Hi all,

Using a slitting saw (3-1/2" x 1" 1mm thick and approx 140 teeth) on the mill, conventional milling into aluminium (unknown grade) and doing approx 600 rpm using WD40 generously for lube and chip clearance.

All going reasonably well and the bang!

Spindle stalled and bits of HSS slitting saw shatters and flies in all directions.

I never did trust it and so was wearing a full face shield.

What did I do wrong?



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