https://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&feed=atom&action=historyStethoscope - Revision history2024-03-28T16:41:47ZRevision history for this page on the wikiMediaWiki 1.13.4https://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=32549&oldid=prevKleung@andrew.cmu.edu: /* Competitor Product Analysis (Report 1) */2012-02-25T21:39:52Z<p><span class="autocomment">Competitor Product Analysis (Report 1)</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[mailto:csunday@andrew.cmu.edu Cecily Sunday] (Photographer and Design for Assembly Specialist)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[mailto:csunday@andrew.cmu.edu Cecily Sunday] (Photographer and Design for Assembly Specialist)</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>= Competitor Product Analysis <del class="diffchange diffchange-inline">(Report 1)</del>=</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>= <ins class="diffchange diffchange-inline">Report 1 - </ins>Competitor Product Analysis=</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Executive Summary ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Executive Summary ==</div></td></tr>
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</table>Kleung@andrew.cmu.eduhttps://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=32548&oldid=prevKleung@andrew.cmu.edu at 21:39, 25 February 20122012-02-25T21:39:17Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[mailto:csunday@andrew.cmu.edu Cecily Sunday] (Photographer and Design for Assembly Specialist)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[mailto:csunday@andrew.cmu.edu Cecily Sunday] (Photographer and Design for Assembly Specialist)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">= Competitor Product Analysis (Report 1)=</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Executive Summary ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Executive Summary ==</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">= Competitor Product Analysis (Report 1)=</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Product History ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Product History ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The first stethoscope was invented in 1816 and it has been an essential tool in medical diagnostic methods ever since. René Laennec of France first came up with the idea of a stethoscope when he examined a patient using a stack of paper rolled into a cylinder. The first stethoscope was simply made of wood. In 1852, the design of a binaural stethoscope was introduced and the new prototype replaced wood with rubber making it more flexible and comfortable to use. In 1865, a more sophisticated stethoscope was designed with ivory, steel and wood. In 1870, the design of stethoscope became standardized as binaural and was manufactured with steel, rubber and cotton for quality and durability. In 1998, the modern binaural stethoscope was invented and manufactured using stainless steel, rubber, nylon and plastic.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The first stethoscope was invented in 1816 and it has been an essential tool in medical diagnostic methods ever since. René Laennec of France first came up with the idea of a stethoscope when he examined a patient using a stack of paper rolled into a cylinder. The first stethoscope was simply made of wood. In 1852, the design of a binaural stethoscope was introduced and the new prototype replaced wood with rubber making it more flexible and comfortable to use. In 1865, a more sophisticated stethoscope was designed with ivory, steel and wood. In 1870, the design of stethoscope became standardized as binaural and was manufactured with steel, rubber and cotton for quality and durability. In 1998, the modern binaural stethoscope was invented and manufactured using stainless steel, rubber, nylon and plastic.</div></td></tr>
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</table>Kleung@andrew.cmu.eduhttps://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=32270&oldid=prevKhchow@andrew.cmu.edu: /* Positive DFM Features */2012-02-13T17:11:36Z<p><span class="autocomment">Positive DFM Features</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># This design utilizes standardized ear-bud, washer, and screw components.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># This design utilizes standardized ear-bud, washer, and screw components.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The chestpiece and headset assemblies are connected and kept airtight using only the tension of the rubber tubes. This reduces the cost and complexity of the design by lowering part count and eliminating tight tolerances.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The chestpiece and headset assemblies are connected and kept airtight using only the tension of the rubber tubes. This reduces the cost and complexity of the design by lowering part count and eliminating tight tolerances.</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>#All parts that must be machined are made of stainless steel. All other components are made of easy to work with materials such as malleable metals and plastics.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># All parts that must be machined are made of stainless steel. All other components are made of easy to work with materials such as malleable metals and plastics<ins class="diffchange diffchange-inline">.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline"># Chestpiece has rough, finished surface inside of diaphragm, very different from other surfaces (possibly waterjet with particles, similar to shot peening). Possibly done for aesthetic reasons or for increased sound quality</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The color of the tubing, ear-buds, and diaphragms can be easily changed according to the customer's preferences</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The color of the tubing, ear-buds, and diaphragms can be easily changed according to the customer's preferences</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># None of the plastic components require secondary or finishing operations</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># None of the plastic components require secondary or finishing operations</div></td></tr>
