Repacking Tesla / SKF Rotor Hybrid Ceramic Bearings 

I show that in one of my previous videos.

No I re-used the old ones and I "repacked" them with fresh new grease.

@@diyEVguy Thanks for the answer! One more question. In this motor, have you seen such a "brush!? Its condition? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VW4_ICHFTM0.html

They are extremely expensive, unless the bearing is trashed and gritty I wouldn't replace it if the seals can be removed and reinstalled without damage.

@@FrozenHaxor Because of this, I would never trust you to repair my vehicle: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VW4_ICHFTM0.html

+ ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-C8oxv7ILcHU.html

See here about that seal: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wwuJc5iBP2M.html

Which specific grease would you recommend?

@@diyEVguyMaybe Kluber BF-7222.

@@diyEVguykluber nbu 15 or kluber 72 42

and also 7222

Yeah NBU 15 is very good ​@@spindlehospital5263

@@vers21 why exactly?

Where to buy cheap?

I could imagine bearings for a motor like this wouldn't be cheap but not crazy expensive. Maybe $50 a pop

I don't have experience in motor design. Do you happen to have references to designs examples with similar conditions as this motor where high precision roller bearings are shown to be a better choice? Also which needle bearings would you recommend?

@@diyEVguywell the examples are the many aircraft piston engines for example Mercedes Benz DB601-605 series in WW2. Look up DB601 +bearings '+cutaway you'll see a cutaway of crank to conrod bearing is roller bearings. Also the maybach powerpack for the various tanks had roller bearings. You need to give me the bearing and number so I can cross reference it with an NSK or SKF chart or you can look up pedfs of SKF, Timken, NSK whoever you use spec charts. Efficiency improvement above 5% is possible- 5% more torque and power sound good enough for me to shell out for some proper bearings instead of the crud Tesla use. Proofs: "The roller bearing engine: A cost effective way to reduce fuel consumption" by Christof Tiemann, Markus Kalenborn, Kolja Orlowsky, Christoph Steffens & Werner Bick 1 April 2005 MTZ worldwide: "Pure Efficiency: Developing combustion engines from the perspective of a supplier:" Dr Martin Scheidt & Matthias Lang "Roller-Bearings in Combustion Engines - an Effective Way for . "Evaluation of a Low Friction, High Efficiency roller Bearing Engine"- the Timken Compnay proj. mngr Charles W. (Skip) Shattuck Conclusion: "The test results measured when the engine was powered by an external motor confirmed the results of earlier studies which showed that application of roller bearings to an ICE does reduce friction, although the 5-10% reduction was less than the amount seen in other studies." "Crankpin Bearings in High Output Aircraft Piston Engines The Evolution of their Design and Loading" by Robert J. Raymond, July 2015 Aircraft Engine Historical Society

​@@markiobook8639 The Tesla motor needs hybrid ceramic bearings (ceramic balls in metal races) due to the "common mode" voltages created by the variable frequency drive. Maybe ceramic balls were more widely available. Also the radial loads are relatively low and the speed is very high (>10,000RPM). From the perspective of load bearing capabilities, a line contact from needle bearings may not be needed.

@@diyEVguy You may be correct their I was wondering why ceramic bearings at all since it's not a high heat application- yes I think you may be right about insulation properties- perhaps metal bearings arc or have the potential to arc- no good for lithium battery packs.

No way, these "nano-ceramic" coated bearings are made to be non-conductive. The first non-conductive high-speed motor bearings ever created. At the speeds the Tesla motors are capable of, 16000+ rpm, It appears that high current arcing causes all other types of conductive bearings to fail.