73 Copyright Goodheart-Willcox Co., Inc. Technical Terms depth fillet first-angle projection frontal plane height horizontal plane inclined surface multiview drawing normal surface oblique surface orthographic projection profile plane projectors round runout spatial visualization third-angle projection width Learning Objectives After completing this unit, you will be able to: ❑ Define spatial visualization. ❑ Explain the relationship between an orthographic projection and a multiview drawing. ❑ Identify and define the three dimensions of an object. ❑ Define the six principal views and the three regular views. ❑ Identify the three principal projection planes. ❑ Explain three visualization principles for multiview drawings. ❑ Identify the three types of flat surfaces. ❑ Explain characteristics of cylindrical surfaces. ❑ Explain characteristics of fillets, rounds, and runouts. ❑ Identify differences between third-angle and first-angle projection. ❑ Discuss computer-generated views. Multiview Drawings Unit 5