City Hotel Limited. City Hotel is a private compan Custom Essay Help

City Hotel Limited. City Hotel is a private compan Custom Essay Help

adjust: auto; -webkit-text-stroke-widt1Department of EngineeringASSESSMENT BRIEFModule Title: Mechanical DesignModule Code: 5ET008Component Number: 1 of 2Weighting: 50%Learning Outcomes to be assessed:LearningOutcome1US Underpinning Science and MathematicsUS3: Ability to apply and integrate knowledge and understanding of materials,processes, inspection and design disciplines to define manufacturing specifications andefficient and cost-effective manufacture.LearningOutcome2E Engineering AnalysisE2: To be ability to identify, classify and describe the performance of manufacturingdesign decisions through the use of systematic analysis, analysis and modellingtechniquesE3: To be competent in the use of commercial software packages to design, analyseand model mechanical design systems.LearningOutcome3D DesignD3: Identify and manage cost drivers that influence the choice of manufacturingprocesses.D6: Manage the design for manufacture process relevant to products and systems andevaluate outcomesLearningOutcome4P Engineering PracticeP6: Understanding of British and International standards appropriate to product designand manufactureP7: To be aware of the quality issues underpinning manufacturing design, eguncertainty, dimensional and geometric tolerances, surface finish.P8: To be aware of how uncertainty applies to manufacturing processes andmeasurement.Marking Criteria:See weightings of each requirementThe minimum pass mark for this element is DYou will pass the module if you achieve a minimum grade of D for this assignment and an average grade of D for the wholecomponent.Assignment handed out: 23rd November 2015 Latest date for submission: 19 Jan 2016Assignments submitted after the deadline and without an authorised extension of time will be marked F0.Please mark your assignment for the attention of: Jon RackleyYou should make it very clear what sources of information have been used; where material/information from these sources isquoted it must be clearly referenced using the Harvard Referencing System. (Details can be obtained from Learning Centres).The assignment must be handed in to Telford Student Registry, SA Block.You are advised to keep your own electronic & hard copy of any work submitted.25ET008 Mechanical Design Assignment 1 Tutor: Jon. RackleyBackground In order to set the scene for this assignment it may be useful to remind you of somedefinitions of the phrase Design for Manufacture : Design for manufacture = how the design of a piece-part or product isinfluenced/affected/constrained/limited by the manufacturing and assemblyproduction processes or the manufacturing system used. [Griffiths] or: Design for manufacture and assembly is attempting to foresee, at the productdesign stage, what the manufacturing problems will be and to quantify them sothat they can be corrected on the drawing board, rather than later, duringmanufacture. [Boothroyd and Dewhurst]The three-pin power Plug Figure 1 below shows a standard UK three-pin power plug. Considering the function, what does matter is that the three pins must assemble easily into the base. Assume that the plastic base is injection moulded and the brass pins are machined. Note that both the pins and the base will have tolerances associated with them. Figure 2 shows a schematic section of the plug base with a slot for one of the rectangular pins. The pin is inserted from above and protrudes below the bottom face ready for mating with the socket. The angular alignment of the pin is important to ensure easy and correct location into the socket. This angular alignment will be defined by a geometrical tolerance.plastic plug basebottom facetop facedirection ofpin insertionFigure 2Figure 13Assignment:Part A: Write an essay that includes: a) Explanation on DFM including: (30)?? A section explaining why at the design stage of a product, the cost expenditure may only be 20%, yet the committed cost could be as high as 80%. You should include a diagram to explain this. Relate this to thecomment throw it over the wall to be made .?? A section explaining the general principles of DfM.?? A section explaining the importance of Design for Manufacture (DfM). b) A review of a statistical method that helps in process control and capability. (10) c)A discussion on confidence in measurement. (10) The essay must be at least 1500 words long and must include diagrams, graphs or tables. The diagrams etc can be in addition to the words.Part B Define three types of surface finish standard and explain where each might be used. (15) There is another page to this assignmentPLEASE ENSURE YOU REFERENCE AND PLEASE UNDERSTAND ANYDIRECT REFERENCES MUST BE IN ITALICS AND BE LESS THAN 10% OFTHE DOCUMENT.4Part C A pulley is designed to fit on a 90mm diameter shaft with a medium drive fit. After a design review it is decided that a more positive drive transfer mechanism is required and a rectangular key is added. This results in a fit between the hole in the pulley and the shaft being changed to aclose running fit. a) Explain the changes in the tolerance of both shaft and hole, and give an indication of what this means to the manufacture of the parts. (15) b) Redraw figure 2 sketch of the plug (using either a CAD package or by hand) and add to this drawing the following information using the relevant ISO symbols:?? A geometrical tolerance box showing that the centre of the slot must be contained within a 50um diameter cylindrical tolerance zone which is perpendicular to the bottom face. This is a perpendicularity geometrical tolerance. (10)?? A dimension showing that the slot width is nominally 4mm with an h8tolerance. This tolerance is to be shown not by the designation h8 but in actual upper and lower tolerance values. (5)?? A surface finish tick mark showing that the root-mean squared roughness of the inside of the slot is to be a 5um as produced by the moulding process with no additional machining. (5)PLEASE ENSURE YOU REFERENCE AND PLEASE UNDERSTAND ANYDIRECT REFERENCES MUST BE IN ITALICS AND BE LESS THAN 10% OFTHE DOCUMENT.Jon Rackley


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