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  Measurement, Test and Calibration
  R&R with unilateral specs.

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Author Topic:   R&R with unilateral specs.
MANRAM
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posted 07 March 2000 06:47 PM           Edit/Delete Message   Reply w/Quote
How can we calculate the R&R to a gauge if the process where is used only has unilateral tolerance? i.e. min 35 Lb-in

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David Drue Stauffer
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From:St. Louis, MO63132United States
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posted 09 March 2000 03:33 PM     Click Here to See the Profile for David Drue Stauffer   Click Here to Email David Drue Stauffer     Edit/Delete Message   Reply w/Quote
In the R&R process, the values are recorded and tabulated, the result is expressed as a percentage of the total tolerance. If the Low end of the tolerance is "0" and the high end of the tolerance is (-35) the absolute value of the total tolerance is "35". When the R&R Values are computed, squared and added together, then the square root is taken and divided by the tolerance, the resulting number is the gage R&R percentage.
10% is excellent, 11-30% is acceptable based upon the application, but should be closely monitored, and 31% or greater is unacceptable.

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MANRAM
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From:El Paso, Tx, USA
Registered: Mar 2000

posted 09 March 2000 06:04 PM     Click Here to See the Profile for MANRAM   Click Here to Email MANRAM     Edit/Delete Message   Reply w/Quote
Understand what you say, and that work if you have only specified the limit at the high side of the spec, but what happen when you have only the low side of the spec.?

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Batman
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posted 11 March 2000 10:57 AM     Click Here to See the Profile for Batman   Click Here to Email Batman     Edit/Delete Message   Reply w/Quote
Perhaps you could use the actual error as a guide. When you calculate a GR&R, you get 2 values, the actual error and a percent of tolerance. With respect to your minimum requirement of 35lb-in, if the actual error in your R&R in this case is say 3lb-in, and you can demonstrate that your process is capable to +38lb-in minimum, then the actual gage error of 3 will not cause you to accept bad product. Sign it off and make parts.

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