Paper towel dispenser
From DDL Wiki
(→FMEA Analysis) |
(→FMEA Analysis) |
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- | | 01 || Front Housing || Protects device from exterior ||Fractures|| | + | | 01 || Front Housing || Protects device from exterior ||Fractures, Warped|| |
*Exposure of internal components | *Exposure of internal components | ||
*Possible injury to customer | *Possible injury to customer | ||
Line 214: | Line 214: | ||
||6|| | ||6|| | ||
* Improper handling | * Improper handling | ||
- | |||
* Improper manufacturing | * Improper manufacturing | ||
* Incorrect design | * Incorrect design | ||
||3|| | ||3|| | ||
* Material selection | * Material selection | ||
- | * | + | * Mold design |
||2||36|| | ||2||36|| | ||
- | * Select a | + | * Select a flexible and elastic material |
||Assembly and Manufacturing | ||Assembly and Manufacturing | ||
|- | |- | ||
Line 230: | Line 229: | ||
*Possible injury to customer | *Possible injury to customer | ||
||7|| | ||7|| | ||
- | * Improper | + | * Improper handling |
* Poor upkeep | * Poor upkeep | ||
||6|| | ||6|| | ||
Line 247: | Line 246: | ||
*Malfunctioning of mechanical spindle | *Malfunctioning of mechanical spindle | ||
||3|| | ||3|| | ||
- | |||
* Fatigue | * Fatigue | ||
||2|| | ||2|| | ||
* Material selection | * Material selection | ||
- | * | + | * Improper assemblying |
||5|| 30|| | ||5|| 30|| | ||
* Select a stiffer material | * Select a stiffer material | ||
Line 261: | Line 259: | ||
*Malfunctioning of mechanical spindle | *Malfunctioning of mechanical spindle | ||
||3|| | ||3|| | ||
- | * Improper | + | * Improper handling |
* Fatigue | * Fatigue | ||
||2|| | ||2|| | ||
* Material selection | * Material selection | ||
- | * | + | * Improper assemblying |
||4 || 24|| | ||4 || 24|| | ||
* Select a stiffer material | * Select a stiffer material | ||
Line 276: | Line 274: | ||
* Unable to confine rotation direction of spindle | * Unable to confine rotation direction of spindle | ||
||3|| | ||3|| | ||
- | * Improper | + | * Improper handling |
* Fatigue | * Fatigue | ||
||2|| | ||2|| | ||
* Material selection | * Material selection | ||
+ | * Improper assemblying | ||
||4 || 24|| | ||4 || 24|| | ||
* Select a stiffer material | * Select a stiffer material | ||
Line 294: | Line 293: | ||
*Malfunctioning of mechanical spindle | *Malfunctioning of mechanical spindle | ||
||5|| | ||5|| | ||
- | *Improper | + | *Improper handling |
- | * | + | *Improper manufacturing |
||2|| | ||2|| | ||
*Material selection | *Material selection | ||
||2||20|| | ||2||20|| | ||
*Select a stiffer material | *Select a stiffer material | ||
- | || | + | || Manufacturing and Reliablity |
|- | |- | ||
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*Malfunctioning of mechanical spindle | *Malfunctioning of mechanical spindle | ||
||5|| | ||5|| | ||
- | *Improper | + | *Improper manufacturing |
- | * | + | *Improper assemblying |
||2|| | ||2|| | ||
*Material selection | *Material selection | ||
+ | *Mold design | ||
||3||30|| | ||3||30|| | ||
*Select a stiffer material | *Select a stiffer material | ||
Line 320: | Line 320: | ||
*Unable to adjust spring to a desired angle | *Unable to adjust spring to a desired angle | ||
||3|| | ||3|| | ||
- | *Improper | + | *Improper handling |
- | * | + | *Improper manufacturing |
||2|| | ||2|| | ||
*Material selection | *Material selection | ||
||2||12|| | ||2||12|| | ||
None | None | ||
- | || | + | || Manufacturing |
|- | |- | ||
Line 334: | Line 334: | ||
* User dissatisfaction | * User dissatisfaction | ||
||4|| | ||4|| | ||
- | *Improper | + | *Improper handling |
- | * | + | *Improper manufacturing |
- | || | + | ||3|| |
- | * | + | * Material selection |
- | ||1|| | + | ||1||12|| |
- | * | + | * Select a stiffer material |
- | || | + | || Manufacturing |
|- | |- | ||
Line 347: | Line 347: | ||
* User dissatisfaction | * User dissatisfaction | ||
||2|| | ||2|| | ||
- | *Improper | + | *Improper assemblying |
- | * | + | *Improper manufacturing |
||2|| | ||2|| | ||
* | * |
Revision as of 00:47, 20 September 2009
Contents |
Executive Summary
Stakeholders
There are six major stakeholders with regards to the paper towel dispenser: Manufacturer, retailer, customer, user, society. The main needs for the manufacturer are to reduce cost and create a reliable product. For the retailer, it is being able to sell a quality product. For the customer, it is making sure it is an affordable and reliable machine. For the customer, cleanliness and ease of use are paramount. For the maintenance worker, ease of opening and replacing the paper towel are important. Society plays a role with regards to how the use of paper towel affects the ecosystem and earth in general. Listed below are the stakeholders and their respective needs.