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</table>Khchow@andrew.cmu.eduhttps://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=32269&oldid=prevKleung@andrew.cmu.edu: /* Bill of Materials */2012-02-13T14:26:26Z<p><span class="autocomment">Bill of Materials</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| Stainless Steel</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| Stainless Steel</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 10.273</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 10.273</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>| [[Image:<del class="diffchange diffchange-inline">stethoscope_lfdbase</del>.jpg|100px]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>| [[Image:<ins class="diffchange diffchange-inline">stethoscope_hfdbase</ins>.jpg|100px]]</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 8</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 8</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| Stainless Steel</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| Stainless Steel</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 20.177</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 20.177</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>| [[Image:<del class="diffchange diffchange-inline">stethoscope_hfdbase</del>.jpg|100px]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>| [[Image:<ins class="diffchange diffchange-inline">stethoscope_lfdbase</ins>.jpg|100px]]</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 11</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 11</div></td></tr>
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</table>Kleung@andrew.cmu.eduhttps://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=32075&oldid=prevKleung@andrew.cmu.edu: /* Group Information */2012-02-13T01:45:02Z<p><span class="autocomment">Group Information</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Group Information ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Group Information ==</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>'''24-441 Spring 2012, Group 3'''</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>'''24-441 Spring 2012, Group 3'''</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Resident [http://en.wikipedia.org/wiki/Hawaiian Hawaiian]: </del>[mailto:khchow@andrew.cmu.edu Kellen Chow] (Wiki Formatting and FMEA Specialist)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[mailto:khchow@andrew.cmu.edu Kellen Chow] (Wiki Formatting and FMEA Specialist)</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">[http://en.wikipedia.org/wiki/Paramedic Live-saving] Extraordinaire: </del>[mailto:jdivone@andrew.cmu.edu Jacob Divone] (Safety and Environmental Impact Specialist)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[mailto:jdivone@andrew.cmu.edu Jacob Divone] (Safety and Environmental Impact Specialist)</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Community [http://en.wikipedia.org/wiki/Vigilante Ass-Kicker (CA)]: </del>[mailto:kleung@andrew.cmu.edu KinHang Leung] (Team Leader and Manufacturing Specialist)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[mailto:kleung@andrew.cmu.edu KinHang Leung] (Team Leader and Manufacturing Specialist)</div></td></tr>
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<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">International [http://en.wikipedia.org/wiki/Secret_agent Covert Operative]: </del>[mailto:csunday@andrew.cmu.edu Cecily Sunday] (Photographer and Design for Assembly Specialist)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[mailto:csunday@andrew.cmu.edu Cecily Sunday] (Photographer and Design for Assembly Specialist)</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Executive Summary ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Executive Summary ==</div></td></tr>
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</table>Kleung@andrew.cmu.eduhttps://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=32006&oldid=prevCmsunday@andrew.cmu.edu: /* Design for Manufacturing and Assembly (DFMA) */2012-02-12T22:16:40Z<p><span class="autocomment">Design for Manufacturing and Assembly (DFMA)</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Design for Manufacturing and Assembly (DFMA)==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Design for Manufacturing and Assembly (DFMA)==</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">===Design for Manufacturing (DFM)===</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The competitor product embodies a number of positive designs decisions to minimize costs and complications during the manufacturing process. This is done by using standardized components wherever possible, selecting easy to work with materials, and optimizing the stethoscope’s functionality by while maintaining its simplicity. After completing the DFM analysis, the chestpiece proves to be the component with the most room for improvement because this piece has the greatest number of customized parts associated with it. Perhaps a single, size-changing diaphragm can be designed to eliminate the need for all sound-splitting components. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The competitor product embodies a number of positive designs decisions to minimize costs and complications during the manufacturing process. This is done by using standardized components wherever possible, selecting easy to work with materials, and optimizing the stethoscope’s functionality by while maintaining its simplicity. After completing the DFM analysis, the chestpiece proves to be the component with the most room for improvement because this piece has the greatest number of customized parts associated with it. Perhaps a single, size-changing diaphragm can be designed to eliminate the need for all sound-splitting components. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">=</del>===Positive DFM Features<del class="diffchange diffchange-inline">=</del>===</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">The simplicity in the design of the stethoscope translates into simplicity of assembly. The competitor product utilizes a low part count, sub-assemblies, and mistake-proof processing to optimize the stethoscope's assembly design. The simplicity in design makes issues associated with obstructed pathways, sequencing, and direction almost inapplicable to the assembly of this product. With the exception of the sound splitting components, the stethoscope can be fully disassembled by the user for cleaning and maintenance. Therefore, as with the stethoscope's DFM, the chestpiece shows the most room for improvement in terms of DFA.