# Orthographic/ Alphabet of Lines

### 39 terms by terrica315

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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.

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

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