GarDouth
Administrator
Drilling shot holes in the soft Jurassic limestone of the North York moors has proved problematic. The issue is that once you get about 400mm in, the rock is so soft and porous that the dust turns into a kind of paste which the drill bit can't expel. The sludge and suction in the hole prevents further drilling even with extra plunging.
Does anyone have any suggestions? A particular type of drill bit that might be better or some other way to get a 10mm hole deeper in this crappy rock.
Does anyone have any suggestions? A particular type of drill bit that might be better or some other way to get a 10mm hole deeper in this crappy rock.