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>===Positive DFM Features===</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The stethoscope is not held together by any fasteners, lowering the part count.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The stethoscope is not held together by any fasteners, lowering the part count.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># This design utilizes standardized ear-bud, washer, and screw components.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># This design utilizes standardized ear-bud, washer, and screw components.</div></td></tr>
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<td colspan="2" class="diff-lineno">Line 376:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># None of the plastic components require secondary or finishing operations</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># None of the plastic components require secondary or finishing operations</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">=</del>===Suggested DFM Improvements<del class="diffchange diffchange-inline">=</del>===</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>===Suggested DFM Improvements===</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The part count can be further consolidated by using a single instead of a double air tube. This would also eliminate the need for the two tube clamps. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The part count can be further consolidated by using a single instead of a double air tube. This would also eliminate the need for the two tube clamps. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The chest piece should be simplified so that it requires less custom machining, moving parts, and tight tolerances. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The chest piece should be simplified so that it requires less custom machining, moving parts, and tight tolerances. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Different ear-buds can be selected that work to block out noise and improve comfort in addition to just transmitting sound. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Different ear-buds can be selected that work to block out noise and improve comfort in addition to just transmitting sound. </div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div># The diaphragm bases appear to be sand-blasted for aesthetics. This finishing operation can be eliminated to reduce manufacturing costs.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># The diaphragm bases appear to be sand-blasted for aesthetics. This finishing operation can be eliminated to reduce manufacturing costs. <ins class="diffchange diffchange-inline"> </ins></div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div> </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">===Design for Assembly (DFA)===</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">The simplicity in the design of the stethoscope translates into simplicity of assembly. The competitor product utilizes a low part count, sub-assemblies, and mistake-proof processing to optimize the stethoscope's assembly design. The simplicity in design makes issues associated with obstructed pathways, sequencing, and direction almost inapplicable to the assembly of this product. With the exception of the sound splitting components, the stethoscope can be fully disassembled by the user for cleaning and maintenance. Therefore, as with the stethoscope's DFM, the chestpiece shows the most room for improvement in terms of DFA. </del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">=</del>===Positive DFA Features<del class="diffchange diffchange-inline">=</del>===</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>===Positive DFA Features===</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The chestpiece is the only component that requires specific tools and sequencing during assembly. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The chestpiece is the only component that requires specific tools and sequencing during assembly. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The diaphragms, chestpiece, and headset are all sub-assemblies that can made and tested prior to the assembly of the final product.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The diaphragms, chestpiece, and headset are all sub-assemblies that can made and tested prior to the assembly of the final product.</div></td></tr>
<tr><td colspan="2" class="diff-lineno">Line 391:</td>
<td colspan="2" class="diff-lineno">Line 388:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The size, color, and simplicity of the diaphragms and headset allow for mistake-proof assembly. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The size, color, and simplicity of the diaphragms and headset allow for mistake-proof assembly. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">=</del>===Suggested DFA Improvements<del class="diffchange diffchange-inline">=</del>===</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>===Suggested DFA Improvements===</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Using a single air tube will eliminate the need to assemble the tube clamps. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Using a single air tube will eliminate the need to assemble the tube clamps. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The tub caps have no functional purpose and can be removed to simplify the assembly process. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The tub caps have no functional purpose and can be removed to simplify the assembly process. </div></td></tr>
<!-- diff generator: internal 2024-03-28 16:41:47 -->
</table>Cmsunday@andrew.cmu.eduhttps://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=32005&oldid=prevCmsunday@andrew.cmu.edu: /* Design for Assembly (DFA) */2012-02-12T22:14:27Z<p><span class="autocomment">Design for Assembly (DFA)</span></p>
