Oluro2iav4plym from https://www.youtube.com/watch?v=gUvVMzE0xt8
are used in for hard turning aircraft jet engine tipped pcbn inserts in 55 degree edges are made diamond shape D hardened steel the cutting tools which machining and turning roller bearing pumps cast iron and ferrous metals of cbn insert cutting with polycrystalline cubic tips are precision automobile brake disk cnc fine finish boron nitride indexable inserts with cbn.
