Calculate Gap Pools overview how to example data see also
Calculate Gap Pools Six Sigma > Design for Manufacturability > Calculate Gap Pools
Determines and displays the short-term and long-term gap statistics, which are used to assess the potential state of the assembly. This collective measure, when allocated, guarantees a long-term gap Z benchmark of Zp.
This dialog box is the first of two used in calculating tolerances procedure. The second dialog box is Allocate Gap Pools.
Element names: Enter a column containing names for the elements. If you do not enter names, the defaults are Element 1, Element 2, etc.
Means: Enter a column containing the means of the elements in the assembly.
Directional vectors: Enter a column containing the directional vectors for the elements in the assembly.
Standard deviations: Enter a column containing the standard deviations of the elements in the assembly (short-term standard deviations). If any of the standard deviations are missing, Minitab opens the Sigma Estimator subdialog box.
Long-term PPM: Enter the PPM value you want to obtain for the long-term gap distribution. The value you enter must be a positive number less than 1,000,000. The default is 3.397673, which corresponds to having a long-term gap Z = 4.5.
Gap Specification
Lower spec: Enter a positive or negative lower specification limit for the assembly gap. Minitab always assumes there is a lower specification on the gap. The default is 0.
Upper spec: Enter a positive upper specification limit for the assembly gap. There is no default upper specification.
Nominal: Enter a positive nominal specification for the assembly gap. The default nominal specification is the midpoint between the upper and lower specification if both are specified, or the gap mean if there is only a lower specification.