Abstract
A report is given of laboratory tests with regard to wear by rotary drilling, percussion drilling, rotary-percussion drilling and rotary drilling with roller bits in rock. Preliminary tests were performed with cone-shaped tools, which worked on the surface of the rock in a rotary and percussive manner; this method was not completely satisfactory, however. In a second step, therefore, new testing machines were devised for each of the 4 drilling systems, with which, for each method, the typical motion conditions and pressure conditions could be imitated on a small scale in a manner similar to real drilling. By means of these new testing machines the fundamental laws of wear and drilling rate for the drilling in rock with each of the 4 drilling methods could be determined and set out clearly; in many cases there was good conformity with practical experience.
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