Monitor production quality - Internal KPIs

[rviso]

Hello everybody,
we are going to review internal KPIs for quality on manufacturing processes.
Today we are using this failure rate: failed parts/released units
we have different work lines for assembling and 100% EOL test
We are thinking use FPY but would be partial for intermediate failures before EOL.
thanks for any suggestion and good experience

rv

 

[pziemlewicz]

Rolled Throughput Yield is a better calculation if you want to address intermediate failure.
https://www.isixsigma.com/dictionary/rolled-throughput-yield-rty/

 

[Jim Wynne]

Before you choose a tool, you have to determine what it is that you want to know.

 

[rviso]

many thanks for your help!
of course we need to have a synthetic "dimension" of the quality performance for manufacturing (for any kinf od responsability).
Globally first and then detailed for steps

 

[John Predmore]

First Pass Yield could be an appropriate Key Process Indicator. FPY uses total units in the denominator, not released units, so no benefit to hold back release counts at the end-of-month to influence the production ratios. FPY puts less incentive on reworking parts, or getting rejects accepted use-as-is. Instead, the emphasis is to make parts right the first time.

If I understand your question, a comparison of FPY scores between departments might be an incomplete picture and unfair comparison. So instead, compare each department's FPY this year (or month) to FPY for the previous time period.

 

[Jim Wynne]

Trying to identify a KPI without knowing what it is you want to know specifically is a bass-ackwards way of going about things. KPIs shouldn't be created just because of a vague notion that you should have one. Identify specifically what needs to be measured or tracked and then devise the best way to do it.