Folding Desk Chair Innovation
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Failure Mode Effects Analysis was the largest and most important aspect of the Design Aspect facet. | Failure Mode Effects Analysis was the largest and most important aspect of the Design Aspect facet. | ||
===DFE=== | ===DFE=== | ||
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| + | To further analyze the competitiveness of our design solution, we conducted an economic input-output life cycle analysis of our product. Once again, after initial analysis, we found that the majority of the environmental impact of our product is the result of the production and manufacturing phase. Thus we chose several sectors that best represented our product. Once again we had the retail price of the chair. For the pricing of the additional new parts we either used resources such as McMaster-Carr or custompart.net to estimate a cost. Using all this data we ran a new EIO-LCA the results of which can seen below. | ||
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| + | Once again, we found that the total CO2 tax would be less than 2% of the cost of the product. Not only is this insignificant in terms of our current product, but it is also about the same as our original folding chair, meaning that it is equivalent to what is on the market today. | ||
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Revision as of 18:55, 2 May 2012
Contents |
Executive Summary
Market Analysis
Design Documentation
Bill of Materials
| Part # | Part Name | QTY | Weight (g) | Function | Manufacturing | Material | Image |
|---|---|---|---|---|---|---|---|
| 1 | Folding Chair | 1 | Provides user with comfort and support. | Purchased from McMaster-Carr, part # 4821T3 | steel | ||
| 22 | Turntable | 1 | Attaches desk surface to table support and allows desk to rotate 90 degrees for folding. | Purchased from McMaster-Carr, part # 1797K3 | Steel | ||
| 23 | Desk Arm | 1 | Attaches desk to chair and rotates between open and closed position. | Bent pipe | Steel | ||
| 24 | Hinge Top | 1 | Allows table to open up for folding. | Stamping and folding. | Steel | ||
| 25 | Hinge Bottom | 1 | Allows table to open up for folding. | Stamping and folding. | Steel | ||
| 26 | Table Support | 1 | Attaches hinge to desk surface. | Cutting. | Aluminum | ||
| 27 | Desk top | 1 | Serves as a desk surface. | Injection Molding | HDPE | ||
| 28 | Links | 2 | Stops the desk arm at the appropriate angle. | Cutting and stamping. | Aluminum |
House of Quality
Design Analysis
DFMA
Design for Manufacture and Assembly considerations were significant to the prototype and design analysis. As the DFMA implications are expanded to the large scale production regime, several conclusions become apparent. If implemented on a large scale, the folding desk chair would be composed of two major subassemblies: a stock folding chair (likely very similar to the black Target model used in our physical prototype), and the custom desk and arm assembly. This means that other than the simple variations made to the folding chair (holes to mount hardward) after assembly in its own factory, all DFMA considerations for this project lie in the desk, arm and hinge subassembly. Firstly, stock tubing is used to form the main pivot arm. In this and all cases, use of fastners is minimized by using as few parts as possible. In this example, bending stock tubing is the simplest way to make the custom pivot arm. Attaching the main arm to to the chair and hinge on each end is also done using DFMA considerations, by using rivets and spring pins rather than traditional fastners. This is because fastners such as rivets and pins are easier to install, cheaper, and their inherent drawback of permanency doesn't matter in our design. Once the chair is assembled, it need not be disassembled.
FMEA
Failure Mode Effects Analysis was the largest and most important aspect of the Design Aspect facet.
DFE
To further analyze the competitiveness of our design solution, we conducted an economic input-output life cycle analysis of our product. Once again, after initial analysis, we found that the majority of the environmental impact of our product is the result of the production and manufacturing phase. Thus we chose several sectors that best represented our product. Once again we had the retail price of the chair. For the pricing of the additional new parts we either used resources such as McMaster-Carr or custompart.net to estimate a cost. Using all this data we ran a new EIO-LCA the results of which can seen below.
Once again, we found that the total CO2 tax would be less than 2% of the cost of the product. Not only is this insignificant in terms of our current product, but it is also about the same as our original folding chair, meaning that it is equivalent to what is on the market today.
| Production | ||||
|---|---|---|---|---|
| Chair | Desk Arm | Hardware | Desk Surface | |
| Sector | 33712A Metal and other household unupholstered furniture | 332996 Fabricated pipe and pipe fitting manufacturing | 332500 Hardware manufacturing | 32619A Other plastics product manufacturing |
| MTCO2E per $1M | 613 | 796 | 600 | 748 |
| Unit | chair | arm | hardware | desk surface |
| Unit per lifetime | 1 | 1 | 1 | 1 |
| Cost per unit | $32.38 | $2.28 | $52 | $15.67 |
| Lifetime | $32.38 | $2.28 | $52 | $15.67 |
| Implied MTCO2E | 0.01984894 | 0.001797368 | 0.0312 | 0.011720412 |
| CO2 tax @$30/mt | $0.60 | $0.05 | $0.94 | $0.35 |
