As rock condition is a key factor to cutters selection. The following is a table of rock condition. Rock Compressive Strength Sd（MPa） Tensile trength Sz (MPa) Characteristics min. average max. min. average max. Sandstone 25 170 320 5.1 17.3 30.7 High abrasiveness, massive Siltstone 30 95 180 4.1 8.5 19.0 Low abrasiveness, inhomogenous Basalt […]
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