Orthographic Projection Drawing Abilities Teacher © J Lewis 2004

Isometric view This shape is obviously not easy to understand from this view as some of it is hidden. By looking from different directions, it is possible to gain all the information. © J Lewis 2004

This view of the simulation from the front is called the Elevation – it obviously tells us only a very small part of the story - more views are needed. We also need information about the right hand end where part of the shape has been removed – hidden lines need to be shown. Viewing from the front © J Lewis 2004

This is the view from the left hand end, called the End Elevation. Notice that this view does not show any signs of the piece cut out of the right hand end because hidden lines are not shown in this simulation. Viewing from the left © J Lewis 2004

Moving from one view to another It is easy to see how the End Elevation is drawn as the view from the left hand end. Notice that we still have not shown all the information about the object. © J Lewis 2004

Viewing from the right hand end Here the End Elevation is drawn by viewing from the right hand end. A view from above, called the Plan view, is required to complete the information. © J Lewis 2004

Creating the Plan view The Plan view is probably the most difficult view as it involves the depth of the object which is not visible from the Elevation. © J Lewis 2004

Hidden lines The pictures in the previous slides have not shown the hidden lines which are behind parts of the object. These are drawn as dashed lines in manual drawings but as yellow lines in this simulation. © J Lewis 2004

Plan Elevation Four views The arrangement shown is called THIRD ANGLE PROJECTION © J Lewis 2004 End Elevation

Third Angle Projection using the correct drawing conventions Note that dashed lines are hidden lines. Note also the use of the 3 rd angle symbol © J Lewis 2004

Which dimensions are the same? © J Lewis 2004

Which dimensions are the same? © J Lewis 2004

Which dimensions are the same? © J Lewis 2004