TLE - 3rd Quarterly Examination

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35 Terms

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Drafting
is called a “universal language”
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Drafting

It is used to communicate ideas between designer and production team

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Lines
are part of a specialized graphic language that is standardized throughout industry.
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Construction Lines and Guidelines
Very light, easily erased lines that are used to block the main lay out.
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Visible Lines
are the edges or outlines of an object.
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Visible Lines
is used to indicate all visible edges of an object.
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Visible Lines
They should stand out clearly in contrast to other lines so that the shape of an object is apparent to the eye.
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Hidden Line

is used to show surfaces, edges, or corners of an object that are hidden from view.

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CENTER LINES
are used to show the center of holes and symmetrical features.
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SYMMETRY LINES
are used when partial views of symmetrical parts are drawn.
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SYMMETRY LINES

It is a center line with two thick parallel lines drawn at right angles to it at both ends.

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EXTENSION and DIMENSION LINES
are used when dimensioning an object.
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Extension lines
extends from the object in order to show the dimension limits.
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Dimension lines
indicate the measurements of the object
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LEADERS
are used to indicate the part of the drawing to which a note refers.
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BREAK LINES
are used when it is desirable to shorten the view of a long part
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LONG BREAK LINES
eliminate repetitive details w/o changing the size of its view
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LONG BREAK LINES

are thin straight zigzags

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SHORT BREAK LINES
thick line drawn in freehand to show details that a part has been cut off or broken out
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SHORT BREAK LINES

are thick wavy freehand lines

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CUTTING-PLANE LINE

is used to designate where an imaginary cutting took place.

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VIEWING-PLANE LINE

is used to indicate direction of sight when a partial view is used.

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SECTION LINES

is used to indicate the surface in the section view imagined to have been cut along the cutting-plane line

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PHANTOM LINES
are used to indicate alternate position of moving parts, adjacent position of moving parts, adjacent position of related parts, and repetitive detail
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Object/visible line

Hidden line

Cutting plane line

Center line

Break line

Dimension and extension line

Section line

Hierarchy of Line (In order)

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Pictorial Drawing

shows likeness of an object as viewed by the observer.

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Pictorial Drawing

It represents a portion of the object and shows the method of its construction.

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Pictorial Drawing

In some presentations, the whole object is shown in one view.

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Oblique Drawing

A pictorial drawing of an object one surface of which is shown parallel to the frontal plane and the other is inclined to it. (45 degrees)

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Perspective Drawing

drawing having a vanishing point.

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Isometric Drawing

A pictorial drawing showing the three faces of the object Tilted 30˚ in front of the observer.

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Isometric Drawing

All 3 axes are scaled at 120 degrees

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Orthographic Projection

It refers to the collection of 2D drawings that work together so that the shape of an object is apparent to the eye.

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Top view

Front view

Left side view

Right side view

Rear view 

Bottom view

6 faces/views of a 3D object

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Vertical axis

Right-cross axis

Left-cross axis

Axes used in Isometric Drawing

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