If you meant by "ball on flat" tribometer, it is a conventional type of tribometer that you can use. Normally, a sphere (ball) comes on to a rotating (with a specific velocity) flat disk, and as typical tribometer, it measures load and friction. After experiments, using imaging techniques, you can also check the damage (wear) tracks on the surfaces.

If you meant by "ball on flat" tribometer, it is a conventional type of tribometer that you can use. Normally, a sphere (ball) comes on to a rotating (with a specific velocity) flat disk, and as typical tribometer, it measures load and friction. After experiments, using imaging techniques, you can also check the damage (wear) tracks on the surfaces.

Hi Abdul,

Please provide some more details of the "a ball tester". One test configuration is explained by @Dong Woog Lee. As I can see from your post that you are planning to perform lubrication test of cooking oil. There is another test configuration that will provide you with valuable information about lubrication properties. Additional information about the equipment you have will allow us to assist you better.

Hi,

The researching elements in four-ball apparatus are four bearing balls made in 0th accuracy class and selection group tolerance of 0.8 µm and Rockwell hardness of 60 HRC. The ball fixing in lower clamp 2 filled with researched lubricant with temperature of 20±5 oC is realized by means of threaded shield with coned-shape hole Fixed balls are tightened with variable force to the upper ball, which is rotated by electric motor, transmission and dedicated clamp.......

http://www.acta.mechanica.pb.edu.pl/volume/vol9no1/03_2014_061_SZPICA_CZABAN_BANASZUK_WERESA.pdf

Sorry - file in Appendix is in a Polish language

Sincerely

Dariusz