Cp Cpk True Position Template for Excel
What is True Position?
If you are drilling a hole which has an X and Y location, you have to be able to measure Cp and Cpk for both the X and Y dimensions as well as the overall location of the hole:
QI Macros Add-in for Excel Contains and Easy to Use Template to Calculate Cp Cpk
- Open the template using the menu QI Macros installs on your Excel toolbar.
- Input your target and tolerances for X and Y coordinates and allowable offset.
The target for the offset (D4:E4) is usually zero
- Enter actual measurements as shown.
- Evaluate Cp and Cpk for the X and Y location as well as the Cpk for the True Position:
- Also review the true position chart for any patterns.
Note: Tolerance is 1/2 the diameter of allowable true position. There is no LSL.
If you have a cylinder with an inside and an outside diameter, you can determine Cpk using the MMC template. The X and Y offsets are optional. You just need measurements of the outside and inside diameters to calculate Cpk (N4).
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