A hammer drill is a rotary drill with hammering action. When it is equipped with a masonry bit, it is designed to drill into concrete, stone, mortar or brick. In case of operation of a hammer drill, it rotates like a normal drill as well as has a hammering, forward type of action.
Hammers drills are powered either by electricity or by batteries. Demolition hammers use the same technology. Hammer drills are available in cordless or corded format. Following are the major types of hammer drill machine:
In case of a dedicated hammer drill, sometimes referred to as a rotary hammer is a specialty tool that is used when you require a lot of masonry drilling. Sometimes, a better option is to rent this machine as especially a DIY project will not find it profitable or cost-effective to buy.
Corded Drill Using Hammer Option
When you have access to an electricity outlet, a good option will be a corded drill with a hammer setting as you would not need to worry about using charged batteries. These also tend to have more power and higher RPM.
Cordless Drill Using Hammer Option
Cordless hammer drills are very useful, when you do not have access to electricity nearby. The most trending 18 plus volt models have power that amounts to corded tools. In case, you are not drilling hundreds of holes at one time, the best options are these cordless marvels.
Units of lower power tools are usually called ‘hammer drills” which typically have a ‘percussion’ or ‘cam action’ hammering mechanism. In this, two sets of toothed gear mechanically interact with each other to hammer while rotating the drill bit.
These units are relatively smaller and typically powered by cordless technology. They are not used usually for production construction drilling but only for occasional drilling of masonry or concrete.
Advanced power units are typically bigger and offer a more powerful impact force by making use of a technology called as ‘Electro-pneumatic’ (EP) mechanism of hammering since it is powered directly by electricity and does not use a different air compressor.
An EP hammer features two pistons- a flying piston and a drive piston. A crank is turned by an electric motor, which in turn moves the drive piston back forwards and backwards in a cylinder. The flying piston is located at the other end of the same cylinder. These pistons do not really touch, but air-pressure in EP cylinder results in more hammering energy.
Referred to as also-‘combi drills’, rotary hammers have the same action as to pound the drill bit in and out while spinning. But they use a pistol mechanism in place of a special clutch. As such, they deliver a much more powerful hammer blow, enabling the drilling of bigger holes much faster.
These hammers cause such impact that the usual bits of masonry are no longer adequate. Their smooth shanks could be pounded loose form the chuck of the tool within seconds. Besides the major function of drilling concrete, rotary action can be switched off and only the percussive force, made use of.
These are all the major types of hammering machines.