NominalQC Feature
SPC & Process Capability
Control charts and Cp/Cpk computed straight from the inspections you already log — no spreadsheet, no re-keying.
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