Activity 2.4 Multiview Sketching
Introduction
It’s a very common occurrence to see a product advertisement and think, “I thought of an idea for something like that just a few months ago.” People spend a lot of time in their various interest areas and envision ideas for making things work better. Spend some time with someone who has a permanent disability and see how many product ideas come to mind that would provide a degree of freedom to a person who has lost a physical capability. Coming up with wonderful ideas are only the first step in developing solutions to problems. At some point, ideas must be built.
You've practiced different techniques for sketching objects so that they appear to have a three-dimensional quality. These techniques are excellent for quickly communicating ideas to both technical and nontechnical people. Those who make their living building ideas require a different type of drawing format. A multiview sketch, also referred to as an orthographic projection sketch, is the standard sketch format used by engineers to communicate ideas to professionals in the building trades.
However, pictorials do not provide accurate information about the true size and shape of an object and all of its features. It is often the case that engineered objects have features and edges that are obscured by the standard surface views of a multiview drawing. These views require hidden lines. When engineers create drawings of cylindrical objects, or objects that have holes, they must represent their axes and axes points with centerlines.
Knowing how to sketch and interpret multiviews is an important skill for any engineer. In this activity, you will develop your ability to see and sketch objects as a series of related two-dimensional views. Understanding and using the different line conventions, discussed earlier in this lesson, will help when creating these views.
It’s a very common occurrence to see a product advertisement and think, “I thought of an idea for something like that just a few months ago.” People spend a lot of time in their various interest areas and envision ideas for making things work better. Spend some time with someone who has a permanent disability and see how many product ideas come to mind that would provide a degree of freedom to a person who has lost a physical capability. Coming up with wonderful ideas are only the first step in developing solutions to problems. At some point, ideas must be built.
You've practiced different techniques for sketching objects so that they appear to have a three-dimensional quality. These techniques are excellent for quickly communicating ideas to both technical and nontechnical people. Those who make their living building ideas require a different type of drawing format. A multiview sketch, also referred to as an orthographic projection sketch, is the standard sketch format used by engineers to communicate ideas to professionals in the building trades.
However, pictorials do not provide accurate information about the true size and shape of an object and all of its features. It is often the case that engineered objects have features and edges that are obscured by the standard surface views of a multiview drawing. These views require hidden lines. When engineers create drawings of cylindrical objects, or objects that have holes, they must represent their axes and axes points with centerlines.
Knowing how to sketch and interpret multiviews is an important skill for any engineer. In this activity, you will develop your ability to see and sketch objects as a series of related two-dimensional views. Understanding and using the different line conventions, discussed earlier in this lesson, will help when creating these views.
Conclusion
1. What is the purpose of construction lines? Object lines? Construction lines are used to guide where you will draw your object lines to form lines and shapes. Object lines are what compose the shape/figure.
2. What is the purpose of hidden lines and center lines? Hidden lines "show" objects/shapes that are hidden in that perspective view. Center lines show where the center of that part of the figure lies.
3. What type of pictorial is shown in the first representation in item 2? How can you tell? It is an oblique pictorial. Because the item is 3D, we know that it is oblique.
4. What type of pictorial view is shown in item 6? How can you tell? This is an oblique pictorial drawing. Because the item starts on an edge and is 3D, but isn't Isometric or perspective, we know it has to be an oblique pictorial.
5. Why would building professionals, such as machinists and contractors, prefer multiview drawings over pictorial drawings? So they can look at the front view, sides, and top to know all dimensions of the building without having to estimate.
1. What is the purpose of construction lines? Object lines? Construction lines are used to guide where you will draw your object lines to form lines and shapes. Object lines are what compose the shape/figure.
2. What is the purpose of hidden lines and center lines? Hidden lines "show" objects/shapes that are hidden in that perspective view. Center lines show where the center of that part of the figure lies.
3. What type of pictorial is shown in the first representation in item 2? How can you tell? It is an oblique pictorial. Because the item is 3D, we know that it is oblique.
4. What type of pictorial view is shown in item 6? How can you tell? This is an oblique pictorial drawing. Because the item starts on an edge and is 3D, but isn't Isometric or perspective, we know it has to be an oblique pictorial.
5. Why would building professionals, such as machinists and contractors, prefer multiview drawings over pictorial drawings? So they can look at the front view, sides, and top to know all dimensions of the building without having to estimate.