Question

projections and their use in technical drawings (pp. 343 - 351)

1. an object can be drawn from six different angles.

a) what are these six views?

b) which views are conventionally used when drawing a multiview projection of an object?

1. look at these three drawings of the same object.

a) which projection was used for each drawing?
1
2
3

Explanation:

• For part a) of question 2: In technical drawing, the six standard views of an object are the front view, top view, right - side view, left - side view, bottom view, and rear view. These views are based on the orthographic projection principle where the object is projected onto six mutually perpendicular planes.
• For part b) of question 2: Conventionally, when drawing a multiview projection of an object, the front view, top view, and right - side view are used. These three views are sufficient in most cases to convey the shape and dimensions of the object clearly as they provide orthogonal (perpendicular) perspectives that can be related to each other using projection lines.
• For question 3a):
• Drawing 1: Oblique projection is a type of parallel projection where the object is represented with one face parallel to the projection plane and the other faces at an angle. In oblique projection, typically one set of axes (usually the depth axis) is foreshortened.
• Drawing 2: Isometric projection is a type of axonometric projection where the three axes of the object are equally foreshortened and the angles between the axes are \(120^{\circ}\). This gives a three - dimensional appearance of the object.
• Drawing 3: Multiview projection presents the object in two - dimensional views (usually orthographic) on different planes. Here, it is a single two - dimensional view (likely a front or principal view) that is part of the multiview set.

Answer:

• 2a) Front view, top view, right - side view, left - side view, bottom view, rear view.
• 2b) Front view, top view, right - side view.
• 3a) 1. Oblique projection; 2. Isometric projection; 3. Multiview projection.