Quality Control (stability) Chart for CMM's - How the control limits are to be calculated

Nihls

Registered
#1
Hello,

We want to keep the stability of our coordinate measuring machines under control using a quality control card.

CMM: Zeiss Prismo Ultra
Measuring standard: KMG Check

It is not clear to me how the control limits are to be calculated. Does anyone have any experience in this regard?

Best regards
 
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malasuerte

Involved In Discussions
#2
Hello,

We want to keep the stability of our coordinate measuring machines under control using a quality control card.

CMM: Zeiss Prismo Ultra
Measuring standard: KMG Check

It is not clear to me how the control limits are to be calculated. Does anyone have any experience in this regard?

Best regards

Sorry - you are asking HOW to calculate control limits? You probably should take a stats class so you get full comprehension.

But in short:
  1. First calculate the Center Line. The Center Line equals either the average or median of your data.
  2. Second calculate sigma. The formula for sigma varies depending on the type of data you have.
  3. Third, calculate the sigma lines. These are simply ± 1 sigma, ± 2 sigma and ± 3 sigma from the center line.

    + 3 sigma = Upper Control Limit (UCL)
    - 3 sigma = Lower Control Limit (LCL)
 
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