From DDL Wiki

Revision as of 22:17, 31 January 2014

Executive Summary

Product Stakeholders

We identified the major stakeholders as consumers (individual connoisseurs and restaurants), retailers, manufacturers and distributors (transportation and shipping companies). Listed below are the stakeholders associated with a corkscrew wine opener and the product's aspects they need as well as the some additional aspects they want.

Consumers need a product that is easy to understand and use but they want something that is aesthetically pleasing and cheap to buy. Retailers also need an aesthetically pleasing product as they are easier to sell, and they need a product that has a high profit margin. They usually want a product with a high market demand to get customers to their doorstep (or website). Add-ons such as a foil cutter and a table mount make the product even more desirable. Manufacturers usually try to cut costs associated with production so their product needs to have a simple mechanism with few moving parts. Ideally they would want to make their product from low cost materials with a cost effective manufacturing process. Distributors are concerned with transportation and shipping so they need a durable product that won't get damaged in transit. They want the product to be as light as possible to reduce transportation costs.

Product Use Study

First the user cuts the foils with the foil cutter. Second the user pushes the main handle down and then grabs the bottleneck with the two others handles. Third the user pulls the main handle up in order to make the screw penetrate the bottle cork. Fourth, the user pushes the main handle down again in order to take the cork out of the bottle. Fifth, the user takes the corkscrew away from the bottle, presses the two handles together and pulls the main handle up again in order to release the cork from the screw. Finally, the user is ready to enjoy the bottle he just opened.

Mechanical Description

The main mechanical motion of the corkscrew is the translation-rotation of the screw (helicoidal motion). The translation motion comes from the rotation of the main handle. The link between those to components is a simple gear that transforms the rotation of the main handle into the vertical translation of the piece holding the screw. In order to lead the vertical motion of the screw, a metal cylinder moves up and down into a vertical hole. The screw moves through a joint in which a helicoidal track has been designed in order to ensure the rotation of the screw.

Failure Mode and Effects Analysis (FMEA)

|- |squeeze too hard || 7 || Fatigue, Loss of Power from Motor || 1 || Fatigue Testing of Fan || 1 || 7 || Choose Material to Meet Needs |- |rowspan="4"| USB - Provides Power || Disconnection || Loss of power to chill pad || 2 || Loose Port, Something Snags Cord || 7 || rowspan="4" | None || 1 || 14 || Entertain options for compact cord wrapping |- |Broken inner wires || Loss of functionality || 6 || Damage to cord || 2 || 3 || 36 || rowspan="2" | None (Out of Designer Control) |- |Bend on connector || Connector could break off inside laptop || 7 || Bumping Connector While Inside Port || 2 || 1 || 14 |- |Power diverted elsewhere || Lower performance of chill pad || 2 || Too Much Usage from Programs || 3 || 3 || 18 || Keep Software to Low Power Usage Specs |- |Casing - Protects fan || Fan blades break off || Laptop heats up || 6 || Dent/Other Defect Causes Fan to Collide with Casing || 1 || Tolerance Testing on Fan/Casing || 3 || 18 || Keep Injection Mold Simple to Avoid Defects |- |Motor - Drives Fan|| Fatigue || Stops rotating fan || 6 || Electrical Problem, Demagnetization || 1 || Cyclic Testing of Motor || 3 || 18 || Entertain Different Motor Configurations |- |rowspan="2"| Air Intake - Allows Air to Enter Through Bottom ||Allowance of More than Air to Get Through Fan||Lower fan performance, Possible damage fan|| 3 || Over-sized openings || 3 || Testing with Dust/Debris Under Chill Pad || 2 || 18 || Reduce Hole Size |- |Mechanism Holding USB Cord Breaks||No convenient storage of for USB Cord|| 3 || Broken(Yielded) Tabs|| 3 || Cyclic testing of tabs || 2 || 18 || Retractable USB Cord |- |Grill - Allows Air Through Top||Particles slipping through grill|| Possible damage to fan || 3 || Over-sized openings, Damaged grill || 2 || Strength testing of grill || 2 || 12 || Change Angle of Grill, or Use Different Cooling Method |- |Screws - Holds Assembly Together||Loosening|| Assembly falling apart || 4 || Overuse, Fatigue || 2 || Testing of regular use || 3 || 24 || None (Out of Designer Control) |- |Rubber stoppers - Stops the computer from slipping || Disconnects from grill || Laptop slips off chill pad || 4 || Overuse, designed too loosely || 3 || Load and cyclic testing on stoppers || 2 || 24 || Put stronger grips on rubber stopper or adhere them differently

|-

|Rubber spacers - Pushes apart the top and bottom cover || Rubber tears || Top and bottom are not tightly connected everywhere || 4 || Overuse, weak rubber material || 2 || Cyclic testing on the assembly with spacers || 4 || 32 || Add more support to lessen the load on each spacer

Table