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Capability Studies & Statistical Analysis

Statistical Process Control

  • SPC
  • Gage R&R
  • PPAP


SPC (Statistical Process Control) is the statistical analysis of measurement data collected from a manufacturing process to determine its viability and make educated corrections to a process. SPC is an integral step in the production part approval process. Besides requiring a significant number of repetitive measurements (for which DCC-CMM’s are nearly indispensable) complex data compilation, analysis and interpretation are required. Q-PLUS routinely provides statistical results (such as Cpk, Cp, Ppk, Pp, Sigma level, etc.) supported by quantitative measurement data and depicted in a variety of graphical analyses. 


Capability Studies provide a greatly enhanced examination and validation of manufacturing processes. These are commonly utilized in high-production applications such as automotive, components and commercial products. Q-PLUS provides many types and degrees of capability studies tailored to any application or special customer requirements.


An important component of any comprehensive capability study is analysis of the measurement process itself. A Gage R & R (Repeatability & Reproducibility) study is a common way to determine what amount of error in a process is due to measurement uncertainty.


PPAP or Production Part Approval Process is a standard requirement in the automotive industry that occurs at the beginning of or after a change to a manufacturing process.

Recent News

Q-PLUS Labs' Service Spotlight: CT Scanning Services

March 2017: Did you know that Q-PLUS Labs has significant CT Scanning capabilities, specifically tailored to your application? For dimensional inspection, testing, or reverse engineering, our lab has the expertise to accurately measure large or small sized parts and assemblies. We provide high quality CT Scanning data, post processed into the information or results that you need (such as inspection reports or 3D CAD models). We are experienced in tackling projects with parts or assemblies containing many internal features, even those where nondestructive inspection is mandatory in order to gain access for conventional measurement or for other uses such as imaging and failure analysis. Click here to request a quote.

CT Scanning Service

2017 MD&M West

February 2017: Join Q-PLUS Labs at the 2017 MD&M West show at the Anaheim Convention Center in Anaheim, CA - February 7-9. Our booth has moved! Find us upstairs in the Precision Tec area. We will be unveiling a never before seen, cutting-edge, mystery measuring machine! We will also have the industry's leading measurement manufacturers featuring state of the art systems, software, and live demonstrations. Click here for Free Admission

MD&M West 2017

Q-PLUS Labs’ Nano Measurement Arsenal Expands with New Laser Confocal System

January 2017: Q-PLUS Labs expands its extensive nano measurement capabilities with the introduction of a new laser confocal microscope for non-contact measurement. Using supremely high accuracy laser scanning, this system is extremely versatile and able to perform color profilometry as well as precise measurements down to .5 nanometers (500 picometers)! The system's speed of data acquisition has an incredibly fast response time and can characterize surfaces for accurate measurement results with high-resolution and low noise on a variety of objects, even almost to the "equator" on difficult to measure spherical shapes! Click here to request a quote.