Paper towel dispenser
From DDL Wiki
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== DFMA Analysis == | == DFMA Analysis == | ||
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| - | + | === Design For Manufacture === | |
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| - | + | === Design For Assembly === | |
== FMEA Analysis== | == FMEA Analysis== | ||
Revision as of 16:24, 18 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
| Part No. | Name | Function | QTY | Weight | Material | Manufacturing Process | Image |
|---|---|---|---|---|---|---|---|
| 01 | Front Housing | Protects device from exterior | 1 | 935g | Plastic | Injection Molding | 
|
| 02 | Front Housing Clip | Holds housings together | 1 | 13g | Steel | Bending, Punching | 
|
| 03 | Front Housing Tab | Secures housing clip | 1 | <1g | Plastic | Injection Molding | 
|
| 04 | Rear Housing | Holds mechanical components | 1 | 986g | Plastic | Injection Molding | 
|
| 05 | Paper Towel Holding Arm | Holds paper towel roll | 2 | 40g each | Plastic | Injection Molding | 
|
| 06 | Phillips Head Screw (1/8 x 1/4 long) | Secures device to rear housing | 1 | 1g | Steel | Machined | 
|
| 07 | Wall Mounting Screw (1/8 x 1.25 long) | Secures housing to wall | 4 | 3.5g each | Steel | Machined | 
|
| 08 | Screw Anchor | Holds screw in wall | 4 | ~0.25g | Plastic | Injection molding | 
|
| 09 | Paper Guide Tube | Guides paper towel to cutting cylinder | 1 | 55g | Plastic | Injection molding | [[Image:| 100x100px]] |
| 10 | Spring (uneven hooks) | Holds 09 in place | 2 | 2g each | Metal | Extrusion | 
|
| 11 | Spring (even hooks) | Holds lever to spindle housing | 2 | 1.5g each | Metal | Extrusion | 
|
| 12 | Screw (3/32 x 5/8 long) | holds turning wheel and lever to spindle housing | 2 | ~1g each | Metal | Extrusion | 
|
| 13 | Red Screw Cap | Hides screw in turning wheel | 1 | <1g | Plastic | Injection molding | 
|
| 14 | Locking Spring | Ensures correct wheel spin direction | 1 | 4g | Steel | Extrusion | 
|
| 15 | Red Turning Wheel | Turns main spindle | 1 | 30g | Plastic | Injection molding | 
|
| 16 | Guide clips for 09 | Guides paper on 09 | 2 | 2.5g each | Plastic | Injection molding | [[Image:| 100x100px]] |
| 17 | Screw (3/32 x 3/8 long) | Holds lever assembly together and spindle housing | 2 | <1g each | Metal | Machined | 
|
| 18 | Lever Arm | Connects spring to spindle | 1 | 1g | Plastic | Injection molding | 
|
| 19 | Spring Connector | Connects two springs to lever arm | 1 | <1g | Plastic | Injection molding | 
|
| 20 | Rounded Spring Guide | Angles spring to desired measurement | 1 | <1g | Plastic | Injection molding | 
|
| 21 | Thin Paper Guide | Guides paper out of device | 1 | 24g | Plastic | Injection molding | 
|
| 22 | Front Spindle Housing | Final housing before paper leaves device | 1 | 132g | Plastic | Injection molding | 
|
| 23 | Spindle Housing Back | Back of spindle housing | 1 | 162g | Plastic | Injection molding | 
|
| 24 | Spindle Housing (L) | Left of spindle housing | 1 | 105g | Plastic | Injection molding | 
|
| 25 | Spindle Housing (R) | Right of spindle housing | 1 | 105g | Plastic | Injection molding | 
|
| 26 | White Spindle Guide | Holds spindle in line | 3 | 2.3g each | Plastic | Injection molding | 
|
| 27 | Screw (3/32 x 3/8 long) | Connects spindle halves | 2 | <1g | Metal | Machined | 
|
| 28 | Square nut | For use with 27 | 2 | <1g | Steel | Cast and drilled | 
|
| 29 | White Teeth Guide/Arm | Guides cutting teeth in spindle | 2 | 3g each | Plastic | Injection molding | 
|
| 30 | Cutting Teeth | Cuts paper towel | 1 | 75g | Steel | Cast, punched and bent | 
|
| 31 | Spindle Top Half | Holds cutting tool | 1 | 125g | Plastic | Injection molding | 
|
| 32 | Spindle Bottom Half | Holds cutting tool | 1 | 135g | Plastic | Injection molding | 
|
| 33 | Metal Key | Helps open housing | 1 | 5g | Steel | Punched | 
|
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 | Exposure of internal components Possible injury to user | ||||||||
| 02 | Front Housing Clip | Holds housings together | Breaks | Unable to attach housings together | ||||||||
| 03 | Front Housing Tab | Secures housing clip | Fractures | |||||||||
| 04 | Rear Housing | Holds mechanical components | Fractures | Unable to hold mechanical components | ||||||||
| 05 | Paper Towel Holding Arm | Holds paper towel roll | Bends | Unable to hold paper towel roll due to misaligned components | ||||||||
| 08 | Screw Anchor | Holds screw in wall | Fractures | Unable to hold mechanical components | ||||||||
| 09 | Paper Guide Tube | Guides paper towel to cutting cylinder | Failed | |||||||||
| 10 | Spring (uneven hooks) | Holds 09 in place | Breaks | Malfunctioning of mechanical spindle | text | |||||||
| 11 | Spring (even hooks) | Holds lever to spindle housing | Breaks | Malfunctioning of mechanical spindle | text | |||||||
| 14 | Locking Spring | Hides screw in turning wheel | Breaks | Unable to confine rotation direction of spindle | text | |||||||
| 16 | Guide clips for 09 | Guides paper on 09 | text | text | ||||||||
| 18 | Lever Arm | Connects spring to spindle | Malfunctioning of mechanical spindle | text | text | text | ||||||
| 19 | Spring Connector | Connects two springs to lever arm | Malfunctioning of mechanical spindle | |||||||||
| 20 | Rounded Spring Guide | Angles spring to desired measurement | ||||||||||
| 21 | Thin Paper Guide | Guides paper out of device | Paper ejected in inconsistent direction/ User dissatisfaction | |||||||||
| 22 | Front Spindle Housing | Final housing before paper leaves device | ||||||||||
| 23 | Spindle Housing Back | Back of spindle housing | ||||||||||
| 24,25 | Spindle Housing (L,R) | Sides of spindle housing | Breaks | Improper fit/ Unable to hold spindle | ||||||||
| 29 | White Teeth Guide/Arm | Guides cutting teeth in spindle | Bends/Breaks | Unable to cut papers/User dissatisfaction | ||||||||
| 30 | Cutting Teeth | Back of spindle housing | Wears/Breaks | |||||||||
| 31,32 | Spindle | Back of spindle housing |
DFE Analysis
Team Member Roles
- Eric Totong:
- Chang Keun Jung:
- James Li-Yang Lee:
- Nishan Kulatilaka:
