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Indeed. That metal dust is some tough stuff to breathe.

I'm curious, why do you not want to spin up the cutter before touching the surface?

Thanks.



Mask = a good idea. especially on exhaust ports of used heads.
You'll probably still have black snot with a mask , but your lungs will thank you.
I've always done cast iron dry.
Carbide likes coolant , but lubrication , not so much.
A spray bottle of water based machining coolant / lube would be my choice if I used anything.
On aluminum , a shot of silicone ( W.D. 40 or similar ) on the burr periodically really helps cut down on the aluminum in the flutes of your cutter...........they will load up quick even with the more open cutters designed for aluminum. W.D. really helps here.