A partial viewshows only what is necessary to completely describe the object. A conventional break line is placed in a location where it does not coincide with a visible or hidden line.Partial views can be used to clarify a drawing by removing unnecessary features (usually shown with hidden lines).ANSI revolution conventions allow geometry to be revolved into positions that allow an object to be viewed true size and shape.Objects can be revolved on bolt circles.
Inclined arms can also be revolved perpendicular to the line of sight to allow for better visualization of the object.A removed view may have to be created that is at a different scale and thus cannot be aligned with the existing views.5.10 VISUALIZATION FOR DESIGNStudents will come to your class with truly diverse abilities to mentally create and manipulate graphic imagery (visualization). Either through their life experiences or through innate ability, some students are simply better at visualization than others. This does not mean that those who don't come to your class with strong skills can't be taught many of the skills presented in the text. What it does mean is that it will be worth your while to try to informally assess your student's visualization abilities, either through exercises presented in this chapter, direct observation, or other methods. The ability level of your students may influence the level of instruction needed to get students to an appropriate level of proficiency. It is important to emphasize the dynamic qualities of the visualization process. Not only can this dynamic process be taking place solely in one's head, but also between the mind, the eyes, and some physical stimulus such as a drawing or an object. To apply these ideas in a more functional way, have your students experience this feedback loop. If you have already done some sketching exercises, then ask them to sketch a simple object in pictorial form. Now verbally describe changes you want them to make in their object (e.g. drill a hole through it, chamfer a corner, etc.). Ask them to first mentally imagine this operation and then sketch it. They can also do this completely on their own; have them start with a simple shape and then transform it into a common household object over a series of four or five sketches.Some point soon after starting the visualization exercises, tie the visualization process back to the engineering design process. You may want to run a brief brainstorming session designing a product. First as a group and then individually, have them generate a half dozen or so design concepts for a product. Have them focus on variations in the geometry between the designs.5.11 SOLID OBJECT FEATURESHaving physical objects of simple geometric shapes available is a great help in explaining the concepts and conducting exercises in this section. They can be quickly made from wood, foam, clay, paper, etc.
- Fall '09
- Orthographic Projection, Multiview Drawings