<table style="background-color: white; color:black;">
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr valign='top'>
<td colspan='2' style="background-color: white; color:black;">←Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 22:14, 12 February 2012</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Design for Assembly (DFA)===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Design for Assembly (DFA)===</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>The simplicity in the design of the stethoscope translates into simplicity of assembly. The competitor product utilizes a low part count, sub-assemblies, and mistake-proof processing to optimize the stethoscope's assembly design. The simplicity in design makes issues associated with obstructed pathways, sequencing, and direction almost inapplicable to this product. With the exception of the sound splitting components, the stethoscope can be fully disassembled by the user for cleaning and maintenance. Therefore, as with the <del class="diffchange diffchange-inline">stethoscopes </del>DFM, the chestpiece <del class="diffchange diffchange-inline">and in particular the splitter leave </del>the most room for improvement in terms of <del class="diffchange diffchange-inline">design for assembly</del>. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The simplicity in the design of the stethoscope translates into simplicity of assembly. The competitor product utilizes a low part count, sub-assemblies, and mistake-proof processing to optimize the stethoscope's assembly design. The simplicity in design makes issues associated with obstructed pathways, sequencing, and direction almost inapplicable to <ins class="diffchange diffchange-inline">the assembly of </ins>this product. With the exception of the sound splitting components, the stethoscope can be fully disassembled by the user for cleaning and maintenance. Therefore, as with the <ins class="diffchange diffchange-inline">stethoscope's </ins>DFM, the chestpiece <ins class="diffchange diffchange-inline">shows </ins>the most room for improvement in terms of <ins class="diffchange diffchange-inline">DFA</ins>. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>====Positive DFA Features====</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>====Positive DFA Features====</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The chestpiece is the only component that requires specific tools and sequencing during assembly. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The chestpiece is the only component that requires specific tools and sequencing during assembly. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The diaphragms, chestpiece, and headset are all sub-assemblies that can made and tested prior to the assembly of the final product.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The diaphragms, chestpiece, and headset are all sub-assemblies that can made and tested prior to the assembly of the final product.</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div># With the exception of the splitter,all components are connected using threads, rubber tension, or light applied pressure.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># With the exception of the splitter,all components are connected using threads <ins class="diffchange diffchange-inline">and chamfers</ins>, rubber tension, <ins class="diffchange diffchange-inline">and/</ins>or light applied pressure.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The size, color, and simplicity of the diaphragms and headset allow for mistake-proof assembly. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The size, color, and simplicity of the diaphragms and headset allow for mistake-proof assembly. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>====Suggested DFA Improvements====</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>====Suggested DFA Improvements====</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Using a single air tube will eliminate the need to assemble the tube clamps. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># Using a single air tube will eliminate the need to assemble the tube clamps. </div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div># The tub caps have no functional purpose and can be removed to <del class="diffchange diffchange-inline">simply </del>the assembly process. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div># The tub caps have no functional purpose and can be removed to <ins class="diffchange diffchange-inline">simplify </ins>the assembly process. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The components in the chest piece must be well machined in order to be assembled properly. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The components in the chest piece must be well machined in order to be assembled properly. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The sequencing and direction of the parts within the splitter is slightly ambiguous and may result in improper assembly.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div># The sequencing and direction of the parts within the splitter is slightly ambiguous and may result in improper assembly.</div></td></tr>
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</table>Cmsunday@andrew.cmu.eduhttps://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=31978&oldid=prevCmsunday@andrew.cmu.edu: /* Design for Assembly (DFA) */2012-02-12T21:55:23Z<p><span class="autocomment">Design for Assembly (DFA)</span></p>
<table style="background-color: white; color:black;">
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr valign='top'>
<td colspan='2' style="background-color: white; color:black;">←Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 21:55, 12 February 2012</td>
</tr>
<tr><td colspan="2" class="diff-lineno">Line 383:</td>
