SEGMENT 5: ORTHOGRAPHIC PROJECTION
C-Size Titleblocks
3RD ANGLE PROJECTION DRAWINGS
First Angle Projections
SECTION 6.1
-The views that make up multiview drawings are developed using the principles of orthographic projection. In first-angle projection, the object is projected onto the planes from the first angle, or quadrant. Third-angle projection uses the third quadrant, not the first, for projection. -The number of views needed to describe an object completely depends on its shape and characteristics. -Multiview drawing represents an object on paper using views as seen from different positions. These views are then arranged in a standard order so that trained drafters can understand them. -Views are chosen based on an object’s characteristic view, its normal position, and the relative number of hidden lines in the views that are being considered. |
SECTION 6.2
-Although CAD techniques may differ in their approach from board drafting techniques, all drafting principles apply equally to both. However, CAD has tools that add efficiency to the processes. -One way to create a multiview drawing using CAD is to create the necessary views independently of each other. -A second method for creating multiview drawings is to extract the necessary views from a 3D model. |
OTHER KEY TERMS
Content Vocabulary
• visualization • implementation • multiview drawing • normal view • orthographic projection • first-angle projection • third-angle projection • wireframe • solid model |
Academic Vocabulary
• technical • distorted • locate • offset |