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Failure Mode and Effects Analysis

Failure Mode and Effects Analysis (FMEA) is a crucial tool in determining if a particular component in a system will fail (in terms of the customer's requirements). By looking at each piece, we can rate the severity of a failure (S), the probability that it will occur (P), and the likelihood that the customer would detect the failure (D). The severity of failure is rated between 1-10, 1 being the effect is not noticed by the consumer, while 10 is hazardous. Probability of occurence is also rated from 1-10, 1 being extremely remote while 10 has an extremely high chance of occurring. Finally, detection is rated from 1-10 with 1 being almost certain to detect and 10 being no chance of detection whatsoever. With these three factors, we can multiply them together to achieve a total risk priority number (RPN) which can range from 1-1000 (1000 being the greatest risk). Below is a table outlining each part.

Fender Bridge FMEA

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Part & Function	Failure Mode	Effect of failure	Causes of failure	Detection	S	O	D	RPN	Action	S	O	D	RPN
(G1) Back Panel/ Pickguard Screws Fastener for back panel	Stripped Screw	Lodged Screw	*Wrong Screwdriver *Over tightening of screw	Stuck Screw	3	3	2	18	Advise user of possibility of stripped screws	3	2	2	12
(G2) Back Panel Protects Rear Bridge Mount and Springs	Brittle Fracture	Exposed Springs and rear bridge	*Dropping on a hard surface and/or a great height	Broken Plastic Pieces	4	5	1	20	Replace plastic material with something more robust like steel or aluminum	4	3	1	12
(G3) Strings
(G4) Springs
(G5) Whammy Bar
(G6) Bridge Mounting Screws
(G7) Bridge Assembly
(G8) Spring Claw
(G9) Spring Claw Screws
(G10) Saddle Plate
(G11) Saddle Spring}
(G12) Saddle Screw
(G13) Neck
(G14) Neck Mounting Plate
(G15) Bridge Block
(G16) Bridge Block Mounting Screws
(G17) Guitar Body
(G18) Bridge Plate

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Description		Standard Toaster	Clear Wall Toaster	Fold Out Toaster	Enclosed Toaster	Front Load Toaster
Sketch
Criteria	Weight	Datum 1	Design 1	Design 2	Design 3	Design 4