I have a 1.5kw spindle, at least 16k rpm, possibly 24k. On the shaft above the collet is what I assume is a flywheel. I'm considering adding a squirrel-cage like fan or rotor to the shaft to pull a vacuum for chip removal. I'll also need to mount a removable shield (to allow for tool change) to the spindle housing, to connect a vacuum hose for chip evacuation. The shield will need to be adjustable height to extend downward to restrict air intake to just above the surface of the material being cut.
If I mill the rotor out of aluminum, what diameter could I go to before I'm in danger of it disintegrating at max rpm?
I'm assuming that chip collision will degrade the vanes eventually but I'm guessing I may need to try different designs anyway.
Anyone ever done this or have any ideas?

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