First Pass Yield - Am I doing correct the First Pass Yield Metric

R

Rochy

#1
I would like to know if I am doing correct the First Pass Yield metric. After unit is assembled and inspected go to test. Technitian enter information on the FPY form why the unit did not pass test the first time, unit go to rework, inspection and comback to test. When Technitian istestin the unt again the unit pass the first rework but he or she found another failures of cource this is documented. Question my First count is the first time unit was tested. I still documented the other failures but it will not count for my First Pass Yield Test. Please advise

Rochy
 
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A

AdamP

#2
Re: First Pass Yield

Hi - Yes you have it correct. 'First Pass' yield is just that -the unit/item is evaluated on the first pass and that determines the yield. If it has been reworked, it did not pass the first time.

If you do want to look at yield after rework, you can use a rolled-throughput yield calculation. I've used that in the past to help identify trouble spots, or steps, in the process - areas most needing improvement.

Cheers,

Adam
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#3
Re: First Pass Yield

typically RTY is just the product of FPY, so if a second failure occurs at the same step after rework it wouldn't be included in the RTY value.

I track rework yield seperately.

If the second failure is due to poor rework it woudl be tracked in the rework metric. But if the failure wasn't caught at the first pass of the inspection becuase the first failure precluded that function from being tested, it is still a first pass failure.

The management dilemma when a part has multiple failure modes is that a lot of work can be done to remove falirues modes and yet the yield doesn't budge... When a product has multiple failure modes at any given station, RTY can be 'estimated' or expressed using the Poisson distribution:
Station Yield = e^-(average defect rate), where the average defect rate is the number of first pass unique failure modes or defects/# of units submitted to the test the first time. Then RTY = FTY1*FTY2*FTYN
 
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