Paper Towel Manufacturer
- Material cost
- Manufacturing cost
- Assembly
- Transporting
- Standardize/minimize parts
Retailer
- Cost
- Storage
- Reliability
- Usability
- Transporting
Customer
- Cost
- Mounting
- Ease of use
- Reliability
- Aesthetics
- Safety
User
- Ease of use / ergonomics
- Speed of operation
- Aesthetics
- Cleanliness
- Safety
Maintenance Worker
- Ease of towel replacement
- Safety
Society
- Environment
Usability Study
Assembly Pictures
How it Works
Mechanical Analysis
Parts List
DFMA Analysis
Design For Manufacture
Design For Assembly
FMEA Analysis
Part No. | Name | Function | Failure Mode | Effects of Failure | S | Causes of Failure | O | Design Controls | D | RPN | Recommended Actions | Responsibility |
---|---|---|---|---|---|---|---|---|---|---|---|---|
01 | Front Housing | Protects device from exterior | Fractures, Warped |
| 7 |
| 4 |
| 2 | 56 |
| Reliability
|
02 | Front Housing Clip | Holds housings together | Bends |
| 4 |
| 2 |
| 6 | 48 |
| Assembly and Reliablity
|
03 | Front Housing Tab | Secures housing clip | Strips |
| 2 |
| 2 |
| 8 | 32 |
| Assembly
|
04 | Rear Housing | Holds mechanical components | Fractures |
| 7 |
| 4 |
| 9 | 252 |
| Reliability |
05 | Paper Towel Holding Arm | Holds paper towel roll | Bends |
| 6 |
| 3 |
| 2 | 36 |
| Assembly and Manufacturing |
08 | Screw Anchor | Holds screw in wall | Fractures |
| 7 |
| 6 |
| 8 | 336 |
| Reliablity |
09 | Paper Guide Tube | Guides paper towel to cutting cylinder | Failed |
| ||||||||
10 | Spring (uneven hooks) | Holds 09 in place | Deformed |
| 3 |
| 2 |
| 5 | 30 |
| Assembly and Reliablity |
11 | Spring (even hooks) | Holds lever to spindle housing | Deformed |
| 3 |
| 2 |
| 4 | 24 |
| Assembly and Reliablity |
14 | Locking Spring | Hides screw in turning wheel | Deformed |
| 3 |
| 2 |
| 4 | 24 |
| Assembly and Reliablity |
16 | Guide clips for 09 | Guides paper on 09 | text | text | ||||||||
18 | Lever Arm | Connects spring to spindle | Breaks |
| 5 |
| 2 |
| 2 | 20 |
| Manufacturing and Reliablity |
19 | Spring Connector | Connects two springs to lever arm | Breaks |
| 5 |
| 2 |
| 3 | 30 |
| Assembly and Reliablity |
20 | Rounded Spring Guide | Angles spring to desired measurement | Breaks |
| 3 |
| 2 |
| 2 | 12 |
None | Manufacturing |
21 | Thin Paper Guide | Guides paper out of device | Breaks |
| 4 |
| 3 |
| 1 | 12 |
| Manufacturing |
22 | Front Spindle Housing | Final housing before paper leaves device | Fractures |
| 2 |
| 2 |
| 1 | 4 |
| Assembly |
23 | Spindle Housing Back | Back of spindle housing | Fractures |
| 2 |
| 2 |
| 1 | 4 |
| Assembly |
24,25 | Spindle Housing (L,R) | Sides of spindle housing | Breaks |
| 5 |
| 1 |
| 1 | 5 |
| Assembly |
29 | White Teeth Guide/Arm | Guides cutting teeth in spindle | Breaks |
| 5 |
| 3 |
| 1 | 15 |
| Assembly and Manufacturing |
30 | Cutting Teeth | Back of spindle housing | Wears/Bends |
| 4 |
| 3 |
| 1 | 12 |
| Assembly |
31,32 | Spindle | Back of spindle housing | Warps/Breaks |
| 5 |
| 1 |
| 1 | 5 |
| Assembly and Manufacturing |
DFE Analysis
Team Member Roles
- Eric Totong:
- Chang Keun Jung:
- James Li-Yang Lee:
- Nishan Kulatilaka: