You will also need a water supply to cool the coring bit as it cuts. One method is to inject a steady stream of water on the cut. Another is to create a dam around the cutting area with glazier's putty. NEXT

You will also need a water supply to cool the coring bit as it cuts. One method is to inject a steady stream of water on the cut. Another is to create a dam around the cutting area with glazier's putty. NEXT