with tools used for drafting such as T-squares, compasses, and rulers. It emphasizes the importance of accurate dimensions, lettering standards, and different types of lines used in technical drawings. Additionally, it discusses the significance of projection methods and dimensioning in creating precise representations of objects.

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Egie Alarcon
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4 views7 pages

Drafting

The document outlines various drafting techniques including isometric, orthographic, and pictorial methods, along with tools used for drafting such as T-squares, compasses, and rulers. It emphasizes the importance of accurate dimensions, lettering standards, and different types of lines used in technical drawings. Additionally, it discusses the significance of projection methods and dimensioning in creating precise representations of objects.

Uploaded by

Egie Alarcon
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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DRAFTING

Isometric – 3 dimensional, 30
degrees, 30 x 60 degrees
Orthographic – 3 view, exact
shape, actual observation,
planes of projection
Geometric Construction –
accurate shape / angles / lines
Pictorial – can be seen by
naked eye
Perspective – most realistic,
visual observation
 Horizontal lines – T-Square
 Vertical lines – Triangles
 Circle or an arc - Compass
 Angle or an arc – Protractor
 Sketches – Ruler
Height – Meterstick
Drafting – systematic representation
Drawing – international language
Mechanical – with instruments
Freehand – paper and pencil
Dimension line – ¼ inch
(dimensioning)
Extension line – 1/16 to 1/8 inch
(dimensioning)
Subtitle – 3/16 inch
Good standard height for lettering 1/8
inch
Divider – dividing lines
French curve – curves except circles
and arcs
Scale – reproduce, reduce or enlarge
Center line – circle dimension,
diameter
Protect rest of drawing, erasing shield
Make pencil point sharp, pencil
sharpener
Indicate measurement – dimension
line
Dark solid line, show visible edges –
visible line
Composed of dashes, show invisible
edges – hidden line
Has been cut away – long break line
Cutting plane cut through – section
line
Gradual darkening – shading
Never letter without Guidelines
Most important part – Lettering
Cap line Ascender, limit capital letters
Base line All letter stands and rest
Waist line – limit height of lower-case
letter
Drop line – descender, limit lower case
Commonly used in college – Gothic
Commonly used in college diploma –
Old English
 Uniform width – Gothic
 Slanting – Italic
 Cursive – Script
 Fancy – Text letters
 Alphabet of lines – specific meaning
 Drawing of lines – emphasize or de-
emphasized
 Smallest division – millimeter
 Metric - meter
Origin zero point of a line graph
Pie graph percentage comparison
descriptions of tangent lines except,
the point of intersection is the radius.
horizontal lines – It is drawn from left
to right
Boxing method – isometric
After 2-dimensional drawing are done,
next step is – Dimensioning
Imaginary cut – Sectioning
Manual drafting – lettering by hand
Dimensions – Tolerancing
Single-stroke letters – free and natural
fashion
Serifs Lines at end of every letter
except O in Roman letters
Lettering box tools made of plastic or
aluminum for lettering
3rd angle projection, Right side view,
Left side view, and bottom side view
Frontal plane Additional plane of
projection
Superfluous dimensioning – repetition
Assemble parts section to be detailed
Approach – Dual dimensioning system
Size of reinforcement bars – Top view,
Front view, Side view, and Isometric
Parallel line – Lines of sight
Commonly used in TLE drafting –
Roman

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