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Gage R R Process tolerance and Historical Sigma

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  • #37863

    JB
    Participant

    I am performing a Gage R & R and I am not sure what the process tolerance definition is and whether or not to use the historical sigma. The process is measuring the off torque off Child resistent caps on bottles and the of torque must be within 7 to 13 Inch Pounds. We are attemping to set up the line which performs the on torque to eventually remove the cap to the specified off-torque range. My objective is to know how much variation there is in my measuring system to measure off torque. Can some when educate me as to what the process tolerance definiton is as related to this test and whether to or not to use it and the historical sigma? When we off torque now, we have a std dev of 2.12 in lbs historically.
    Thanks

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    #113044

    KWalker
    Participant

    Your process tolerance is what your spec allows, in this case 6 in-lb (13-7). Your Gage R&R results will give you two sets of measurements – one related to how well the measurement system can measure differences in your process (%study variation or % contribution in Minitab), and one relating to how good your measurement system is for accepting or rejecting product (% process tolerance). You must enter the process tolerance to get the % process tolerance output. Your measurement system can be good enough for one, but not the other, since you are looking at the amount of gage R&R variation as a percentage of two different denominators – your product specs for accept / reject, and your baseline process variation in the case of % study variation.   

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