At V-Research, we have a modular tribometer with the possibility to conduct shaft-on-plate experiments. Wear measurements can be performed for a wide range of geometries, materials and wear depths. However, due to a specific friction measuring system (measurement of the lateral force, not the friction moment), the assessment of coefficients of friction is currently limited to relatively small wear depths. For more information, please contact me per e-mail.
There are actually lots of institutes that could run the ASTM G77. Important is that they have the Falex Block on Ring machine available, as that is the ASTM called out instrument to do the test with.
Falex Corporation in Illinois, Falex Tribology in Belgium, for Europe are two independent and affordable institutes to run these tests. Let us know if you want a quote.