Doughnut maker
From DDL Wiki
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| Dispenser plunger moving at angle disrupting dough shaping | | Dispenser plunger moving at angle disrupting dough shaping | ||
| 6||Improper manufacturing || 2 || Inspecting dispenser support or dispenser plunger || 2 || 24 || Introduce quality control measures to ascertain dispenser quality||Manufacturing and Quality Control || None || 6 || 2 || 2 || 24 | | 6||Improper manufacturing || 2 || Inspecting dispenser support or dispenser plunger || 2 || 24 || Introduce quality control measures to ascertain dispenser quality||Manufacturing and Quality Control || None || 6 || 2 || 2 || 24 | ||
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| # || || # || || # || # || X||X|| None || # || # || # || # | | # || || # || || # || # || X||X|| None || # || # || # || # | ||
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|style="text-align: center;" | Improper handling || 2 ||style="text-align: center;" | Material Selection, Packaging || 2 || 32 ||style="text-align: center;" | Drop test with and without packaging ||style="text-align: center;" | Reliability||style="text-align: center;" |None||8||1||1||style="text-align: center;" |8 | |style="text-align: center;" | Improper handling || 2 ||style="text-align: center;" | Material Selection, Packaging || 2 || 32 ||style="text-align: center;" | Drop test with and without packaging ||style="text-align: center;" | Reliability||style="text-align: center;" |None||8||1||1||style="text-align: center;" |8 | ||
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+ | |- align="center" valign="center" | ||
+ | |008 | ||
+ | | "Dispenser motor" | ||
+ | *Drives the dispenser assembly | ||
+ | | | ||
+ | | | ||
+ | | # || || # || || # || # || X||X|| None || # || # || # || # | ||
+ | |||
+ | |- | ||
+ | |- align="center" valign="center" | ||
+ | |011 | ||
+ | | "Dispenser motor housing" | ||
+ | *Protects and positions the dispenser motor | ||
+ | | Fractured | ||
+ | | Motor is moved off position, disrupting dispensing process | ||
+ | | 7 ||Improper manufacturing || 1 || Material selection, placement|| 3 || 21 || Introduce quality control actions to check dispenser motor assembly||Reliability|| None || 7 || 1 || 3 || 21 | ||
+ | |||
+ | |- | ||
+ | |- align="center" valign="center" | ||
+ | |012 | ||
+ | | "Dispenser switch 1" | ||
+ | *Alerts motor to open plunger | ||
+ | | Sticking | ||
+ | | Plunger stays open, dough pours into oil tub | ||
+ | | 8 || Improper manufacturing or assembling|| 1 || Inspect control systems|| 5 || 40 || Take quality control actions or may redesign for extra clearance||Manufacturing|| None || 8 || 1 || 5 || 40 | ||
+ | |||
+ | |- | ||
+ | |- align="center" valign="center" | ||
+ | |013 | ||
+ | | "Dispenser switch 2" | ||
+ | Halts the dispensing process | ||
+ | | Sticking | ||
+ | | Plunger does not open, no dough released | ||
+ | | 8 || Improper manufacturing or assembling || 1 || Inspect contorl system|| 5 || 40 || Take quality control actions or may redesign for extra clearance ||Manufacturing|| None || 8 || 1 || 5 || 40 | ||
|} | |} | ||
Revision as of 00:04, 16 September 2009
Contents |
Executive Summary
Bill of Materials
Main Components
Additional Parts
Screws |
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Nuts and Washers |
Assembly Diagrams
Dough Dispenser Cup Assembly |
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Dispenser Motor and Conveyor Motor Assembly |
Dispenser Motor and Conveyor Motor Assembly Schematic |
Conveyor Belt Assembly |
Cooking Oil Assembly |
Exterior Panel Assembly |
Major Stakeholders and Needs
Usage and Usability
Mechanical Function
Design for Manufacturing and Assembly (DFMA)
Failure Modes and Effects Analysis (FMEA)
Part # | Item and Function | Failure Mode | Effects of Failure | S | Causes of Failure | O | Design Controls | D | RPN | Recommended Actions | Responsibility and Deadline | Actions Taken | S | O | D | RPN |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
001 | "Dispenser spring"
| Deformed spring (too long/short) | Unable to fully open/close causing incorrect dough dispensing | 7 | Improper manufacturing | 2 | Inspecting dispenser spring | 2 | 28 | Introduce quality control measures to ascertain accurate spring dimension | Manufacturing and Quality Control | None | 7 | 2 | 2 | 28 |
002 | "Dispenser support"
| Warped | Dispenser plunger moving at angle disrupting dough shaping | 6 | Improper manufacturing | 2 | Inspecting dispenser support or dispenser plunger | 2 | 24 | Introduce quality control measures to ascertain dispenser quality | Manufacturing and Quality Control | None | 6 | 2 | 2 | 24 |
003 | "Dispenser plunger"
| Cracked? | # | # | # | # | X | X | None | # | # | # | # | |||
005 | "Dispenser stop"
| Leaking or cracked | Dough seeps from dispenser cup to machine | 6 | Improper manufacturing | 3 | Inspect dispenser assembly for leaks | 3 | 54 | Introduce quality control measures to ascertain dispenser quality | Manufacturing and Quality Control | None | 6 | 3 | 3 | 54 |
006 | "Dispenser cup"
| Cracked | Dough seeps from dispenser cup to machine | 6 | Improper manufacturing | 3 | Inspect dispenser assembly for leaks | 2 | 36 | Introduce quality control measures to ascertain dispenser quality | Manufacturing and Quality Control | None | 6 | 3 | 2 | 36 |
007 | "Switch cover"
| Warped | Misalignment of components | 8 | Improper manufacturing | 1 | Specify process, Material selection | 1 | 8 | None | Manufacturing | None | 8 | 1 | 1 | 8 |
Fractured | Exposure / Misalignment of components | 8 | Improper handling | 2 | Material Selection, Packaging | 2 | 32 | Drop test with and without packaging | Reliability | None | 8 | 1 | 1 | 8 | ||
008 | "Dispenser motor"
| # | # | # | # | X | X | None | # | # | # | # | ||||
011 | "Dispenser motor housing"
| Fractured | Motor is moved off position, disrupting dispensing process | 7 | Improper manufacturing | 1 | Material selection, placement | 3 | 21 | Introduce quality control actions to check dispenser motor assembly | Reliability | None | 7 | 1 | 3 | 21 |
012 | "Dispenser switch 1"
| Sticking | Plunger stays open, dough pours into oil tub | 8 | Improper manufacturing or assembling | 1 | Inspect control systems | 5 | 40 | Take quality control actions or may redesign for extra clearance | Manufacturing | None | 8 | 1 | 5 | 40 |
013 | "Dispenser switch 2"
Halts the dispensing process | Sticking | Plunger does not open, no dough released | 8 | Improper manufacturing or assembling | 1 | Inspect contorl system | 5 | 40 | Take quality control actions or may redesign for extra clearance | Manufacturing | None | 8 | 1 | 5 | 40 |
Design for Environment (DFE)
Mechanical Analysis
Team Members & Roles
Michael Barako - DFE, Mechanical Analysis
Meng Yee Chuah - Mechanical Function
Katie McManus - Assembly Photos, DFMA
Sam Powers - Bill of Materials, FMEA
Sara Whitby - Executive Summary, Major Stakeholders, Usage and Usability