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Orthographic Views

Chapter Description

In this sample chapter from Engineering Design Graphics with Autodesk Inventor 2020, author James D. Bethune presents orthographic views using third-angle projection in accordance with American National Standards Institute (ANSI) standards. International Organization for Standardization (ISO) first-angle projections are also presented.

Section Views

Some objects have internal surfaces that are not directly visible in normal orthographic views. Section views are used to expose these surfaces. Section views do not include hidden lines.

  • section view

  • A view used to expose an internal surface of a model.

Any material cut when a section view is defined is hatched using section lines. There are many different styles of hatching, but the general style is evenly spaced 45° lines. This style is defined as ANSI 31 and will be applied automatically by Inventor.

Figure 4-36 shows a three-dimensional view of an object. The object is cut by a cutting plane. Cutting planes are used to define the location of the section view. Material to one side of the cutting plane is removed, exposing the section view.

  • cutting plane

  • A plane used to define the location of a section view.

Figure 4-37 shows the same object presented using two dimensions. The cutting plane is represented by a cutting plane line. The cutting plane line is defined as A-A, and the section view is defined as view A-A.

All surfaces directly visible must be shown in a section view. In Figure 4-38, the back portion of the object is not affected by the section view and is directly visible from the cutting plane. The section view must include these surfaces. Note how the rectangular section blocks out part of the large hole. No hidden lines are used to show the hidden portion of the large hole.

Exercise 4-6 Drawing a Section View Using Inventor

Figure 4-39 shows the front and top views of the object defined in Figure P3-10. A section view will be created by first defining the cutting plane line in the top view, then projecting the section view below the front view.

  • 01.jpg Click the Section View tool on the Create panel under the Place Views tab, then click the top view.

    The cursor will change to a +-like shape.

  • 02.jpg Define the cutting plane by defining two points on the top view.

    See Figure 4-39. Note that if you touch the cursor to the endpoint of one of the hole’s centerlines, a dotted line will follow the cursor, assuring that the cutting plane line is aligned with the holes’ centerlines.

  • 03.jpg Right-click the mouse and select the Continue option.

    The Section View dialog box will appear. See Figure 4-40.

  • 04.jpg Set the Label letter for A, the Scale for 1:1, and Style for Hidden Lines.

  • 05.jpg Move the cursor so as to position the section view below the front view.

  • 06.jpg Click the section view location.

  • 07.jpg Add the appropriate centerlines using the Centerline Bisector tool.

    Figure 4-41 shows the resulting section view. Notice that the section view is defined as A-A, and the scale is specified. The arrows of the cutting plane line are directed away from the section view. The section view is located behind the arrows.

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