Copyright Goodheart-Willcox Co., Inc. 130 Section 2 Fundamentals of Shape Description Summary • Section views are based on an imaginary cut of the object in some fashion and are created to help show interior detail. • Two types of lines exclusive to section views are the cutting-plane line and the section line. • Section lines can also incorporate dashed lines and patterns to symbolize a particular material or categories of material, such as steel, alloys, plastic, or marble. • Full sections are those in which the object is cut fully through, while half sections are those in which the object is cut halfway through. • The cutting-plane line can be offset through features that are not aligned, resulting in an offset section or an aligned section. • A broken-out section allows for a partial cut into the object and incorporates the short break line. • Removed and revolved sections allow for a “cut and revolve” cutting-plane technique, sometimes directly on the view, but sometimes removed out of projection. • For clarity’s sake, various conventional practices are used when cutting through features such as webs, ribs, and spokes. • Partial sections and outline sections can be implemented to make drawings less cluttered and for clarity’s sake. • Section techniques can also be applied in partial views and auxiliary views. • When multiple parts are represented in an assembly drawing, section-view patterns are implemented at different angles and spacing to help clarify the assembly. • Computer-generated sectional views can be easily generated from the 3D model but may show some features in a slightly different fashion than traditional drawing practices.