CPK fail on T Value

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  • CPK fail on T Value

    I seem to be unable to get Datapage to calculate Cp or CPK on any T value. The PP is always 0.000 and the Ppk is negative...

    I suspect this is because my USL and LSL are the same, even though it's programmed in PcDmis as +/-. I can't change it in Datapage as far as I can tell, any ideas?

    ***Edit***

    The menua to change my USL and LSL was hidden, I had to check a box, show it, then put a "-" in from of my LSL, working fine now.
    Last edited by Jrgunn5150; 11-13-2017, 03:27 PM.

  • #2
    Originally posted by Jrgunn5150 View Post
    I seem to be unable to get Datapage to calculate Cp or CPK on any T value. The PP is always 0.000 and the Ppk is negative...

    I suspect this is because my USL and LSL are the same, even though it's programmed in PcDmis as +/-. I can't change it in Datapage as far as I can tell, any ideas?
    You can change tolerances in DataPage on the DataEditor tab. Right click on the variable and select "Edit Variables".

    In PC-DMIS, are you using the option to "Show minus tolerances as negative" (or whatever the actual wording is). DataPage requires minus tolerances to have the "-" sign. And PC-DMIS may or may not, depending on your selection.
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