Frictional Torque at Low Temps (high viscosity) - D1478 Test

[jstluise]

I'd like to estimate the torques in a radial bearing at low temps due to the high viscosity of the grease. SKF has a friction model but it is not valid for these high of viscocities, so I am wondering if there is any other way to estimate without actual testing. The oil viscosity at -54C is 10,855 mm^2/s, the bearing ID is 2mm and OD is 5mm, with very low radial loads (<1 mNm) and low speeds (<2 RPM).

The grease (Braycote 601 EF) datasheet also lists low temperature torques per ASTM D1478, which seems useful but I don't know how to translate that into bearings of my size. I was unable to find specifics on the D1478 test.

If anyone can offer some advice on how to estimate the torques, either from the viscosity or the D1478 data, that would be very helpful!

 

[geesamand]

It seems that Braycote should be interested in finding an answer if they want your business. Likewise with a bearing company, however the bearing company might not be able to comment on Braycote brand products.