Engineering Design Communication and Modeling Using Unigraphics NX

Chapter 9: Additional Modeling Features

9.1 INTRODUCTION

There are many more standard features such as rounds, chamfers, and tapers, in addition to those introduced in Chapter 6). They are defined as nonfunctional features in this book. Although these features are not necessarily used directly in realizing the desired kinematics and dynamics, their function in machinery is to reduce stress levels and ease manufacturing and assembly difficulties. The existence of nonfunctional features in design models is just as important as that of functional features. In this chapter, we will discuss methods to model these features and how they are used in mechanical design. Also, we will describe methods to create more features such as hollows and threads, and methods to create features with patterns.

9.2 LEARNING OBJECTIVES

Upon the completion of this chapter, you will be able to:

  • Create rounds

  • Create chamfers

  • Create tapers

  • Create linear patterned features

  • Create radial patterned features

  • Make use of symmetry

  • Create models with hollows

9.3 EDGE AND FACE FEATURES

Edge and face features in most cases are nonfunctional in the kinematics of a machine design. Their main purpose is to reduce stress concentration and ease installation difficulties. For example, a steel shaft is subject to a transverse bending load of 1000 N at the right end as shown in (Figure 9-1.


Figure 9-1: Cantilever shaft

This example can be simplified as a cantilever beam, which is fixed at the left end. A 1000 lb transverse load is applied to the right end. Using the finite element analysis module, Scenario (integrated...

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