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 The New Elsmar Cove Forums The New Elsmar Cove ForumsThe Elsmar Cove Forums   17025, Guide 25, A2LA (Cal., Meas., and Test)   How do I do a GR&R study if there is no specified tolerance?    profile | register | preferences | faq
 Author Topic:   How do I do a GR&R study if there is no specified tolerance? kristinunregistered posted 28 June 2001 01:46 PM               I am writing a proposal for a supplier to include GR&R and Cpk data with shipments. One very important specification for this material invloves only a lower limit (example, >50 MPa). All of the formulas I have seen for EV and AV involve using the specified tolerance. Since I don't have a tolerance specified for this parameter, is it possible to calculate the %R&R? Is it possible to do a GR&R study without changing this spec? I would appreciate any suggestions. I will be performing a process capability analysis (Cpk) for this particular parameter and I know this is possible when only one limit is specified. Thanks!!IP: Logged Al DyerForum Wizard Posts: 814From:Lapeer, MI USARegistered: Oct 2000 posted 28 June 2001 07:31 PM                Kristin,I'm not sure about formulas for your situation, but I pose this:As the customer, could you set an upper limit for your supplier?i.e. >50 ----- < 300I guess I would have to ask why there is no upper limit? I don't know your process.Only you or your company has the knowledge to know what that upper limit would be.ASD...IP: Logged aysanunregistered posted 14 July 2001 11:46 PM               Hithere are three types to calculate EV%, AV% and R&R%:EV%=EV/RFAV%=AV/RFR&R%=R&R/RFwhere, Reference Figure is one of these parameters:- Tolerence(USL_LSL)- Process Variation (6 sigma)- Total Variation(TV=PV+R&R) If you don't have Tolerence, you can use two types else to calculate those parameters.AysanIP: Logged Dave StaufferLurker (<10 Posts) Posts: 3From:O'Fallon, MO, USARegistered: Jul 2001 posted 18 July 2001 09:41 PM                Contact AIAG and request an MSA Manual.Look for the forms that utilize process variation rather than tolerance for finding the percentage R&R. ANOVA does this.------------------Dave StaufferIP: Logged Al DyerForum Wizard Posts: 814From:Lapeer, MI USARegistered: Oct 2000 posted 18 July 2001 10:03 PM                Good call!IP: Logged
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