EML 4905 Senior Design Project A B.S. THESIS PREPARED IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE DEGREE OF BACHELOR OF SCIENCE IN MECHANICAL ENGINEERING Pneumatic Pass‐Thru Impact Wrench 100% Report Ryan Lucia Felipe de la Cruz Milton Hidalgo Ceotto Advisor: Dr. Benjamin Boesl 11/25/2014 This B.S. Thesis is written in partial fulfillment of the requirements in EML 4905. The contents represent the opinion of the authors and not the Department of Mechanical and Materials Engineering. Page | ii ETHICS STATEMENT AND SIGNATURES The work submitted in this B.S. thesis is solely prepared by a team consisting of Ryan Lucia, Felipe de la Cruz, and Milton Ceotto and it is original. Excerpts from others’ work have been clearly identified, their work acknowledged within the text and listed in the list of references. All of the engineering drawings, formulations, design work, prototype development and testing reported in this document are also original and prepared by the same team of students. Page | iii TABLE OF CONTENTS ETHICS STATEMENT AND SIGNATURES ......................................................................................................... ii TABLE OF CONTENTS .................................................................................................................................... iii List of Figures ................................................................................................................................................ v List of Tables ............................................................................................................................................... vii Abstract ......................................................................................................................................................... 1 Introduction .................................................................................................................................................. 2 Problem Statement ................................................................................................................................... 2 Motivation ................................................................................................................................................. 3 Literature Survey ....................................................................................................................................... 4 Background ........................................................................................................................................... 4 Impact Wrench and Mechanism ........................................................................................................... 5 International Usage ............................................................................................................................... 6 Environment Impact ............................................................................................................................. 6 Power Consumption ............................................................................................................................. 7 Waste Reduction ................................................................................................................................... 7 Safety .................................................................................................................................................... 7 Cost Effect ............................................................................................................................................. 7 Concept of Pneumatic Pass‐Thru Impact Wrench ................................................................................ 8 Constraints and Other Consideration ....................................................................................................... 8 Project Formulation ...................................................................................................................................... 9 Project Objective ....................................................................................................................................... 9 Design .......................................................................................................................................................... 10 Conceptual Design .................................................................................................................................. 10 Proposed Design ..................................................................................................................................... 17 Analytical Analysis ....................................................................................................................................... 19 Simulation ................................................................................................................................................... 26 Prototype ..................................................................................................................................................... 29 Final Design ................................................................................................................................................ 32 Material Selection ....................................................................................................................................... 35 Manufacturing Process ............................................................................................................................... 36 Page | iv Cost Analysis ............................................................................................................................................... 53 Testing & Evaluation ................................................................................................................................... 42 Torque Test ............................................................................................................................................. 42 RPM Test ................................................................................................................................................. 43 Hardness Testing ..................................................................................................................................... 45 Final Product ............................................................................................................................................... 47 Conclusion ............................................................................................................................................... 49 Maintenance Program ............................................................................................................................ 51 Risk Assessment ...................................................................................................................................... 52 Project Management .................................................................................................................................. 53 Things We Learned/Life Long Learning ....................................................................................................... 57 Standards Used in the Project .................................................................................................................... 59 Component Level Standards ................................................................................................................... 59 Special Thanks and Recognition .................................................................................................................. 61 References .................................................................................................................................................. 62 Appendix ..................................................................................................................................................... 63 Page | v List of Figures Figure 1 ‐ Impact Ratchet Example ............................................................................................................. 10 Figure 2 ‐ Impact Ratchet Exploded View ................................................................................................... 11 Figure 3 ‐ Air Turbine Components ............................................................................................................. 12 Figure 4 ‐ Pin and Clutch Impact Mechanism Components ........................................................................ 12 Figure 5 ‐ Ratchet Head Components ......................................................................................................... 12 Figure 6 ‐ Conventional Air Ratchet ............................................................................................................ 13 Figure 7 ‐ Standard Ratchet and Socket ...................................................................................................... 14 Figure 8 ‐ Standard Socket Depth Limitation .............................................................................................. 14 Figure 9 ‐ Pass‐Thru Ratchet and Pass‐Thru Socket .................................................................................... 15 Figure 10 ‐ Pass‐Thru Socket Infinite Depth ................................................................................................ 15 Figure 11 ‐