Less common or less studied vegetable oils that have been investigated as sources of biodiesel include Cynara cardunculus (Castillian thistle) (11), rubber seed oil (12), karanja (Pongamia glabra) and nahor (Mesua ferrea L.) oils (13), Cuphea viscosissima (14), and Jatropha curcas L. (15), tobacco seed oil (16) as well as other non-conventional
tipped pcbn inserts with brazed cbn cutting edges are used for machining ferrous hard metals such as nodular cast iron, hardened steel, high speed steel, die steel, bearing steel, cemented steel, heat resisting steel, carbon tool steel, chromium and nickel molybdenum alloy. the working tips of cbn inserts are made by pure polycrystalline cubic boron nitride, cbn tipped inserts are
