TECHNICAL SKETCHING. Drafting. The Universal Language Drafting is the process of accurately representing three-dimensional objects and structures on a two-dimensional surface, usually paper. An accurate drawing process used for nearly every product or structure made today – large or small.
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Different techniques are used to show the artifact as the human eye would see it. Therefore, a single view is used to show how the front, sides, and top would appear.
Pictorial drawings show several sides at the same time. Many people find pictorial drawings easier to understand. They do not provide as much information as orthographic views.
Isometric means equal measure.
Angles formed by the lines at the upper right corner are equal to 120 degrees.
Object is shown as if viewed from one corner.
Different lines are used to show the outlines and major details on an object.
Object lines are the darkest lines which show the outlines and major details.
Hidden lines are dotted lines used to show outlines which are not visible in a certain view.
Center lines locate holes in a part. These lines pass through the center of the hole.
Extension lines, used in dimensioning, indicate the points from which the measurements are taken.
Between the extension lines are the dimension lines. These have arrows pointing to the extension lines that indicate the range of the dimension.