SAE ARP6255

1. SCOPE
2. APPLICABLE DOCUMENTS
3. WARNING
4. METHOD SUMMARY
5. APPARATUS
6. CONSUMABLES
7. APPARATUS PREPARATION
8. CALIBRATION AND STANDARDIZATION
9. ASSEMBLY
10. TEST SEQUENCE
11. DISASSEMBLY OF TEST APPARATUS
12. MEASUREMENT OF THE WEAR SCAR
13. CALCULATIONS
14. REPORT
15. PRECISION
16. NOTES

Employing ‘ball-on-cylinder’ philosophy, a non-rotating steel ball is held in a vertically mounted chuck and using an applied load is forced against an axially mounted steel cylinder.

Employing ‘ball-on-cylinder’ philosophy, a non-rotating steel ball is held in a vertically mounted chuck and using an applied load is forced against an axially mounted steel cylinder. The test cylinder is rotated at a fixed speed while being partially immersed in a lubricant reservoir. This maintains the cylinder in a wet condition and continuously transports a lubricating film of test fluid to the ball and cylinder interface. The diameter of the wear scar generated on the test ball is used as a measure of the fluid’s lubricating properties.The apparatus can be used, by adjusting the operating conditions, to reproduce two different wear mechanisms; mild and severe wear, the ALTE therefore has the ability to assess a lubricant’s performance in that regard. These mechanisms are described below.