Mechanism Development Report (MDR). Mechanism Development Report (MDR). consists of a response to a design brief for a simple mechanism to the extent of about 1500 words plus diagrams, graphics, tables, materials lists etc.
-. Green Kitchens Inc. (USA) produce a range of equipment for the environmentally-conscious which use no electrical power. Their latest idea is for a bread-mixing device for the busy home-maker which is capable of producing 3Kg of bread-dough in a single batch so as to maximise the use of oven heat to produce several loaves. They have noted that electrical devices capable of such a feat require a 350W motor, although perhaps environmentalist users would tolerate a longer process using an equivalent of 200W. Design a heavy-duty manual dough mixer for this client.
. Structure of your Mechanism Development Report Following is a suggested structure for your MDR. It is a 10-point plan, so to speak, but the sections are not mandatory and you may choose to modify the mode of reporting as appropriate, and bearing in mind the forgoing instructions.The figures in square brackets give an indicative mark weighting for these aspects of the MDR. Choose one of the challenges 1-6 above and then: 1. Developing the Brief Expand on the brief by researching more about the particular context of the mechanism; find out more about the scope of such devices; what are the requirements of users? What do they expect the mechanism to do? How long should it last? What other devices are available which affect the user’s expectations? What performance data can you find out about them? Are there any constraints on the design of such devices, such as special regulations or health and safety considerations? Ethical issues? [10%] 2. Mechanical Analysis Investigate the basic physics and mechanics of the system requirements. Given that mechanisms transfer energy or power by translation or rotation of components, what can you figure out about the forces or torques involved? Do these dictate any particular dimensional constraints in order to derive a mechanical advantage? Remember the safe lifting limit for average humans is deemed to be about 250N, and therefore it is unlikely that human powered devices can involve greater efforts than that. [15%] 3. Concept Design Based on the information derived in 1 and 2 above, generate a working concept for your machine; this is likely to be best achieved graphically by sketching, although sometimes crude physical modelling can be helpful using simple materials such as card and tape, in order to help develop 3 dimensional space models and understand the disposition and interaction of components. Such 2- and 3-D modelling will often spawn new ideas and improvements to concepts. Use of 3D CAD modelling is welcome though not mandatory.[20%] 4. Subsystem Interaction Consider your mechanism as a set of subsystems. Are there alignment issues between components? Can smooth operation or reliability be influenced by such issues? If so, can these sub-system interfaces be enhanced (for example by the use of flexible couplings). It is a general rule that many of the failures in mechanical systems occur at the interfaces of sub-systems. [10%] 5. Component Search and Selection Having formulated an idea of what your design looks like (a so-called embodiment design), try to identify standard components which can be incorporated into your system. This task has been made infinitely easier by the existence of on-line search engines and catalogues of components hosted by specialist suppliers. Even “one stop shop” sites such as EBay or Amazon have their uses. A second line of general suppliers is the like of Farnell and RS Components. Beyond that there are numerous more focused traders in the field of bearings and spur gears, for example. [10%] 6. Geometrical Stability Identify any holding or positional fixing issues; how will your parts be fixed in relation to each other? How will they be held securely? What fasteners or adhesives could you use? [5%] 7. Environmental Robustness Does your mechanism need an enclosure? Will the ingress of water, dirt or other contaminants from the environment affect it? Can these issues be solved by careful component selection (such as sealed bearing races for example). [10%] 8. Operational Reliability What materials should you use in order to give your mechanism the expected strength, operational lifetime, and reliability. (Remember a one year operational lifetime is considered a minimum for most mechanisms)[10%] 9. Servicability Is your design easy to service or repair? If a component fails, is it easy to remove and replace? Can sub-systems be removed or does the whole thing have to be taken to bits? [5%] 10. Sustainability Issues What about disposal and recycling? Sustainable design is becoming increasingly important, and therefore low environmental impact materials, or those which can be reprocessed or otherwise re-used are to be favoured.[5%] Please note that standard components recommended by your report must be fully described with a reference to the source and any technical data which is pertinent to the operation of the mechanism.
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