Button Bits Are For Hard Rock Drilling
2019-8-9 · Plinninger developed a negative linear function for the assessment of lifetime (meters/bit) of button drill bit (Ø = 45 mm) based on CAI values. Later, Plinninger ( 2008 ) proposed an improved decreasing exponential model for the estimation of working life (meters/bit) of button drill bit (Ø = 45 mm) with CAI values.
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