Mechanical Design and Development - Lab 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 22, 2015 Table of Contents The Product design specification 3 Option 2: 5 Mousetrap - This mousetrap is the part where the power is generated during operation. It is decided by the team to manufacture this by steel having it bolted to a steel frame as shown below: 7 The Product design specification The product to be designed is 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. 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. Product Design Specification Performance, quality and reliability Specification for the Design 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 Carry a small lead weight. Service Specification for the Design The product will have Life span of 8 years of service with a annual maintenance Customer, cost costs less $50 avoidable by all customers Installation and maintenance easy to maintain annual maintenance Materials Use light weight materials Conceptual design This section outlines all of the different options available to solve the problem. Project would ideally like to see a minimum of 2 options including the option to retain the status quo. An option will be selected from the two with improvement since the aim is to design a product that will solve the problem. We intend to become creative by coming up with a device from the two options. This means we will improve the strongest option to create our project. Option 1: The system is the first designs related to motion which uses a Line that wraps around hold-down arm cause a movement of about of 5 metres that can are operated in the opposite directions. The mechanism is situated at centre while the other also rotates to make it work. The operation is controlled and moderated by adjusting the line. What must be stated here is the level of accuracy necessary in order to achieve this, due to the Line that wraps around hold-down arm created in the rod having to match identically to each other. If the rod is strong enough the system is very reasonable in terms of price, construction and operation. Its maintenance cost is less as well due to the inexpensive spare parts. It is shown below Option 2: This design uses the spring attached to the mousetrap powered energy type, with the swing lifting method. Selection Criteria In selecting which option s to use various factors are considered which include cost-benefit analysis, budget, High Reliability, Life span and High Safety. The table below clearly states its importance in terms of percentage as shown below: Table 1: Criteria Vs Weight Table Criteria Weight / % 10 20 30 40 Budget – 20% Cost –benefit analysis 15 % High Reliability – 20% Large Life Span – 15% High Safety – 25% Evaluation There are a number of values which can be selected ranging from either 1 to 5 or 1 to 10. For this project, the evaluation range taken s 1 to 5 which is represented as shown below: Table 1 Value and representation Value Representation 1 Very Poor 2 Poor 3 Average 4 Good 5 Very Good Table 2: Design Evaluation Criteria Designs Design 1 Design 2 Value W.V Value W.V Budget – 20% 2 40 2 40 Cost –benefit analysis – 20 % 3 60 3 60 High Reliability – 20% 4 80 2 40 Large Life Span – 15% 3 45 2 30 High Safety – 25% 5 125 3 75 Total Weighted Value 350 245 Design 1 is given priority because it has the highest score. Chosen Design It is necessary to choose the fastest, safest and more reliable system. When looking at the differences between the options, but the main areas of real innovation have been our understanding of safety. The use of such device comes with its own set of precautions, as the weight and height of the loads are far greater today than they were in ancient times. Detailed Design Stage In order to completely evaluate the working/performance of a device, various different variables and characteristics associated with the it need to be observed and analyzed. Therefore designing is very important in device as it allows components to assembled using proper dimensions. It will be designed in a manner that will take a shorter time to move safely. This is a multi-task activity because, the device will not only required to carry out one activity but many. However in order for carry the load easily, the system capability and characteristics of the materials plays. In designing the device three variables are involved weight, material straight and speed. Structure- There are completely four components the entire structure is divided into as shown below which are further described separately and they are Support frame, mousetrap flipper, and line for scratch prevention. Mousetrap - This mousetrap is the part where the power is generated during operation. It is decided by the team to manufacture this by steel having it bolted to a steel frame as shown below: Weight Calculations- It is important to know entire weight of this device and its corresponding components. Thus, with the help of standard steel rod available widely from various sources is used. As shown from the figure above, the rod is split into half due to symmetry and categorized into three individual components shown by the colour codes. The calculation will be done for each rod separately and then multiplied by a factor of 2 due to the symmetry mentioned earlier. Assumptions are always necessary to conduct many calculations and so the first assumption and type of beam being used is a 20 by 20 cm rod which has a mass of 40kg/m. 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. Line - In order to select the appropriate cable, it is important to analyze the breaking limit of the rope to measure its strength. Hence, the team has decided to go with the stainless steel cable numbers 6X37 Class which provides extra flexibility and corrosion resistant properties. Moreover, the larger the number of wires used, the more the flexibility leading to lower resistance to pressure and abrasion. Even though this cable is a bit expensive compared to others found in the market, it is found to be the most suitable and safest material one can use. This is very important because failure of this cable could lead to catastrophic events. The manufacturing techniques that will be employed to construct your device Design After carrying out visibility study we realized that the proposed project can manufacture if we provided necessary professionals as well as design a system that will incorporate mousetrap energy. The product will be manufactured locally in units of 500. We also had to convince the existing leaders that the project was good for the future as well as realistic. It also holds a promise of sustainability essentially because, of usage of energy mousetrap energy that is virtually pollution-free, creating a safer and healthier environment for subsequent generations to see. Read More