Abstract
A rotary-percussive rock drill was tested for wear under dry conditions when drilling granite, dolerite and diorite. Granite caused more rapid wear of drill bits than either diorite or dolerite but there were significant differences between diorite and dolerite despite their similar geological composition. Microscopy of the worn drill bits revealed that wear occurs by micro-spalling for all rocks and macro-spalling for granite. No evidence of abrasion was found, contrary to previous findings, and the difference between various parts of the drill depended on the scale of spalling.
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