For Educators · SPC Control Chart
SPC Control Chart for a surface finish
Built for educators teaching it to a class. Drop a live demo into a lecture or assign it as a shareable link — no lab installs. Simulate a surface finish live below — adjust the inputs and watch it respond, right in your browser.
SPC Control ChartLive
in control or not?
Controls
Presets
Statistical process control watches a process over time against control limits set at three standard deviations from the target. Points inside are normal random variation — leave them alone. A point beyond the limits, or a run trending one way, signals a real change worth investigating. Nudge the process shift and watch points breach the limits.
Data Inspector
Center line50
Control limits±3σ (44–56)
Out of control0
Governing equation
Reading this result: The process is centered on target: points scatter randomly inside the ±3σ limits, so every point is just noise — reacting now would only add variation (tampering).
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
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Frequently asked questions
- Is this good for educators?
- Yes — this version of "SPC Control Chart for a surface finish" is framed for educators teaching it to a class. Drop a live demo into a lecture or assign it as a shareable link — no lab installs.
- Do I need to install anything?
- No. It runs in any modern browser, free, with no account required.