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FMEA Rating Scale

The document defines criteria for assessing the severity, occurrence, and detection of issues. For severity, it rates issues from none to hazardous without warning based on the impact on products and repair needs. Occurrence is rated from remote to very high based on the frequency of problems per thousand pieces. Detection ratings range from very high to almost impossible based on the method used to detect errors, including automatic gauging, inspection layers, and visual checks.

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Sridharan Venkat
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641 views2 pages

FMEA Rating Scale

The document defines criteria for assessing the severity, occurrence, and detection of issues. For severity, it rates issues from none to hazardous without warning based on the impact on products and repair needs. Occurrence is rated from remote to very high based on the frequency of problems per thousand pieces. Detection ratings range from very high to almost impossible based on the method used to detect errors, including automatic gauging, inspection layers, and visual checks.

Uploaded by

Sridharan Venkat
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLS, PDF, TXT or read online on Scribd
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SEVERITY

S.No Description Criteria


1 None Slight inconvenience to operation or operator or no effect.
A portion (less than 100%) of the product may have to be reworked, with
2 Very minor
no scrap, on-line but in-station.
A portion (less than 100%) of the product may have to be reworked, with
3 Minor
no scrap, on-line but out-of-station.
The product may have to be sorted, with no scrap, an a portion (less than
4 Very low
100%) reworked
100% of product may have to be reworked, or vehicle/item repaired
5 Low
offline but does not go to repair department.
A portion (less than 100%) of the product may have to be scrapped with
6 Moderate no sorting, or vehicle/item repaired in repair department with repair time
less than half an hour.
Product may have to be sorted an a portion (less than 100%) scrapped,or
7 High vehicle/item repaired in repair department with repair time between half
an hour and an hour.

100% of product may have to be scrapped, or vehicle/item repaired in


8 Very high
repair department with a repair time greater than one hour.

Hazardous
9 May endanger operator (machine or assembly) with warning.
with warning
Hazardous
10 without May endanger operator (machine or assembly) without warning.
warning

OCCURRENCE

S.No Description Criteria

1 Remote <= 0.01 per thousand pieces

2 Low 0.1 per thousand pieces

3 Low 0.5 per thousand pieces

4 Moderate 1 per thousand pieces

5 Moderate 2 per thousand pieces

6 Moderate 5 per thousand pieces

7 High 10 per thousand pieces

8 High 20 per thousand pieces

9 Very high 50 per thousand pieces

10 Very high => 100 per thousand pieces


DETECTION

S.No Description Criteria

Discrepant parts cannot be made because item has been error proofed by
1 Very high
process/product design.

Error Proofed or Gauging Inspection. Error detection in-station


2 Very high (automatic gauging with automatic stop feature). Cannot pass discrepant
part.
Error Proofed or Gauging Inspection. Error detection in-station, OR in
3 High subsequent operations by multiple layers of acceptance: supply, select,
install, verify. Cannot accept discrepant part.
Error Proofed or Gauging Inspection. Error detection in subsequent
Moderately
4 operations, OR gauging performed on setup and first-piece check (for
high
setup causes only).
Gauging Inspection. Control is based on variable gauging after parts have
5 Moderate left the station, OR Go/No Go gauging performed on 100% of the parts
after parts have left the station.

Gauging or Manual Inspection. Control is achieved with charting


6 Low
methods, such as SPC (Statistical Process Control)

7 Very low Manual Inspection. Control is achieved w/ double visual inspection only.

8 Remote Manual Inspection. Control is achieved w/ visual inspection only.

Manual Inspection. Control is achieved w/ indirect or random checks


9 Very Remote
only.

Almost
10 Manual Inspection. Cannot detect or is not checked.
impossible

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