drill bit diameter increases from smaller to bigger during drilling operation, mean while we have calculated the Specific energy. but when the drill bit diameter increases, specific energy decreasing, what is the reason behind this operation.
specific energy is related to the area of the drill bit when drilling, thus it will decrease when the diameter increase. It is important to not that for hard materials the drilling depth should not exceed the diameter of the drill bit, otherwise you should pause. so if you are using computer aided manufacturing you can write your G code to pause depending on the materials.
FYI, this is the basic equation:
MSE=(4 × WOB)/(〖Dia〗^2 × π) + (480 × Tor × RPM)/(〖Dia〗^2 ×ROP)
Split in to axial and torsional work performed to break the rock.
-Teale, R. The Concept of Specific Energy in Rock Drilling, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts Vol 2, Issue 2, pp 57-73, July 1965
Again you can also read these articles and you will find that the decrease is nonlinear. therefore writing a specific program for advance drilling is important. just repeat the cycle and pause and you will OK.
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