| DEWALT Cordless HammerDrills DC926VA Heavy-Duty XRP™ 18V Cordless Hammer Drill / Drills / Driver Kit w/ Vehicle Charger, HammerDrill |
| DEWALT Cordless Hammer Drill DC925KA Heavy-Duty XRP™ 1/2" (13mm) 18V Cordless Hammer Drills / Drills / Driver Kit, 18V HammerDrill |
| DEWALT Cordless Hammer Drills DC926KA Heavy-Duty XRP™ 1/2" (13mm) 18V Cordless Hammer Drills / Drill / Driver Kit, 18 Volt Hammer Drill |
| DEWALT Cordless HammerDrill DC985VA Heavy Duty XRP™ 1/2" (13mm) 14.4V Cordless Hammer Drills / Drill / Driver, XRP Hammer Drill |
| DEWALT Cordless HammerDrill DC984VA Heavy-Duty XRP™ 14.4 V 1/2" (13mm) Drill / Driver Kit, HammerDrills |
| DEWALT Cordless Hammer Drill DC984KA Heavy-Duty XRP™ 1/2" (13mm) 14.4V Cordless Hammer Drills / Drill / Driver Kit, 14.4 Hammer Drill |
| DEWALT Cordless HammerDrill DC989VA Heavy-Duty XRP™ 1/2" (13mm) 18V Cordless Hammer Drills / Drill / Driver w/ Vehicle Charger Kit |
| DEWALT Cordless HammerDrill DC989KA 18V Cordless Hammer Drills / Drill / Driver Kit, 18 Volt Hammer Drill |
| DEWALT Cordless Hammer Drill DC988VA Heavy-Duty XRP™ 1/2" (13mm) 18V Cordless Hammer Drills / Drill / Driver w/ Vehicle Charger Kit |
| DEWALT Cordless HammerDrills DC935KA Heavy-Duty XRP™ 1/2" (13mm) 14.4V Cordless Hammer Drill /Drill / Driver Kit, Battery Powered Drill |
| DEWALT Cordless Hammer Drills DC936VA Heavy-Duty XRP™ 14.4V Cordless w/ vehicle charger, Hammer Drill |
| DEWALT Cordless Hammer Drills DC935VA Heavy-Duty XRP™ 1/2" (13mm) 14.4V Cordless Hammerdrills / Drill / Driver with vehicle charger |
| DEWALT Cordless HammerDrill DC925VA Heavy-Duty XRP™ 18V Cordless Hammer Drills / Drill / Driver Kit w/ Vehicle Charger, 18V XRP Drill |
| DEWALT Cordless Hammer Drill DC936KA Heavy-Duty XRP™ 1/2" (13mm) 14.4V Cordless Hammer Drills / Drill / Driver Kit, HammerDrill |
| DEWALT Cordless HammerDrills DC988KA Heavy-Duty XRP™ 1/2" (13mm) 18V Cordless Hammer Drills / Drill / Driver Kit, 18 Volt Hammer Drill |
| DEWALT Cordless Hammer Drills DC985KA Heavy-Duty XRP™ 1/2" (13mm) 14.4V Cordless Hammer Drills / Drill / Driver Kit, Hammer Drill |
| DEWALT Cordless Hammer DC212KA Heavy-Duty 18V Cordless 7/8" SDS Rotary Hammers, Rotary Hammer, SDS 18V Drill, Hammers |
| DEWALT Cordless Hammer DC233KL Heavy-Duty 36V Cordless 1" SDS Rotary Hammers, Hammer SDS, SDS 36 Volt, SDS 36V Hammer |
| DEWALT Cordless Hammer DW999 Heavy-Duty 7/8" (24mm) 18V Cordless SDS Rotary Hammers, Rotary Hammer 18V SDS Drill |
| DEWALT Cordless Hammer DW005 Heavy-Duty 24V Cordless SDS Rotary Hammers with Chipping Function, SDS 24V Drill Hammer |
| DEWALT Cordless Hammer DC223KA Heavy-Duty 24V Cordless 7/8" SDS Hammers, SDS 24V Hammer, Rotary Hammer 24V Drill |
| DEWALT Cordless Hammer Drill DC910KL Heavy-Duty 1/2" (13mm) 28V Cordless Hammer Drill / Driver 28 Volt HammerDrill |
| DEWALT Cordless HammerDrill DC927KL Heavy-Duty 1/2" (13mm) 18V Cordless HammerDrill / Drill / Driver/ 18 Volt Hammer Drills |
| DEWALT Cordless Hammerdrill DC725KA COMPACT 1/2'' (13mm) 18V Cordless HammerDrill Kit, 18 Volt Hammer Drills |
| DEWALT Cordless Hammer DC228KL Heavy-Duty 28V Cordless SDS Rotary Hammer Kit |
| CORDLESS HAMMER DRILLS, SDS ROTARY HAMMERS |
| A cordless drill is a type of electric drill which uses rechargeable batteries. These drills are available with similar features to an AC mains-powered drill. They are available in the hammer drill configuration and most also have a clutch setting which allows them to be used for driving screws. For continuous use, a worker will have one or more spare battery packs charging while drilling, so that he or she can quickly swap them, instead of having to wait several hours during recharges. Early cordless drills started with interchangeable 7.2V battery packs, and over the years the battery voltage has been increased to 18V, and higher, allowing these tools to produce as much torque as many mains-powered drills. The drawback of most current models is the use of nickel-cadmium (NiCd) batteries, which develop a memory effect or internal short circuits due to dendrite growth, severely limiting their useful life, and posing a hazardous materials disposal problem. Drill manufacturers are now introducing lithium ion batteries, most notably DEWALT. The main advantages are lack of memory effect and very short charging time. Instead of charging a tool for an hour to get 20 minutes of use, 20 minutes of charge can run the tool for an hour. Lithium-ion batteries also have a constant discharge rate. The power output remains constant until the battery is depleted, something that nickel-cadmium batteries also lack, and which makes the tool much more versatile. Lithium-ion batteries also hold a charge for a significantly longer time than nickel-cadmium batteries, about 2 years if not used, vs. around 4 months for a nickel-cadmium battery. Hammer Drill The hammer drill is similar to a standard electric drill, with the exception that it is provided with a hammer action for drilling masonry. The hammer action may be engaged or disengaged as required. The hammer action is cheap but delicate. It uses two cam plates to make the chuck accelerate towards the work. However because of the relative masses of the chuck+bit and the remainder of the drill the energy transfer is inefficient and will fail to penetrate harder materials and vibrates the operators hand. The cams wear quickly. Compare this to a rotary/pneumatic hammer drill where just the bit is accelerated to the work. They have relatively little vibration and penetrate most building materials. It feels as though the work is sucking the bit inwards. Large cam hammer drills, especially transverse motor, are crude in their action. The energy delivered in each stroke is highly variable. The cheaper drill will smash its way through the work and vibrate the surroundings, this can cause lots of collateral damage. A good SDS drill will gently pulverise the work material just in front of the bit and glide into the hole without any "fuss". However there is a big difference in cost. In the UK typically £12-40 for a cam hammer and £100 up for a rotary/pneumatic. For light DIY use they are fine. Rotary hammer drill The rotary hammer drill (also known as roto hammer drill or masonry drill) is an electric drill type dedicated to drilling holes in masonry. The rotary hammer drill is a percussion drill that uses a weight to create the impact force on the masonry bit. Generally, the drill chuck of the rotary hammer drill is designed to hold SDS drill bits. Some styles of this drill are intended for masonry drilling only and the hammer action cannot be disengaged. Other styles allow the drill to be used without the hammer action for normal drilling. |
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