Need Grease recommendation for 6,500 rpm bearing
Need Grease recommendation for 6,500 rpm bearing
(OP)
Hello all,
This is my first post. I need tips for a bearing grease lubricant for a ball bearing application. I'll list the specs below.
Bearing ID: 80.00mm
Operating RPM: 6,500
This is my first post. I need tips for a bearing grease lubricant for a ball bearing application. I'll list the specs below.
Bearing ID: 80.00mm
Operating RPM: 6,500





RE: Need Grease recommendation for 6,500 rpm bearing
RE: Need Grease recommendation for 6,500 rpm bearing
they all do recommend specific types of lubricants, depending om circumferential speed, temperature, type of load etc. if for the particular application "grease" is regarded as a suitable lubricant, also the composition of the grease itself becomes important: thickener type, base fluid viscosity and usable temperature range all play a major role in finding the optimal lubricant.
RE: Need Grease recommendation for 6,500 rpm bearing
RE: Need Grease recommendation for 6,500 rpm bearing
RE: Need Grease recommendation for 6,500 rpm bearing
Way more specs are needed.
for instance, deep groove Ball bearing?
I'm guessing median diameter is 100 mm, so speed factors n ∙ dm = 650,000.
That is high speed, but achievable with "grease."
Precision machine tool spindles do it all the time.
But their bearings are VERY carefully made, and all the mating components require abutment runouts, seat concentricity and size to be accurate to 0.0001" .
At the very least Special high speed grease is needed.
starting page 24
https://www.klueber.com/ecomaXL/files/Lubrication_...
https://www.schaeffler.com/remotemedien/media/_sha...
RE: Need Grease recommendation for 6,500 rpm bearing
RE: Need Grease recommendation for 6,500 rpm bearing
not each and every lubricant supplier is able to supply all possible grease types. some of them have specialised on products for specific types of application. generally speaking the marketed greases fall in two categories. on the one hand greases that are truly "multipurpose" in the sense that they combine corrosion protection, mechanical stability, water resistance, load carrying capacity and oxidation stability at such a level that most applications can satisfactory be lubricated. over the years the "application envelope" has been enlarged including higher temperatures, longer relubrication intervals, better mechanical stability and higher water resistance. lithium and lithium/calcium based greases and most complex greases are examples of this grease types and may account for over 75% of the volume of grease sold.
the second category are the "special greases" - products that excel in some particular areas, and usually are not optimally formulated where other requirements are also important. in this group you will encounter "low noise" greases, high temperature greases, greases with special cold flow properties, resistance to various chemicals etc. a lot of them are based on less familiar thickener types and synthetic base fluids. they can help out where "multi purpose " greases are not good enough - at a price. some special greases may cost up to 500 times as much per unit of weight then standard "multi purpose" greases!
RE: Need Grease recommendation for 6,500 rpm bearing
Regarding a grease-lubed high dN bearing, the ratio of grease to internal bearing volume is important, as badservo noted. The Klueber technical manual linked by Tmoose has a good chart on page 12 showing that a bearing operating at a dN of ~600k should only be filled with grease to between 15-25% of its internal volume. This can involve some careful re-lubrication procedures. The old contaminated grease must first be removed from the bearing internal volume before adding the required amount of fresh grease. Not a simple thing to do properly with some bearing installations.