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39 terms

Orthographic/ Alphabet of Lines

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Borderline
A Thick line that frames the title block and drawing
Object Line
A think line that shows the visible edges of an object. The most clearly visible line in a drawing.
Hidden line
A thin dashed line that shows an edge not normally visible in a view. Dashes are 1/8" long with spaces of 1/16"
Center Line
A thin line that shows the center points of arcs, circles, and the center of symetrical objects. Short dash is 1/8" and long dash ranges from 1/2" to 1-1/2" in length. Center lines always extend 1/4" Beyond the object they are applied to.
Dimension Line
A thin line with arrowheads at each end, broken in the middle for the dimension
Extension Line
A thin line that extends from the dimension line to the point on the object to which the dimension refers.
Leader
A thin, angled line with an arrowhead at one end and a note or dimension at the other. Used to show the exact location of note or dimension
Cutting Plane Line
A think line that shows where an imaginary cutting-plane passes throughan object
Section Line
A thin line used to show the surface cut in a section view. Drawn diagonal on each surface touched by the cutting-plane
ANSI
Standards or conventions to which drawings are drawn
Cylindrical Surface
A rounded surface forming two curved lines of intersection or circular edges
Fillet
Small rounded inside corner of an object
Fold Line
A theoretical line between two views where viwing planes fold
Foreshortened
To appear shorter to the eye than it actually is
Inclined Plane or Surface
A plane surface that is foreshortened in two principal viewing planes and an edge view in one other principal viewing plane
Normal Surface
A true size of a plane that is parallel to one principal viewing plane and shown as an edge view in other two principal views
Oblique Plane or Surface
A plane or surface that is foreshortened in all three principal viewing planes.
Perpendicular
A line or surface at a 90-degree angle to another line
Primary Picture Planes
Front, top, or side reference planes
Rotation
To turn or twist in order to view a particular surface
Round
Small rounded outside corner of an object
Skew Lines
Non-intersection lines, not parallel to each other or to the principal views
True Size
A surface that is shown in its actual size
Depth
Distance from the front to the back plane
First-Angle Projection
All views are projected onto planes located behind the object
Height
Distance form the bottom plane to the top plane
Line
Straight element that is generated by a moving point and has extension only along the path of the point
Line of Sight
Direction from which an object is viewed
Normal Plane
True size plane that is parallel to one principal viewing plane and edge view in other two planes
Orthographic Projeciton
Method of representing the exact shape of an object in two or more views on planes at right angles to each other
Perpendicular
A line 90 degrees to a given projection
Projection Lines
Lines which are extended out from the object lines to an adjacent view
Third Angle Projection
All views are projected onto planes lying between the object viewer
Visualize
To form a mental picture or image
Width
Distance from the left side to the right side of the front or top plane
Front
View that shows the most detail and the fewest hidden lines
Front
Show the height and width dimensions
Right
Shows the Height and depth dimensions
Top
Shows the width and depth dimensions