Technical Drawings give detailed information about Structure, Dimensions, Materials and Assembly
The main ones are Isometric Projections, Planometric Projections and Perspectives
Projections are three-dimensional shapes on a 2D surface, like a sheet of paper. They give the illusion of depth
For working drawings, there are also Orthographic Projections, Sections and Assembly Details
In an Isometric Projection all vertical lines on an object remain vertical while horizontal lines are drawn at 30°
The main ones are Isometric Projections, Planometric Projections and Perspectives
Projections are three-dimensional shapes on a 2D surface, like a sheet of paper. They give the illusion of depth
For working drawings, there are also Orthographic Projections, Sections and Assembly Details
In an Isometric Projection all vertical lines on an object remain vertical while horizontal lines are drawn at 30°
Isometric projection distorts shapes slightly in order to keep all upright lines vertical (and because perspective is ignored)
Their advantage is that they show the object's dimensions accurately and in the correct proportions, making it easy to draw them from the Plan View and to scale
In Planometric Projections, also called Axonometric projections all vertical lines on an object remain vertical, while horizontal lines are drawn at 45°
Planometric projections (like isometric drawings) show all dimensions accurately and to scale, and are frequently used to show buildings or room layouts
Because they are drawn with 45° angles, there is no distortion, so that a circular object - say, a stool on the floor - can be shown as a true circle.
Isometric projection distorts shapes slightly in order to keep all upright lines vertical (and because perspective is ignored)
Their advantage is that they show the object's dimensions accurately and in the correct proportions, making it easy to draw them from the Plan View and to scale
Their advantage is that they show the object's dimensions accurately and in the correct proportions, making it easy to draw them from the Plan View and to scale
Planometric projections (like isometric drawings) show all dimensions accurately and to scale, and are frequently used to show buildings or room layouts
Because they are drawn with 45° angles, there is no distortion, so that a circular object - say, a stool on the floor - can be shown as a true circle.
Photo taken 20th May '10
Images and text from
BBC Bitesize
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