JK930 Crawler DTH Rock Drill with Dust Control Quarries are being pushed hard on dust, and dry drilling is where most of the complaints come from. The JK930 handles it with a cyclone separator that pulls roughly 85% of the coarse dust out of the return air on its own, plus an onboard water injection pump at the swivel for benches where silica is the real issue. You can switch between dry and wet depending on the rock and the rules on site. Runs all day on the bench Under the
