Control Charts Are Drawn Daily, Yet Fail to Catch Any Abnormalities? — A Case Study of Rebuilding the SPC "Alarm but No Response" Loop in an Electronic Connector Manufacturing Company
1. The Charts Are Drawn, the Points Are Plotted, but Soldering Defects Still Occur Two years ago, an electronic connecto…
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· 9/9/2026
Can Control Charts Be Drawn for Only One Batch per Month per Variety? —— Five-Step Method for Selecting Three Types of Alternative Charts for Short-Cycle SPC
A quality engineer at a machining company has been staring at a control chart for two months, feeling frustrated. The ma…
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👁 140
· 9/15/2026
Tool Wear is Gradually Increasing, but the Control Chart Remains Silent? —— Five Steps for Monitoring Small Drifts with EWMA and CUSUM
An incident occurred at a machining company: during a quarterly inventory check, it was discovered that the scrap rate o…
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· 9/16/2026
Control Limits Set Once and Never Changed? — A Five-Step Method for Establishing, Inspecting, and Updating Control Limits
During a process audit at an automotive parts company, an auditor pointed to the X̄–R control chart hanging on the wall …
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👁 106
· 9/19/2026