Introduction

Orthographic projections are a collection of 2D drawings that work together to give an accurate overall representation of an object. The drawings in an orthographic projection can be derived by envisioning the object within a glass box:
 
Images from ADD_Intro-task1.pptx

To draw orthographic projections:

1. Draw the front view:
   
2. Draw projection lines:
   
3. Complete the top view using projection lines as a reference:
   
4. Draw projection lines across and a 45° line at the intersection of projection lines:
   
5. Start the side view:
   
6. Use dashed projection lines :
   
7. Clean up the drawing:
   

Isometric drawings simulate a 3D object from a particular viewpoint by aligning the object along the x, y and z axis. Isometric and perspective projections differ from each other in that in an isometric drawing, all the edges of the form are parallel, while in the perspective projection, edges taper towards one or more vanishing points. The isometric drawing is easier to construct, preserves all scales and dimensions, and is the preferred method for mechanical drawings. Perspective drawings are trickier to draw properly, and the drawing does not preserve scale or dimension. Perspective projection is the preferred method for architectural drawings.


Here are the steps to go from an orthogonal projection to an isometric projection:

Image from Amherst-Pelham Regional High School

Quest

"I need a flat hook to hang pots and pans. I was given the drawing below and asked to identify what type of drawing it is and to build a model that adheres to the dimensions, but I can't make heads or tails out of it. I need to have this flat hook by the end of the day."

Tell the guard that you can help him. Build his model using the drawing below as a guide. You should use deferred tangents, offsets and fillets. Extrude (or PRESSPULL) the 2D form so that the final model has a height of 4mm.