ASTM D5001 Standard Test Method for Measurement of Lubricity of Aviation Turbine Fuels by the Ball-on-Cylinder Lubricity Evaluator (BOCLE)
11. Procedure
11.1 The procedure for testing using the semi automatic method is described in Annex A1.
11.2 The procedure for testing using the fully automatic method is described in Annex A2.
12. Calculation and Interpretation of Results
12.1 Wear Scar Measurement:
12.1.1 Turn on the microscope light and position test ball under the microscope at 1003 magnification.
12.1.2 Focus the microscope and adjust the stage such that wear scar is centered within the field of view.
12.1.3 Align the wear scar to either a divisional point of reference on the numerical scale with the mechanical stage controls, or the cross hair graticule. Measure the major axis to the nearest 0.01 mm. Ensure that the measurement is taken to include the outermost edge of the wear scar (i.e. include all the wear scar region). Repeat the procedure for the minor axis. Record the readings on the data sheet. Typical wear scars are illustrated in Fig. 2 showing the measurement points.
12.1.4 Record condition of wear area if different from the reference standard test, that is, debris color, unusual particles or wear pattern, visible galling, etc., and presence of particles in the reservoir.
12.2 Wear Scar Calculation:
12.2.1 Calculate the wear scar diameter as follows:
WSD = (M + N) /2
where:
WSD = wear scar diameter, mm,
M = major axis, mm, and
N = minor axis, mm.
