58 Welding Print Reading Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Sectional views (or sections) permit the true internal shape of a complex object to be shown with- out the confusion caused by a myriad of hidden lines. A sect ional view shows how the object would appear if an imaginary cut (known as the cutting plane) were made through the object perpendicular to the direc- tion of sight. Shown in Figure 5-14, the section or portion of the object between the eye and the cutting plane is removed or broken away to reveal the interior features of the object. This makes the shape of the object more understandable. Figure 5-15A shows the exterior surface of a pin. Notice that the interior features shown in Figure 5-15B are easier to visualize if a full section view is provided. Cutting-Plane Line The cutting-plane line indicates the point from which the imaginary cut of the section is taken from the part, Figure 5-16. The arrows at the end of the cutting-plane line show the direction of sight for viewing the section. Three forms of cutting-plane lines are accepted for general use, Figure 5-17. Sections are usually identified with bold capital letters (A-A, B-B, etc.) if they are moved to another position on the drawing. Figure 5-14. A sectional view shows how an object would appear if an imaginary cut were made through the object perpendicular to the direction of sight. This allows interior features to be seen without the confusion of many hidden object lines. Figure 5-12. Only two views are needed on simple objects like this piston pin, which can be fully illustrated on a drawing with little difficulty. Figure 5-13. A complex object with many interior features may result in a drawing with a maze of confusing hidden lines. Figure 5-15. A—The exterior surfaces of a pin are shown. B—The interior features of a pin are shown. B A