Estimate the service time of rock drilling rods by its abrasion level from surface
Dec 11, 2015
The service time of a drilling rods can be preliminarily assessed from its surface abrasion level. Certain feed length can be made after the hexagonal prism diagonal nadir of the rock drilling rods is abraded down to 24 mm.
A conception of hexagonal prism diagonal nadir is introduced here. Compared with the rock drill bits by diameter of Φ32~Φ50, the diameter of rock drilling rods with B22 mm is much smaller, so that the body of rock drilling rods would not touch completely with the internal wall of the hole of rock drill bits . Therefore, there is no need to wait all the hexagonal prism diagonals abraded to 24mm before its retirement.
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