9 MILLING GRADES – OVERVIEW Substrate H WC-Co based substrate submicron H WC-Co based substrate, fine-grained (< 1 µm) ultra submicron H WC-Co based substrate, very fine-grained (< 0.5 µm) S Substrate with cubic carbides Coating MT-CVD Medium-temperature chemical method of coating PVD Low-temperature physical method of coating × Uncoated grade Coolant Benefit --- Very negative effect on tool life – cooling is not recommended - Slightly negative effect on tool life +/- Influence of cooling may be both positive and negative – decisive factor is specific working conditions ++ Positive effect on tool life – cooling is recommended Attribute Strength Level 1 – 5 767