gage systems by jus-rite engineering DESIGNERS AND BUILDERS OF
GAGES AND SPECIAL MACHINES

CERTIFIED TO
 ISO9001:2008

Elkhart, IN.  574-522-9600
 
Gauge Repeatability and Reproducibility

Gage Repeatability and Reproducibility, or GR&R, is a measure of the capability of a gauge or gage to obtain the same measurement reading every time the measurement process is undertaken for the same characteristic or parameter. In other words, GR&R indicates the consistency and stability of a measuring equipment. The ability of a measuring device to provide consistent measurement data is important in the control of any process.


Mathematically, GR&R is actually a measure of the variation of a gage's measurement, and not of its stability. An engineer must therefore strive to minimize the GR&R numbers of his or her measuring equipment, since a high GR&R number indicates instability and is thus undesirable.




gage systems

= INCH      
  = MM      
Part Tolerance 2 TRIALS 3 TRIALS 5 TRIALS ANOVA
10% 20% 10% 20% 10% 20% 10% 20%
.005 .000110 .000220 .000164 .000328 .000226 .000452 .000161 .000322
0.13 0.00286 0.00572 0.00429 0.00858 0.00585 0.01170 0.00419 0.00838
.004 .000088 .000176 .000131 .000262 .000181 .000362 .000128 .000256
0.10 0.00220 0.00440 0.00330 0.00660 0.00450 0.00900 0.00322 0.00644
.003 .000066 .000132 .00098 .000196 .000136 .000272 .000096 .000192
0.076 0.00167 0.00334 0.00251 0.00502 0.0032 0.00684 0.00245 0.00490
.002 .000044 .000088 .000066 .000132 .000091 .000182 .000065 .000130
0.050 0.00110 0.00220 0.00165 0.00330 0.00225 0.00450 0.00160 0.00322
.001 .000022 .000044 .000033 .000066 .000045 .000090 .000032 .000064
0.025 0.00055 0.00110 0.00083 0.00166 0.00113 0.00226 0.00081 0.00162
.0008 .000018 .000036 .000026 .000052 .000036 .000072 .000026 .000052
0.020 0.00044 0.00088 0.00066 0.00132 0.00090 0.00180 0.00064 0.00128
.0006 .000013 .000026 .000020 .000040 .000027 .000054 .000020 .000040
0.015 0.00033 0.00066 0.00050 0.00100 0.00068 0.00136 0.00048 0.00096
.0005 .000011 .000022 .000016 .000032 .000023 .000046 .000016 .000032
0.013 0.00029 0.00058 0.00043 0.00086 0.00059 0.00118 0.00042 0.00084
.0004 .000009 .000018 .000013 .000026 .000018 .000036 .000013 .000026
0.010 0.00022 0.00044 0.00033 0.00066 0.00045 0.00090 0.00032 0.00064
.0003 .000007 .000014 .000009 .000018 .000014 .000028 .000009 .000018
0.0076 0.00017 0.00034 0.00025 0.00050 0.00034 0.00068 0.00024 0.00048
.0002 .000004 .000008 .000007 .000014 .000009 .000018 .000007 .000014
0.005 0.00011 0.00022 0.00017 0.00034 0.00023 0.00046 0.00016 0.00032
.0001 .000002 .000004 .000003 .000006 .000005 .000010 .000003 .000006
0.0025 0.00006 0.00012 0.00008 0.00016 0.00011 0.00022 0.00008 0.00016