hammer drill

rotary hammer drill

Amateur craftsmen are often faced with a dilemma: what to buy for home – Impact Drill or Hammer Drill? Both tools are designed for drilling. Both have a kick function. I also have written a post on the best rotary hammer drill.

The question is not which is better – but what tasks do you need the tool for. After all, it is one thing to drill hundreds of holes every day, gouge reinforced concrete, make holes for sockets, and quite another thing to drill a wall every couple of months to hang a shelf or cornice. An unsuitable tool will either fail quickly or lie unnecessarily. That is why it is worth figuring out how an impact drill differs from a hammer drill. Let’s start with how it works.

Why You Should Choose the Hammer drill

Principle of operation and features

  1. The hammer drill differs in the impact mechanism. The drill is based on mechanics – the friction of gears. The impact is weak, with a small amplitude. This is compensated by a high frequency (about 30-50 thousand beats per minute). When working, you need to press hard on the tool.
  • The impact of the perforator is realized by pneumatics (a piston moves in the cylinder, transmitting movement to the firing pin). The amplitude and energy of the impact are high, and no additional effort is required. The frequency of blows, on the contrary, is relatively low (up to 4-5 thousand per minute).
  •  Operating Modes. With a drill, the blow complements the rotation, i.e. the first is impossible without the second. There is also simple drilling. Rock drills usually have 2 or 3 modes: hammer drilling (main), non-hammer drilling and chiseling (clean hammer).
  • Efficiency. With equal power tools, the capabilities of the drill are much more modest. In other words, to drill the same hole as a hammer drill, the drill will consume 2-3 times more energy. And there is something that she is not at all capable of.

Differences in application

Impact drill “in the teeth” brick, foam concrete, other types of lightweight concrete. But drilling these materials will be slow and time consuming. The reason is that the impact energy of the drill is low. What is convenient is to drill wood and metal, as well as tighten the fasteners.

The hammer drill is most effective when drilling concrete or stone. If you work with it on wood or metal, then the holes are not as accurate as when drilling with a drill. For these works, a cam chuck is installed in the hammer drill chuck, but beating is still present.

The “native” equipment for the perforator will be crowns, chisels, spikes, blades. This is “heavy artillery” for the respective tasks. You can, for example, remove tiles or hammer grooves.

Comparing Tools

A standard screwdriver/ drill uses an electric motor to apply torque to a screwdriver bit, thus turning the screw. A gearbox is almost always involved. The key here is that the electric motor provides the torque directly.

In a hammer drill, part of that torque is used to drive a cam mechanism to move the bit back and forth on its longitudinal axis. This means inside and outside the screw. This is mainly useful for drilling hard materials like ceramic, concrete, masonry. This is NOT a feature that would generally be desired to turn a screw.

An impact driver or impact wrench (power tool) uses a rotating mass to engage / disengage the shaft of the bit, each time it is struck. Think of it this way: you have a regular wrench attached to a bolt. It would be easier to spin a hammer in a circle and have it land on the key and deliver a short, sharp, heavy-duty blow; than using the same torque / effort you used on the hammer on the wrench directly.

It’s basically a way of trading speed for torque that also has a beautiful side effect of reducing reaction forces in the body of the tool, meaning your wrist doesn’t have to resist torque as much. This is beneficial for driving screws all day:

An old school MANUAL impact driver has nothing to do with modern power tool impact drivers. Basically, you put the impact driver on the screw head and hit it with a hammer, the hammer hit keeps the bit embedded in the head and the internal mechanism converts part of the longitudinal translation (hammer hit) into torsion around the length shaft (by turning the screw). The idea is to avoid CAMOUT or peeling the heads. It’s usually only important these days for Phillips screws.

Differences between rotary hammer and rotary hammer:

Not all exercises are up to the task to satisfy you. To obtain maximum torque, an exceptional drill is required with various types of compositions such as dense wood, softwood and various metals. But to interrupt the concrete, you can opt for a rotary hammer or rotary hammer. The area unit of the inhabitants of the house largely ignores the hammer drill. Inconsiderably, you would like to understand the variations whether or not you have a task with it or not.

The difference is really in those issues.

  • Characteristics and their differences.
  • Hammer factors and their differences
  • Chuck factor and its differences
  • Tool style and its differences.
  • Do not go over a hole: compare
  • Never press hard, compare
  • Keep debris away, compare
  • Small hole deserves first drilling – compare


Impact drills and hammer drills may look very similar to each other, but differ primarily in purpose and in some operations. A hammer drill is most often used to drill holes in a hard surface such as brick, concrete, and masonry to install fasteners and other construction equipment.

Rather, the primary function of an impact driver or impact drill is to drive screws into walls. Regarding the operation too,

Hammer drilland impact exercises differ from each other. The hammer drill uses much more pressure than an impact drill. It is almost like a hammer working fast in a back and forth motion.

On the other hand, impact drills use heavy-duty blows accompanied by rotating bits to drill holes in heavy, dense materials such as concrete and hardwood. To cut a long story short, hammer drills and impact drills can vary considerably. However, there are some hybrid versions of rotary hammers that accomplish the functions of both variants reasonably well.


So which hammer drill or hammer drill to choose? Let’s summarize the main points:

Impact Drill – small impact force. Can drill brick and concrete, but the efficiency is not very high. This consumes a lot of energy. Not recommended for intensive work. Frequent hammer drilling will wear out the impact gears.

Hammer Drill – you can drill and hammer in concrete of any density, stone, brick. The crown allows for fairly wide holes. Some models have a jackhammer function. If necessary, you can drill wood and metal, but a) with low accuracy; b) not very convenient (due to the heavy construction).

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