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grease for high speed precision bearings

cuslog

cuslog

Super User
Premium Member
KO Lee Tool & Cutter grinder, older model. Spindle a bit noisy, thinking the grease may just be dried out, need cleaning and re-lube. As I understand it these are a class 7 precision bearing and these could run anywhere from 1740 up to over 20K rpm for internal grinding. I've changed / greased lots of bearings in my time but never dealt with precision bearings.
Wondering about what grease, where to access etc. Other tips / comments welcome too.
TIA
 
Isoflex NBU 15 by kluber is what I used on the last bearings for a surface grinder.
More importantly the fill amount of the bearing matters more IMO then the grease it self.

Too much and it'll simply push it out while it overheats, Having to start the re-grease or repack all over again.
I aim for 25 to 40% grease of the free internal space of a bearing, Never actuality measured the free space, But you get the idea. Visually.

I used a syringe and squirted it between the races/balls.

I think there are online calculators on how many CC\s are required.
I will do some googling.

Gluck
 
If you're a vid kinda guy, Rotary SMP on YouTube has a couple of good videos on repacking bearings. I'll try and post a link but they should be easy to find IIRC he did one about 4 months ago.
 
I used SKF Bearing grease “LGLT 2/0.2 Low temperature, extremely high speed”, on my Ingar surface grinder spindle bearings. I used it because it was easy to get (Motion Industries), but Kluber products were harder for me to get. +1 on using a syringe. I think it cost about $50.

The challenge I found was how to assemble everything without putting installation loads through the rolling elements. I ended up making specialty tooling (no room for hook wrenches, no hammering on the slot nuts, etc. - really think it through). I was replacing the bearings as the as found were not proper spindle bearings (the dimensions are the same as some common small motor bearings - cost about $20). I then had to research for the correct ones - and, “yes” they were expensive (~$500). Putting hours into making tooling seemed like a good plan.

Your situation is more complicated because you intend to reuse the bearings - so you’ll be ensuring there is no risk to the bearings (i.e. not loading through the rolling elements).
 

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