Lesson 27-Orthographic Sketching

* Orthographic Drawing-is the process of representing the exact size & shape of an object in 2 or more views as they are seen perpendicularly from it's surfaces.
6 Principal Views of an Object:
1. Top View
2. Front View
3. Right Side View
4. Left Side View
5. Back/Rear Viiew
6. Bottom View
Guidelines in Orthographic Projection:
1. Locate the center of your drawing paper & draw vertical & horizontal axis.
2. Draw the Front View at the lower left quadrant.
3. Draw the Top View at the upper left quadrant above the Front View.
4. Draw the Right Side View at the lower right quadrant beside the Front View.
5. The Front View is the same as the Top View.
6. The height of the Front View is the same as the Right Side View.
7. The width of the Top View is the same as the Right Side View.
8. The nearest edges of the views to the 2 axes is about 3/4".
9. For accuracy,use projection lines.
10. Use 45 deg.triangle to project the Top View to Right Side View.
11. Dimension lines are placed between views.
12. Names of views are written outside the views.