Activity 2.3 Glass Box
Introduction
Objects to be produced accurately often require more than a pictorial sketch. Multiview drawings provide an accurate representation of an object which can be used to create a physical object. Typically multiview drawings are used to show views of the faces of the object as if the viewer is looking directly at that face so that the line of sight is perpendicular to the face. This depicts the surface as the true size and shape.
The idea of orthogonal projections can be demonstrated using a glass box. Place an object in a glass box so that the faces of the object are parallel to the sides of the box. The features of each surface of the object can be projected onto a side of the glass box by drawing lines to indicate the object edges on the glass box surfaces.
In this activity you will design and build a box from a flat sheet of transparency film. You will then use your glass box to help you sketch orthogonal projections of an object and create multiview drawings.
Objects to be produced accurately often require more than a pictorial sketch. Multiview drawings provide an accurate representation of an object which can be used to create a physical object. Typically multiview drawings are used to show views of the faces of the object as if the viewer is looking directly at that face so that the line of sight is perpendicular to the face. This depicts the surface as the true size and shape.
The idea of orthogonal projections can be demonstrated using a glass box. Place an object in a glass box so that the faces of the object are parallel to the sides of the box. The features of each surface of the object can be projected onto a side of the glass box by drawing lines to indicate the object edges on the glass box surfaces.
In this activity you will design and build a box from a flat sheet of transparency film. You will then use your glass box to help you sketch orthogonal projections of an object and create multiview drawings.
Conclusion
1. How do you determine the orientation of orthogonal projections in a multi-view drawing? You'd first need to determine what your "front view" will be by choosing the side with the longest dimension, the least hidden lines/most amount of visible faces,
2. How would you describe the geometric relationship that exists between the adjacent views of a multiview drawing? From the front to the top view, the top will give a shape's depth which the front view will most likely not be able to give, or it'll give the shapes width/length, depending on where the front view is located.
3. Why is it important to lay out a multiview sketch with points and construction lines before drawing object lines? So you don't show wrong dimensions and your object lines line up in the intended ratio to the reference sketch. If drawing a "new" sketch, it is important so you don't erase your construction lines.
1. How do you determine the orientation of orthogonal projections in a multi-view drawing? You'd first need to determine what your "front view" will be by choosing the side with the longest dimension, the least hidden lines/most amount of visible faces,
2. How would you describe the geometric relationship that exists between the adjacent views of a multiview drawing? From the front to the top view, the top will give a shape's depth which the front view will most likely not be able to give, or it'll give the shapes width/length, depending on where the front view is located.
3. Why is it important to lay out a multiview sketch with points and construction lines before drawing object lines? So you don't show wrong dimensions and your object lines line up in the intended ratio to the reference sketch. If drawing a "new" sketch, it is important so you don't erase your construction lines.