Technical Drawings Flashcards
The two main types of technical drawings used in industry
Orthographic and Pictorial
The two types of projection in orthographic drawings are
First Angle and Third Angle
ISO stands for
International Standards Organization
First-angle projection is used where
Europe
Third-angle projection is used where
North America
In first-angle projection the object is viewed from
Left to right
In third-angle projection the object is viewed from
Right to left
The term Ortho means
At right angles (90 degrees)
The Plan view the object is viewed from
The top or bottom
Technical drawings are usually in
Orthographic projection
The most common pictorial drawings are termed
Isometric and oblique
What type of drawing are all the lines either vertical or at 30 degrees to horizontal
Isometric
What type of drawing is one face at right angles to the horizontal and the others are at an angle of 45 degrees to the horizontal
Oblique
Thick lines which indicate the visible outline of an object are called
Object lines
Thin, equally spaced broken lines are called
Hidden lines
Lines used to shorten the view of a long uniform section are called
Break lines
Parallel diagonal lines that identify a sectional view of an object are called
Section lines
Thin broken lines with short and long lines spaced alternately are called
Centerlines
Lines with letters such as A-A placed beside arrow keys to the corresponding sectional view are called
Cutting plane lines
Thin lines that extend the object lines out to a convenient space for dimensioning are called
Extension lines
Thin lines that indicate the distance between the extension lines are called
Dimension lines
All dimension figures except angular dimensions are written parallel to the dimension lines
Aligned dimensioning
All figures are written parallel to the bottom of the drafting paper
Unidirectional dimensioning
Arcs, rounds, or fillets are shown in the form of a
Radius measurement
