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	[[Ice cream maker DFE]]		[[Ice cream maker DFE]]
		+	[[How the product is used]]

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Revision as of 17:45, 23 September 2007

Component List

part number	part name	part image
001	cell 1,1
002	cell 2,1
003	cell 1,1
004	cell 1,1
005	cell 1,1
006	cell 1,1
007	cell 1,1
008	cell 1,1
009	cell 1,1
010	cell 1,1
011	cell 1,1
012	cell 1,1
013	cell 1,1
014	cell 1,1
015	cell 1,1
016	cell 1,1
017	cell 1,1
018	cell 1,1
019	cell 1,1
020	cell 1,1
021	cell 1,1
022	cell 1,1
023	cell 1,1

Failure Mode and Effects Analysis

This chart shows the top failure modes of the ice cream/sorbet maker. This is a risk assessment of the major parts of the device and how each failure ranks on a priority list. The failures are recorded in a few categories, which are severity, occurrence, and detection. The severity of the failure is a value that represents how crucial this part or action is to the usage of the product. The occurrence represents how often the failure occurs per 10,000 products. The detection represents how easily the failure mode can be detected, either in the assembly line process or by the user. Here is our FMEA of our ice cream maker. After the table, some of the values will be explained in further detail.

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 Powers the gear train	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 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
Wiring Transmits the current from the outlet to the device	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 allows the current to pass from the power source to the motor	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

Ice cream maker DFE How the product is used