This rubber cup is called a spawl shield. Rotary hammer manufacturers provide a rubber cup that fits over the end of the chuck and minimize the amount of material that is able to break off and fly away. To minimize spawling, you first need to decrease the amount of pressure that you’re using on the drill. Model Number: Ryobi P251 Depth: 8 Height: 8.125 Width: 3. Ryobi P251 18V One+ Brushless Hammer Drill Specs. This can be dangerous because these pieces are often quite sharp and can cause bodily injury. Overall, Ryobi’s brushless hammer drill is a fantastic choice to tackle nearly any DIY project that calls for a hammer drill and a low-cost option to keep your crews running at the Pro level. Spawling is where chips of the material being drilled break and fly off the material while it is being worked. If your first attempt isn’t successful at breaking the rock, use more force with the hammer. Insert a pointed rock punch or concrete nail in the hole and strike it sharply with a hammer a couple of times to break the rock. Impact Driver, (2) 18V High Performance batteries, charger.
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