When renovating an apartment and a house, probably one of the most demanded power tools is a hammer drill due to its versatility, for drilling solid materials ( concrete, brick, metal), soft materials (plastic, wood), chiselling, for example, beating tiles.
In this article we will consider the question of which punch to choose.
Perforators are divided into household small power from 450 W to 1000 W, small in weight from 2 to 4 kilograms, with an impact force from 2 J to 3.5 J, and professional from 1000 W to 3000 W and weighing up to 12 kilograms, with an impact force from 4 J to 20 J.
Rotary hammers also differ in the type of engine location, these are:
Horizontal arrangement is the most common and used in household rotary hammers.
Such a scheme is the most compact and convenient for work, however, the disadvantage is the increased shock load on the engine and the worst cooling. Impact mechanism, usually using an oscillating bearing.
The vertical arrangement of the motor is usually used for professional tools, due to the reduced shock load on the engine. Has better cooling, which allows more intensive use of the hammer drill. The impact mechanism, in most cases, is a crank-connecting rod.
Impact mechanisms with the use of an oscillating bearing, and a crank-connecting rod are pneumatic shock mechanisms and have a self-shutdown function at idle.
Modern hammer drills usually have 3 operating modes:
Hammer drills most often have two or three modes , single-mode, as a rule, this is a professional tool sharpened only for drilling with a blow and does not have additional devices and mechanisms and, as a result, is more reliable and durable.
Most widespread received two types of cartridges: SDS + and SDS max . Basically, they are no different from each other and represent a system when the splines of the chuck cover the drills with grooves on the shank. The only difference is that the sds + chuck uses 10mm shank bits and the sds max uses 18mm shank bits.
To prevent tool breakage and damage to the person using the tool, a safety clutch is used when the drill gets jammed. There are two types of clutches: friction and spring-cam .
Friction clutches consist of discs pressed against each other and transmitting rotation. At the moment of jamming, the discs slip, disconnecting the shaft from the chuck.
Spring-cam consists of two coupling halves.
The half-couplings with teeth are pressed against each other by a spring. When the drill gets jammed, the resistance begins to exceed the spring force, the teeth begin to slip, and a characteristic crackling sound will be heard. It is believed that spring-cam are more reliable than friction ones. Their downside is tooth wear.
As a rule, a collector-type motor is used.
Also, on most models, a so-called reverse scheme is used (it can be used as a screwdriver).
Most often, the body is made of several materials. It is metal (aluminum alloys), hard plastic, soft plastic.
Vibration protection systems are divided for active and passive .
Active Systems (AVS) are installed on powerful models.
It is a shock-absorbing device, a counterweight with a spring that absorbs the recoil.
Passive system is a set of all possible rubberized pads, handles, which, in addition to anti-vibration properties, allow hands not to slip.
So, having considered the technical parameters, I would like to touch upon one more important parameter: the cost of the tool.
The cost of a household tool starts from $ 50 to $ 250. The cost of a professional tool reaches $ 1000.
Nevertheless, you should not buy the cheapest one, even if you are not planning a global apartment redevelopment. Most likely, it will not last you long, and in case of intensive use it will not be able to help you at all. Take a closer look at the mid-range rotary hammer.
For almost all work that may arise on the renovation of an apartment, it will be enough hammer drill from 1000 W to 1500 W with horizontal engine.
This will allow working in narrow places, impact energy 2-3.
5 J. A pleasant bonus will be the ability to have three modes of operation and reverse.
The cordless hammer drill is especially popular, the advantages of which include high mobility. No need to drag wires, it is possible to work in places where there is no power supply.
The disadvantages include the fact that the battery lasts about 3 hours of operation, then charging is required.
Another disadvantage will be that the batteries are not eternal and the approximate service life is from one to two years.
( 1 grade, average 5 of 5 )
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