a 30mm wide keyway by 16mm deep and i was using a 12mm solid carbide cutter taking 5mm deep cuts each time
And just how many kW were being pulled by the cutter?
That sounds wildly over-loaded to me. It's a wonder the cutter survived.
But then, I don't know how big the Doosan is.
Was the shaft FULLY supported at the site of the cut? Really fully?
Cheers
Roger