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How to do a control chart - Machining product that requires flatness control

#1
Hi All

We had a problem on making the control chart.

We are producing machining product that required the flatness control. The cutting tool for this flat would be always replaced with a new one after every 300pcs are finished. And the 300pcs can be produced in three days.

When we are making the control chart, the control limits are always changing with the new cutting tool implemented.

Did anybody here encounter the same situation and could shed some lights on how to make the control chart? That will be greatly appreciated.

Thank you.
 


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