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Dear All,
Can you please clarify the occurrence rating method. There is no specific rule given how to see the rating is FMEA standard.
Example
If we consider:
From bottom to top occurance rating will be
<0.001 - 2,
0.001 to 0.01 - 3
0.01 to 0.1 - 4
0.1 to 0.5 - 5
0.5 to 2 - 6
2 to 10 - 7
10 to 20 - 8
20 to 50 - 9
50 to 100 ???? or
> 100 - 10
Top to bottom
> 100 - 10
100 to 50 - 9
50 to 20 - 8
20 to 10 - 7
10 to 2 - 6
2 to 0.5 - 5
0.5 to 0.1 - 4
0.1 to 0.01 - 3
0.01 to 0.001 ???? or
< 0.001 - 2
Questions:
1. If rejection is 30 per thousand what is the occurrence rating?? As per top to bottom its 8, as per bottom to top its 9, Whether it will be in 9 or 8?
2. While fixing occurrence we need to see from top to bottom or bottom to top?
3. If we considering rating from bottom to top, what is rating we need to give if rejection 50 to 100??
4 If we considering rating from top to bottom, what is rating we need to give if rejection 0.01 to 0.001??
Herewith I have attached the excel sheet. Please go through and clarify the questions mentioned.

Hari
Can you please clarify the occurrence rating method. There is no specific rule given how to see the rating is FMEA standard.
Example
If we consider:
From bottom to top occurance rating will be
<0.001 - 2,
0.001 to 0.01 - 3
0.01 to 0.1 - 4
0.1 to 0.5 - 5
0.5 to 2 - 6
2 to 10 - 7
10 to 20 - 8
20 to 50 - 9
50 to 100 ???? or
> 100 - 10
Top to bottom
> 100 - 10
100 to 50 - 9
50 to 20 - 8
20 to 10 - 7
10 to 2 - 6
2 to 0.5 - 5
0.5 to 0.1 - 4
0.1 to 0.01 - 3
0.01 to 0.001 ???? or
< 0.001 - 2
Questions:
1. If rejection is 30 per thousand what is the occurrence rating?? As per top to bottom its 8, as per bottom to top its 9, Whether it will be in 9 or 8?
2. While fixing occurrence we need to see from top to bottom or bottom to top?
3. If we considering rating from bottom to top, what is rating we need to give if rejection 50 to 100??
4 If we considering rating from top to bottom, what is rating we need to give if rejection 0.01 to 0.001??
Herewith I have attached the excel sheet. Please go through and clarify the questions mentioned.

Hari
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