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MANE-4040 MECHANICAL SYSTEMS LABORATORY (MSL) Lab Report Cover Sheet Title of Lab: Gear Assembly Testing________________________ Section M, W(am), W(pm), Th: 4 (Thursday)_________________________________ Group ID (A, B, C, D, E): _E _________________________________________ Submitted by Group Leader: _Carl C. Hansen ______________________________ Group Member: 1 _Adam Larouche__________ Group Member: 2 _Carl Hansen _____________ Group Member: 3 _Dan Garr ________________ Group Member: 4 _Matt Wilcox _____________ Group Member: 5 _Samuel Harrington ________ Lab Scheduled Date: _1/31/2008 ________________ Lab Report Due Date: _2/21/2008 ________________ Lab report Received Date (by TA): _________________________ Late Penalty Points (by TA): _________________________ Section Possible Points Points Given Abstract 10 Introduction 10 Experimental Procedures 15 Results 25 Discussion of Results 25 Conclusions 15 Total 100
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MANE 4040-4: Mechanical Systems Lab, Spring 2008 Group E – 1 of 9 – I. Abstract: Spur gear assemblies allow for a basic analysis of gear geometry, kinematics, and kinetics. This report will describe experiments used to make calculations and conclusions about gear assemblies. The results include measurements of gear geometry and the relationships between meshing gears, and calculations of gear assembly starting torques and efficiencies. Also included in the results, is information related to kinematics of meshing gears and angular velocities among the gears. The discussion of these results will relate to the final calculated relative angular velocities and starting torques and how these obtained values related to predictions and mathematical explanations of gear assemblies. II. Introduction: The premise of this lab is an exploration and analysis of a moderately simple gear system. Experiments related to relative angular velocities between gears, relative torques, and power measurements and calculations are topics of interest. The gear apparatus will allow for an analysis of the four major aspects of gear trains: gear geometry, kinematics, backlash, and kinetics. The two words kinematics and kinetics are used widely, and the distinction is important. Kinematics is the analysis of the mathematical aspects of motion regardless of what causes the motion. Kinetics, however, is the analysis of the forces causing this motion, as well as momentum and energy that result. Spur gears are amongst the most efficient and effective means of torque transmission. Their design allows for minimal friction between interacting teeth, and their relatively high efficiency makes them a strong candidate for use in this lab. The most fundamental defining characteristic of a gear is its pitch circle. This is the circle that can be drawn over the face of the gear that represents the effective range of motive influence of the gear. This pitch circle has a pitch diameter, which is a more easily measured aspect of a given gear. Also pertinent to a gear’s geometry is the circular pitch, which is the arc length of the pitch
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