Kavo use air to keep coolant and debris out of the bearings, not to cool them. At 50K RPM any normal packing will burn up, so there is a labyrinth seal instead. The cooling is by a mounting block with water running through it. Similar to the CPU-coolers.
Why not try it? The cost of 3 bearings is not that great. They will wear fast, but how fast? I would put in a thermistor very close to the bearing to monitor it's temperature. When it rises, you know you should back off. Also when it starts to heat up faster than it did before, you know it's time to order new bearings.
Don't use springs to set up preload. It needs to be rigid. The high precision beraings I've come across have the preloading built in. That's one reason they need to be a matched pair. You tighten both the inner and the outer races against each other. |