ASTM D2670 method for measuring wear properties of fluid lubricants
ASTM D2670 standard test method for measuring wear properties of fluid lubricants (Falex pin and Vee block method)
14. Report
14.1 Report seizure if V-block and journal seize at test load.
14.2 Report total teeth wear for test completing the prescribed test time.
15. Precision and Bias
15.1 The following criteria should be used for judging the acceptability of results (95 % confidence) (Note 8):
15.1.1 Repeatability - The difference between successive test results, obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, and in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
22 % of the mean.
15.1.2 Reproducibility - The difference between two, single and independent results, obtained by different operators working in different laboratories on identical test material would, in the long run, and in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
49 % of the mean.
NOTE 8 - The precision data were derived from results of cooperative test on reference fluids Blends A and B, covered in Table X1.1. The repeatability value shown, 17, is the largest of calculated values from all tests. The reproducibility value shown, 25, is the larger of the values obtained in the Series 1 tests, the only test in which identical fluids were tested by the cooperators.
15.2 Bias - Since there is no accepted reference material suitable for determining the bias for the procedure in Test Method D2670 for measuring wear, no statement on bias is being made.
16. Keywords
16.1 pin and vee; tooth count; wear
