Microsoft Word - lecnote_fm_engineering drawing

Which views should one choose for a multi view drawing? The views that reveal every detail about the object. Three views are not ...

projection. The finished drawing is then reproduced and sent to the shop or to the job site. To design and communication every d ...

directions, generally at right angles to each other and arranged relative to each other in a definite way. Each of the views sho ...

The Glass Box method, used primarily for descriptive geometry problems, requires that the user imagine that the object, points, ...

Figure 5.7 Glass box methods ...

Figure 5.8 Orthographic projection of objects B. Orthographic views It is the picture or view or thought of as being found by ex ...

If transparent plane is placed horizontally above the object, the projection on this plane found by extending perpendiculars to ...

Figure 5.9 Principal Picture Planes ...

In actual work, there is rarely an occasion when all six principal views are needed on one drawing. All these views are principa ...

The six principal views of an object or the glass box have previously been presented in the type of orthographic projection know ...

Figure 5.11 First angle projections 5.2.2 Classification of surfaces and Lines in Orthographic Projections Any object, depending ...

surface limit is a line that indicates the reversal of direction of a curved surface. A. Horizontal, Frontal and Profile Surface ...

B. Inclined Surfaces An edge appears in true length when it is parallel to the plane of projection, as a point when it is perpen ...

Figure 5.13 Examples of objects having inclined surfaces C. Oblique Surfaces A line that is not parallel to any plane of project ...

Figure 5.14 Examples of objects having oblique surfaces D. Hidden Surfaces To describe an object with complex internal features ...

figure 5.15, the drilled hole that is visible in the top-side view is hidden in the front and right side views, and there fore i ...

E. Curved Surfaces To represent curved surfaces in orthographic projections, center lines are commonly utilized. All the center ...

The standard symbol for center lines on finished drawings is a fine line made up of alternate long and short dashes. Figure 5.16 ...

When a centerline and cutting- plane line coincide, the one that is more important to the readability of the drawing takes prece ...

approximately as they appear to the observer. This type of drawing is called pictorial drawing. Since pictorial drawing shows on ...