Mechanical Design and Development Project - Report Example

Running Head: Mechanical Design and Development Mechanical Design and Development Your full name Your ID no. Unit code and name Lecturer name Assignment August 24, 2015 Product definition and feasibility of initial concepts The Product design specification The main aim of project is to have a mousetrap powered elevator device that will be able to lift a payload up a free-standing pole and then drop the payload onto a shelf. This device should have the ability to safely perform its functions. This will be made possible by advanced and well designed mousetrap powered elevator device that will have the ability to deliver the payload from the bottom to top thus accomplishing it function. The device will be powered by an unmodified, single, off-the-shelf, snap-style mousetrap and the payload will consist of a small lead weight. The device will start from the ground and the shelf has a hole in order to clear the pole. This means that the device must be as far as its compatibility with efficiency and usage is concerned. Product Design Specification Performance, quality and reliability Specification for the Design Carry a small light weight. Easy Loading Disposable Soap Refills It will be long lasting and non- rusty lift a payload up a free-standing pole and then drop the payload onto a shelf Powered by an unmodified, single, off-the-shelf, snap-style mousetrap Service Specification for the Design- The product will have Life span of 10 years of service with annual maintenance. If these proper specifications are followed, it will lead to improved working efficiency and minimized weight. Inspection of support structures, mousetrap and flipper systems should be periodically inspected and repaired. For any mousetrap powered elevator device to be successful in compatibility with the shelf where it is used, the design and modeling takes into account that it can withstand various stress during it use. The purpose is to make sure the mousetrap powered elevator device is able to perform their duties properly. This will help in coming up with standards which guide in planning preventive and maintenance of the mousetrap powered elevator device. Customer Need, Initial Design and Performance Criteria -For the product to fulfil its purpose, it must satisfy the customer expectations. It must be a more efficient in payload lifting than manual. An unassisted push elevator device would not likely meet this need. Many customers would be unlikely to use available push elevator device as they would not view it as making their lives any easier. The mousetrap powered elevator device must also be simple and safe to operate even for a novice user. This may be because of either perceived or real difficulty in mastering its controls, which for the most part, are quite unlike any other elevator. Installation and maintenance – the elevator should be easy to maintain as well as install. Materials - In order to design strong mousetrap powered elevator device design, the following specifications for materials will be necessary. The specifications specifically considered modulus elasticity, yield strength, ultimate tensile strength, corrosion resistance and elongation of materials. The materials should have light weight materials Conceptual design This was the most interesting part of the design process, various conceptual designs outlines were considered with the intention of solving the problem. Options were looked into and there benefits were evaluated. However, only two options were considered in this project and one was selected and an improvement was proposed. The mousetrap powered elevator device will require a sub-system that will be stable. The system will be stable if it has mousetrap power is stable. This leads to avoidance of serious failures. Option 1: This elevator device has traction drum arrangement and a motor installed at the top for easy distribution of power for load lifting. When there is a load to carry the motor supplies power. This is built to accommodate different internal distances, depending on the size of the shelf concerned, it therefore has modified distances but maximum is 5m. The entire structure has to be modified to accommodate winches or line. The winches are fitted with parallel grooved drums and a splash lubricated. The winch options available depend on the length the shelf needs. This is shown below; Front view Side view The elevator mechanism is situated at ‘D’ while payload moves BD in the vertical rod. The operation is controlled and moderated by adjusting the line at ‘AD’ with the pulley’s at ‘A’ and ‘D’. What must be stated here is the level of accuracy necessary in order to achieve this, due to the dowels and holes created in the drum having to match identically to each other. It is shown below Option 2: This the second option of the mousetrap powered elevator device. It has a rod for sliding upward and Line or winch that will wraps around hold-down arm and cause a movement. The mechanism is situated at centre while the other also rotates to make it work. This design uses the spring attached to the mousetrap powered energy type, with the swing lifting method. Evaluation of the options and selection The following are selecting criteria for options and factors that are onsidered which include Safety, reliability, cost-benefit analysis, Life span and Improvement of the existing conditions. The table below clearly states its importance: Service Specification for Design No. Need Importance 1 Safe device 5 2 Reliable 5 3 Cost –benefit analysis 3 4 Life Span 5 5 Improvement of the existing conditions 4 Table 2 shows the design condition specifications for the design. Table 2: Operating Conditions Specification for the Design Project Introduction Units Importance Safety of using the device Safety 5 The total cost of manufacture AUD 4 Cost of getting the human resources and labor 2 people 5 Construction time 3 days 3 Mobility Time spend on one payload 5 The table above shows that our design contain many thing its effective, simple, will not cost a lot of money easy to use. Table 1: Design Evaluation Criteria Designs Design 1 Design 2 Value total Value tota Safe device-5 5 25 5 25 Cost –benefit analysis – 3 4 12 5 15 Reliability – 5 4 20 5 25 Life Span – 5 5 25 5 25 Improvement of the existing conditions – 5 3 15 4 20 Total Weighted Value 97 110 From the above design 2 will be taken to detailed Design and production made due to highest score from the evaluation criteria above. Detailed Design Stage The proposed mousetrap powered elevator device will shown below; The proposed mousetrap powered elevator device has Mousetrap - This is responsible for generating power that will operate the elevator. If this doe not work properly its purpose will not be achieved. This is shown below; Line/ winch - this is the cable that is used to wraps around hold-down arm and cause a movement. this is a strong winch and has a certain breaking limit. In this case will use copper cable which provides extra flexibility and corrosion resistant properties. This is shown below : Rod and flipper : the rod is able provide a free-standing pole and then drop the payload onto a shelf. This is shown below; Since the load is first placed on bottom and then this line wraps comes sliding up to allow it to exit or vice versa in the condition of device, it is necessary to analyze this path to avoid any mistakes as well as to maintain high standards of safety. As shown by the figure, there is one straight path. The manufacturing techniques that will be employed to construct your device Design After feasibility study, concept design and detailed design the next stage is production and distribution to the market. The frame of the mousetrap powered elevator device is to be constructed from tubular steel with welded joints. To reduce the complexity of the design, all but three tubular members are completely straight and all are of circular cross section. The manufacturing of user-friendly and non-invasive mousetrap powered elevator device has been stressed.. The Manufacturing cost increased reduced thus the number of components for assembly activities should be increased to breakeven. The ability of the material not breaking easily can result in increasing the bearing strength and can be good for the durability by increasing the in service life under fatigue loads. At first 500units will be produced and marketed. References Eisner, H., 2008. Essentials of Project and Systems Engineering Management. Hoboken, N.J.: John Wiley & Sons. Dym, C. L. & Little, P., 1999. Engineering Design: A Project-Based Introduction, John Wiley, New York. Hyman, B., 1999. Fundamental of Engineering Design. New Jersey: Prentice Hall, Lumsdaine, E., Lumsdaine, M. & Shelnutt, J. W., 2008 Creative Problem Solving and Engineering Design. New York: McGraw-Hill, Inc.. Read More