<td colspan="2" class="diff-lineno">Line 383:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Design for Assembly (DFA)===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Design for Assembly (DFA)===</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>The simplicity in the design of the stethoscope translates into simplicity of assembly. The competitor product utilizes a low part count, sub-assemblies, and mistake-proof processing to optimize the stethoscope's assembly design. <del class="diffchange diffchange-inline"> </del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The simplicity in the design of the stethoscope translates into simplicity of assembly. The competitor product utilizes a low part count, sub-assemblies, and mistake-proof processing to optimize the stethoscope's assembly design. <ins class="diffchange diffchange-inline">The simplicity in design makes issues associated with obstructed pathways, sequencing, and direction almost inapplicable to this product. With the exception of the sound splitting components, the stethoscope can be fully disassembled by the user for cleaning and maintenance. Therefore, as with the stethoscopes DFM, the chestpiece and in particular the splitter leave the most room for improvement in terms of design for assembly. </ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>====Positive DFA Features====</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>====Positive DFA Features====</div></td></tr>
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</table>Cmsunday@andrew.cmu.eduhttps://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=31977&oldid=prevKhchow@andrew.cmu.edu: /* Project Executive Summary */2012-02-12T21:53:24Z<p><span class="autocomment">Project Executive Summary</span></p>
<table style="background-color: white; color:black;">
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
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<td colspan='2' style="background-color: white; color:black;">←Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 21:53, 12 February 2012</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Executive Summary ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Project Executive Summary ==</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>A stethoscope is a medical device used for listening to internal body sounds. Our team is assessing the usability of a stethoscope used for medical applications. We researched the history of the stethoscope design to help determine how the product works. We also dissected a competitor stethoscope to study the construction and materials used in the assembly. We conducted a preliminary user study to develop ideas for improvement as well as features to consider during product dissection.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>A stethoscope is a medical device used for listening to internal body sounds. Our team is assessing the usability of a stethoscope used for medical applications. We researched the history of the stethoscope design to help determine how the product works. We also dissected a competitor stethoscope to study the construction<ins class="diffchange diffchange-inline">, functionality </ins>and materials used in the assembly. We conducted a preliminary user study to develop ideas for improvement as well as features to consider during product dissection<ins class="diffchange diffchange-inline">. Finally, we performed a life-cycle analysis to determine the environmental impact of manufacturing a stethoscope</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Our group determined that the design of the competitor stethoscope was robust enough for daily use. We recommend reducing the number of parts, specifically by cutting the number of tubes from two to one. We also recommend that the chestpiece be single-sided rather than double sided to reduce the movement of parts. Finally, we determined that there is a need for cheaper customization for individual products. We determined that <del class="diffchange diffchange-inline">we could develop </del>several customized parts <del class="diffchange diffchange-inline">in different sizes and colors</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Our group determined that the design of the competitor stethoscope was robust enough for daily use <ins class="diffchange diffchange-inline">and nearly optimized for cheap manufacturing and low maintenance</ins>. We recommend reducing the number of parts, specifically by cutting the number of tubes from two to one. We also recommend that the chestpiece be single-sided rather than double sided to reduce the movement of parts. Finally, we determined that there is a need for cheaper customization for individual products<ins class="diffchange diffchange-inline">. Generic stethoscopes can be purchased for as low as $8.00, while customized stethoscopes can run over $300.00</ins>. We determined that <ins class="diffchange diffchange-inline">having </ins>several customized parts <ins class="diffchange diffchange-inline">that can be packaged with the stethoscope would allow for more individual customization with little extra cost to the consumer</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Stakeholders==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>==Stakeholders==</div></td></tr>
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</table>Khchow@andrew.cmu.eduhttps://wiki.ece.cmu.edu/ddl/index.php?title=Stethoscope&diff=31966&oldid=prevCmsunday@andrew.cmu.edu: /* Design for Assembly (DFA) */2012-02-12T21:20:22Z<p><span class="autocomment">Design for Assembly (DFA)</span></p>
<table style="background-color: white; color:black;">
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr valign='top'>
<td colspan='2' style="background-color: white; color:black;">←Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 21:20, 12 February 2012</td>
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<tr><td colspan="2" class="diff-lineno">Line 383:</td>
<td colspan="2" class="diff-lineno">Line 383:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Design for Assembly (DFA)===</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>===Design for Assembly (DFA)===</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">The simplicity in the design of the stethoscope translates into simplicity of assembly. The competitor product utilizes a low part count, sub-assemblies, and mistake-proof processing to optimize the stethoscope's assembly design. </ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>====Positive DFA Features====</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>====Positive DFA Features====</div></td></tr>
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</table>Cmsunday@andrew.cmu.edu