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NominalQC Feature

SPC & Process Capability

Control charts and Cp/Cpk computed straight from the inspections you already log — no spreadsheet, no re-keying.

Try this in the live demo — no signup →

SPC page with Cp/Cpk/Pp/Ppk tiles and an X̄ control chart flagging an out-of-control pointPrintable Statistical Process Control Report with capability table, control charts, histogram, and signature lines

What you can do

  • Built on the measurements your inspectors already record — pick a part and characteristic and the charts are just there
  • Picks the right chart for the data automatically: X̄-R when inspections capture multi-sample subgroups, I-MR for single readings — with a manual override when you want it
  • Control limits from the standard AIAG constants; out-of-control points flagged in red on the chart
  • Cp, Cpk, Pp, and Ppk side by side with both σ estimates (within-subgroup and overall), % out of spec, and a distribution histogram against the spec limits
  • Honest numbers: any point outside the control limits and the report says the capability indices are unreliable until the special cause is resolved; short series are labeled preliminary
  • Tolerance revised mid-series? The chart still shows every reading, but capability is computed only under the current spec — with a note saying so
  • Print a document-style SPC report — title block, capability table, captioned figures, and signature lines under your company header — ready for a customer or an auditor
  • Date-range presets (last 90 days, this month, all time) or any custom range

Works together with

Quality Reports →Inspection Log →Gauges & Calibration →

See it with your own parts.

Free for one user. No credit card required.

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