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*
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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
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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
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Mixing Arm
- Plastic piece that mixes the contents of the bowl
| 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
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