Hamrock • Fundamentals of Machine ElementsChapter 1: IntroductionThe invention all admir’d, and each, how heTo be th’ inventor missed; so easy it seem’dOnce found, which yet unfound most would have thoughtImpossibleJohn Milton
Hamrock • Fundamentals of Machine ElementsFigure 1.1 Approaches to product development. (a) Classic approach, with large design iterations typical of the over-the-wall engineering approach. (b) A more modern approach, showing a main design flow with minor iterations representing concurrent engineering inputs. Product Development Approaches
Hamrock • Fundamentals of Machine ElementsFigure 1.2 Safety factor characteristics A, B, and C. Figure 1.3 Safety factor characteristics D and E.Pugsley Method for Safety FactorSafety Factor:Pugsley Equation:
Hamrock • Fundamentals of Machine ElementsFigure 1.2 Effect of manufacturing and assembly considerations on design of a reciprocating power saw. (a) Original design, with 41 parts and 6.37-min assembly time; (b) modified design, with 29 parts and 2.58-min assembly time.