Upgrade quality management from "firefighting after the fact" to "preventing within the process." Six chart types — Xbar-R, Xbar-S, P, NP, C and U — are plotted in real time, CPK / PPK process-capability indices are calculated automatically, the Nelson 8 out-of-control rules are detected automatically, and alerts fire before a deviation ever occurs.
From data capture and control-chart plotting to anomaly detection and a closed improvement loop
Xbar-R / Xbar-S / individual X-MR / median charts, for continuous variables such as dimension, weight and current.
P / NP / C / U charts, for discrete data such as defect rate, defect count, number of defects and defects per unit.
Process-capability indices are calculated automatically and compared in real time against customer baselines (1.33 / 1.67), with trends visible.
Automatic detection of 8 abnormal patterns such as 1 point beyond 3σ, 9 consecutive points on one side, and 6 consecutive increasing / decreasing points.
The moment an out-of-control point appears, it's pushed to PDA / DingTalk / WeCom, getting a quality engineer on-site within 5 minutes.
Once an anomaly is confirmed, log the cause with 5W2H, link it to an 8D improvement workflow, and close the PDCA loop.
The biggest pain in SPC isn't plotting — it's collecting data. SBK MES extends data sources to 3 channels: ① worker PDA reporting ② direct Bluetooth readout from gauges such as calipers, micrometers and height gauges ③ automatic push of PLC / SCADA equipment data.
CPK over last 8 periods
Customer audits care most about whether CPK is stable and meets target. The system rolls up CPK by operation + critical characteristic, comparing the trend chart against the customer baseline (1.33 or 1.67), with an automatic alert when it falls below baseline for 3 consecutive periods.
When an anomaly alarm appears, the system doesn't just "beep" and move on — it triggers 5W2H cause logging, an 8D improvement workflow, effectiveness verification and mistake-proofing measures, for a complete PDCA loop.
IATF 16949 requires critical-characteristic CPK ≥ 1.67; the system auto-generates the PPAP report monthly.
Injection pressure / holding / mold temperature enter SPC in real time, warning of process drift before products go out of spec.
Per-board solder-joint defect rate is plotted as a P-chart; 9 consecutive boards increasing triggers preventive maintenance.
An individual-moving-range chart for batch pH automatically halts feeding before pH drifts to the customer limit.
SPC is the quality brain — its data comes from inspection and reporting, and its results drive traceability and defect handling
Sign up to try control charts and automatic CPK calculation for free, or book a consultant demo