Capability Studies: Can I combine Attribute Data and Variables Data

O

Oloriko

#1
Hello,

I am new to the quality assurance but I have been selected to champion process improvement efforts because I was nominated:rolleyes:!

I am working on a process improvement for a bottling plant. I have collected data - machine outputs and defects.

I am attempting to answer two questions :
1) Capacity: Are the machines producing as per design capacity?
2) Quality: Is the defect level acceptable?

Can I combine both (variable and attribute) data to get a 'Total' capability? if yes, how?

Thanks in advance.
 
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J

JaxQC

#2
Re: Capability Studies: Can I combine attribute and variable data

Yes you can if you look at it in generic terms. Try looking up FTQ (First Time Quality). It'll be in units of ppm (parts per million). In essence what you are looking at is “what did not make it to the next step in the flow”. eg.. 30 pcs fall out for variable data (2 short, 3 long, 25 hole dia), next step 50 drop out for color match (attribute). You don’t care why it fell out (at least yet), just that did so now you have a common unit of measure (didn’t pass). You can now look at it in terms of qty or cost. Prefer cost but depends on your commodity. The 30 pc operation costs a dime ($3.00) but the 50pc operation only costs a penny ($0.50). So now you know which area to work in first. Within that area look at the hole dia (biggest bang for your buck.
As a side note ignore re-work. It doesn’t matter that you could re-work and save the 25 pcs for hole dia, that’s a separate issue. The FTQ is looking that the part didn’t make it to the next step the first try, not that you saved it later.

Hope that helps.
 
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