Facing/Boring/Drilling/ multiple ops on Meat Slicer Basins using 2 Pallet, Okuma MH60, horizontal 50T, probably 5000/6000 Series aluminum alloy causing a high pitched squeal/chatter while routing a hole resulting in excessive harmonic frequency eventually caused the races' in bearing housing to crack locking Spindle Up. I decided to call service in and also found rotor shaft distorted needing eventually turned .003....$16,000. Coolant good, bits are good, fixture clamping tight, Speed, Feed?? not sure. they decided to keep on running the same. Any comments??
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