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For a measuring instrument, should MSA be done first or the Capability studies?

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#1
Hi,

We have a measuring instrument that we have used for a while and should we start to do cap.study or MSA first? This instrument will later on be used for cap.studies. Now we are using it for inspection only.
 
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#3
Re: Cap.study or MSA first?

Hello again,

If we just check % Tolerance, i see no problem to do that study and the variation of the collecting parts from the production do influence the result.

We had a meeting last week and we decided to have to analyse if the m.system is good enough to use for cap.studies (SPC) also. Then we have to check % Study Var aslo but i see immediately problem when it becomes to collecting parts. Few parts will be produced in the near future, diffucult to have parts that represent the normal process variation and will result in bad decision in the end.

Shall we anyhow focus on doing several cap.studies first to know our process then make the MSA study?
 

Bev D

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#4
Re: Cap.study or MSA first?

Hello again,


We had a meeting last week and we decided to have to analyse if the m.system is good enough to use for cap.studies (SPC) also. Then we have to check % Study Var aslo but i see immediately problem when it becomes to collecting parts. Few parts will be produced in the near future, diffucult to have parts that represent the normal process variation and will result in bad decision in the end.

Shall we anyhow focus on doing several cap.studies first to know our process then make the MSA study?
If you aren't making very many parts and you won't have parts that are representative of the process variation then your capability study will also be useless as it won't be representative of the process variation.

can you explain this situation a bit more?
 
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#5
Re: Cap.study or MSA first?

The question i first has to ask myself is ; How do i get to know the process in the best way? We produce a special customised detail that differs a lot from time to time, depends on the quantity of order from customers. I think we have to start to know our process, how the variation of the detail spreads over time=> cap.studies. When this has been analysed we can start to focus on the MSA. or?
 
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