#### Capability Test Type

This test type produces a report of gage variability based on the master value and sigma value that you enter in the GR&R Selection dialog box. The report includes the master value , the gage mean and gage sigma values, and a Capability Table that shows values for the following:

Cg: The potential gage index (Cg), used to determine whether or not the gage is accurately measuring the parts. Cg is measure of how many sigma curves can fit between given specification limits. You set the value for sigma through the GR&R Selection dialog box.

Cg will be calculated by dividing the gage sigma by the process sigma:

If you did not enter a value for the process sigma, Cg will be calculated by dividing six times the gage sigma value by 0.15 times the total tolerance for the selected variables:

where = Total Tolerance

Cgu: Upper specification gage index, used in determining Cgk. Cgu is calculated as:

Cgl: Lower specification gage index. Cgl is calculated as:

Cgk: Actual gage index. Cgk is a measure of how many sigma half curves will fit between the center and the closest specification limit. You set the value for sigma through the GR&R Selection dialog box.

% Variation (Cg): This field will show different values depending upon whether you have set your CONFIGURE options to use the American or European value for sigma. This is the total percent of gage variation, based on Cg, calculated as follows:

The maximum acceptable value is 15%.

% Variation (Cgk): The total percent of gage variation, based on Cgk, calculated as follows:

The maximum acceptable value is 15%.