iSixSigma

Distructive MSA

Six Sigma – iSixSigma Forums Old Forums General Distructive MSA

Viewing 4 posts - 1 through 4 (of 4 total)
  • Author
    Posts
  • #37795

    bach huss
    Participant

    Hi all,
    Does anyone has any example on distructive MSA? I have Minitab 14 and it has build in Gauge RnR for crossed and also nested. I notice on the nested it is required to do a repaet on the same unit. (I think it is required for the variance component estimation for the repeatability).
    Thanks in advance for your help.
     
    Rgds
    Bach

    0
    #112104

    Bob J
    Participant

    Bach,
    We ran a series of projects around optimizing a captive plating line…  In one of the projects we changed over a Cyanide Cad process to a vastly more environmentally friendly ZnCo process…  This new process required a series of titrations to determine various component and contaminate levels…. 
    The titration process was destructive to the sample…  We also qualified our parts and optimized our process using a salt spray technique where sample parts were placed in a corrosive environment that degraded the finish.  The critical characteristic was how long the part was able to withstand the accelerated life environment without showing rust.  This was also a destructive test…  In both cases, the best we could do for the R&R was to try and run a group of similar samples…
    Hope this helps….
    Best Regards,
    Bob J
     
     

    0
    #112113

    Ropp
    Participant

    Bach,
    I have run destructive testing gage R&R using the nested design of experiment in Mintab before it was a part of their gage R&R choices.
    First review how to set up your data for a nested design of experiment,  in Minitab.
    Second review Donald Wheeler’s paper from SPC Press that gives you the format for performing a destructive Gage R&R. THat should give you all the info you need in how to arrange your samples and setting up your data for analysis.
    Also the people at Minitab are very helpful. Sorry I don’t have my
    files or paperwork or I would share this with you.
    Hope some of this helps,
    Dave

    0
    #112149

    bach huss
    Participant

    Thank u all for yr response,
    I have reviewed the nested requirement from Minitab for Nested Gauge and i found out it has to be have minimum of two repeats (something to do about the ability to estimate the variance component of repeatability).
    Another idea i have, for eample if we are trying to qualify a pull test RnR. By not pulling samples that will be distructive, could we subsitute the experiment with standard weight. (So that we could repeat at least two measurement). I would suggest we choose different weight applicapble to the gauge operating range.
    This is what i think but is this way an industrial practice.
     
    Rgds
    bach

    0
Viewing 4 posts - 1 through 4 (of 4 total)

The forum ‘General’ is closed to new topics and replies.