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:

Cp Cpk True Dimension Diagram

QI Macros Add-in for Excel Contains and Easy to Use Template to Calculate Cp Cpk

  1. Open the template by clicking on QI Macros menu and selecting Capability Templates -> Cp Cpk Templates.

    capability menu
  2. The template has several tabs, select the Cp Cpk True Position worksheet.

    cp cpk excel template options

  3. Input your target and tolerances for the X and Y coordinates. Also input the allowable offset for X and Y.
    The target for the offset (D4:E4) is usually zero.

    true position template excel
  4. Enter actual measurements starting in cells B25 and C25 as shown.
  5. Evaluate Cp and Cpk for the X and Y location as well as the Cpk for the True Position:

    Cp Cpk True Position Results
  6. Also review the true position chart for any patterns.
    True Position Chart
 

Note: Tolerance is 1/2 the diameter of allowable true position. There is no LSL.

 

Maximum Material Condition Cpk

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).

True Position Maximum Material Condition (MMC) Cpk


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