Talk:Weed whacker
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| + | =Client Comments on Report= | ||
| + | We received your [http://ddl.me.cmu.edu/ddwiki/index.php?title=Weed_whacker&oldid=16670 report]. Your summary suggests that you have identified changes in the screws, shafts, axles, and plastic parts for improvement, but what changes specifically? Please spell out the main findings in the summary. | ||
| + | |||
| + | Detailed comments: | ||
| + | * Great list of stakeholder needs, but you seem to be missing a few such as easy to clean, easy to maintain, inexpensive to operate, etc. For such an awkward product, aren't shipping and storage important? | ||
| + | * Nice observation that the product need not only ''be'' safe, reliable and easy to use, but must also ''appear'' as such. | ||
| + | * Your description of system functions bring up questions - how does the trigger control fuel feed to the engine? Where are the spacers to which you refer? How does the reel feed additional wire? Pictures or figures would be a great help in understanding the way these mechanisms function. | ||
| + | * Please include a picture or drawing of the assembly with parts from the BOM labeled. What are your findings from the BOM? | ||
| + | * What holds the two axles together? | ||
| + | * Where and how are the bearings mounted? Your assembly picture may help show this. | ||
| + | * Is part 14 a subassembly or a single part? | ||
| + | * Where are the spacers in your BOM? | ||
| + | * What are your FMEA findings and conclusions? | ||
| + | * Your DFMA mentions five different kinds of screws - where are they shown? | ||
| + | * Your DFE is not clear - you include two tables but do not explain what you are doing. Please explain. | ||
| + | * Your mechanical analysis is not clear. Please be more explicit in explaining your model. How is the moment of inertia calculated at the 45 degree angle? Is the number you calculate good or bad? Please define all symbols and describe where your equations come from - your equations are difficult to follow. Is your scenario of 1 foot movement within 1 second reasonable? Why is the hand distance 10 inches? Is 19 lbs good or bad? How should we interpret your results? | ||
| + | |||
| + | We look forward to seeing your market research and new ideas in the next report. | ||
| + | |||
==Client comments on the Mechanical Analysis== | ==Client comments on the Mechanical Analysis== | ||
The mechanical analysis focuses on the weight balance of the weed whacker, which is important to the users. Here are few comments about the analysis: | The mechanical analysis focuses on the weight balance of the weed whacker, which is important to the users. Here are few comments about the analysis: | ||
Revision as of 19:59, 2 October 2008
Client Comments on Report
We received your report. Your summary suggests that you have identified changes in the screws, shafts, axles, and plastic parts for improvement, but what changes specifically? Please spell out the main findings in the summary.
Detailed comments:
- Great list of stakeholder needs, but you seem to be missing a few such as easy to clean, easy to maintain, inexpensive to operate, etc. For such an awkward product, aren't shipping and storage important?
- Nice observation that the product need not only be safe, reliable and easy to use, but must also appear as such.
- Your description of system functions bring up questions - how does the trigger control fuel feed to the engine? Where are the spacers to which you refer? How does the reel feed additional wire? Pictures or figures would be a great help in understanding the way these mechanisms function.
- Please include a picture or drawing of the assembly with parts from the BOM labeled. What are your findings from the BOM?
- What holds the two axles together?
- Where and how are the bearings mounted? Your assembly picture may help show this.
- Is part 14 a subassembly or a single part?
- Where are the spacers in your BOM?
- What are your FMEA findings and conclusions?
- Your DFMA mentions five different kinds of screws - where are they shown?
- Your DFE is not clear - you include two tables but do not explain what you are doing. Please explain.
- Your mechanical analysis is not clear. Please be more explicit in explaining your model. How is the moment of inertia calculated at the 45 degree angle? Is the number you calculate good or bad? Please define all symbols and describe where your equations come from - your equations are difficult to follow. Is your scenario of 1 foot movement within 1 second reasonable? Why is the hand distance 10 inches? Is 19 lbs good or bad? How should we interpret your results?
We look forward to seeing your market research and new ideas in the next report.
Client comments on the Mechanical Analysis
The mechanical analysis focuses on the weight balance of the weed whacker, which is important to the users. Here are few comments about the analysis:
- Apparently several assumptions have been made for your weight balance analysis. Please list them in an organized way.
- The weed whacker is designed to be used at an inclined angle. Thus the free body-diagram should be analyzed at that assumed angle, not in horizontal.
- Please revise the free-body diagram and indicate the meaning of each location, for example, engine, whacker disc and user’s hand-holding locations, etc. From the current diagram, it is difficult for reader to identify these locations.
- The calculation for the impulse is not clear. Please include a simple diagram for better explaining the concept. Also, please define the notations used in the equations, including theta and alpha.
