Ice cream maker
From DDL Wiki
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Revision as of 14:52, 23 September 2007
part number | part name | part image |
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001 | cell 1,1 | cell 1,2 |
002 | cell 2,1 | cell 2,2 |
003 | cell 1,1 | cell 1,2 |
004 | cell 1,1 | cell 1,2 |
005 | cell 1,1 | cell 1,2 |
006 | cell 1,1 | cell 1,2 |
007 | cell 1,1 | cell 1,2 |
008 | cell 1,1 | cell 1,2 |
009 | cell 1,1 | cell 1,2 |
010 | cell 1,1 | cell 1,2 |
011 | cell 1,1 | cell 1,2 |
012 | cell 1,1 | cell 1,2 |
013 | cell 1,1 | cell 1,2 |
014 | cell 1,1 | cell 1,2 |
015 | cell 1,1 | cell 1,2 |
016 | cell 1,1 | cell 1,2 |
017 | cell 1,1 | cell 1,2 |
018 | cell 1,1 | cell 1,2 |
019 | cell 1,1 | cell 1,2 |
020 | cell 1,1 | cell 1,2 |
021 | cell 1,1 | cell 1,2 |
022 | cell 1,1 | cell 1,2 |
023 | cell 1,1 | cell 1,2 |
024 | cell 1,1 | cell 1,2 |
025 | cell 1,1 | cell 1,2 |
026 | cell 1,1 | cell 1,2 |
027 | cell 1,1 | cell 1,2 |
028 | cell 1,1 | cell 1,2 |
Item & Function | Failure Mode | Effects of Failure | S | Causes of Failure | O | Design Controls | D | RPN | Recommended Actions | Responsibility & Deadline | Actions Taken | S* | O* | D* | RPN* |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Motor
| Electrical failures: Motor may overheat and fail | Product will not mix the ice cream, and the product may not have good consistency. | 8 | Motor may overheat when the ice cream starts solidifying. The increased viscosity of the ice cream may add too much torque on the motor. | 6 | Testing with different types of ice cream and find the point when the load applied is too high | 3 | 124 | Find a controller that will turn off the motor once the torque applied to the motor gets too high | Motor Manufacturer | Integrate a current sensor into the design | 8 | 1 | 3 | 24 |
Mechanical Failure: Gear train may strip | The rotation of the motor will not be transferred to the product | 8 | The increased friction in between the separate gears can cause the gears to strip | 2 | Testing the durability of the gears | 3 | 48 | Test different materials to find the most cost-effective solution | Gear Manufacturer | N/A | 8 | 2 | 3 | 48 | |
Mixing Arm
| Mixing arm breaks/fails | Contents of the bowl will not be properly mixed to form a consistent product. | 4 | The increased viscosity of the product may cause the mixing arm to break. | 3 | Test to see the breaking point of the mixing arm. | 1 | 12 | Test different materials to find the most cost-effective solution | Manufacturer | N/A | 4 | 3 | 1 | 12 |
Wiring
| Current does not get transferred from the power outlet to the motor | Motor will not rotate the bowl, so contents of bowl will not get mixed. | 4 | The increased viscosity of the product may cause the mixing arm to break. | 2 | Before final assembly of the product, test connection points to see if all wiring points are valid | 3 | 24 | Install a station in the assembly process to make sure that all wiring connections are good | Assemblerer | N/A | 4 | 2 | 3 | 24
|
Switch
| Switch does not allow current to pass through | Motor will not rotate the bowl, so contents of bowl will not get mixed. | 4 | The switch connection may not contact the part that is used to close the circuit | 2 | Test to see if connection points are durable after many clicks (turn on and off many times) | 3 | 24 | Test a switch for 1,000 times to see if the switch operates properly each time | Assemblerer | N/A | 4 | 2 | 3 | 24 |