Which hammer drill is better vertical or horizontal
How to choose a hammer drill, which model is better
Any electrician is periodically faced with the need to lay electrical wiring inside concrete or brick walls, which have to be drilled or grooved. It is more convenient to perform such tasks with a specially designed puncher.
In order to successfully choose its model for work, we suggest that you familiarize yourself with the features of various designs and the list of technical solutions for their execution, embodied in the various designs of perforators produced by modern manufacturers.
The perforator is created for making holes in concrete, brick, stone building structures of increased strength by applying mechanical blows to a nozzle performing a combined translational-rotational motion.
Additional tasks of the punch are:
drilling holes in various materials using the drill function;
application of a continuous series of axial blows in the mode of a jackhammer.
Like all modern instruments, it is given the possibility of multifunctionality. Using a different set of special attachments, they can:
prepare various mortars;
to clean the surfaces of metal, stone, concrete;
How the hammer drill bit works
Tools that create holes in the walls of building structures, including rotary hammers, are created with different technical solutions.
How an impact drill works
The constructive difference from a conventional drill is that it inflicts a lot of small axial beats during operation due to the use of a mechanical gear device.
The upper part of the shock structure consists of a fixed gear with a complex relief of the contact plane, and the lower one, which receives rotation from the electric motor, is connected to the chuck of the working body. At its contacting contact end, the same relief gear is mounted, which can:
be separated from the upper part by inserting a metal retainer, as shown in the picture;
If the retainer is inserted, then it excludes the contact of the relief mechanisms: the drill works in the mode of smooth drilling without committing axial impacts. When the beating mode of the chuck is set by removing the retainer, the energy of the electric motor turns the movable gear along the depressions and protrusions of the stationary one, and due to this, the chuck is given axial movements.
In this case, the user needs to press on the body of the device and abut it against the part to be drilled in order to create contact of the discs with embossed surfaces.
How a puncher is struck
To impart axial displacements to the working body, two types of drive mechanisms are used:
The impact of the first method is based on the interaction of two coils, which form oppositely directed electromagnetic fields, which are created at different times and act on the core, forcing it to move cyclically back and forth. At the same time, he hits the end platform of the working body.
Most often, in the designs of modern rock drills, a drive is used that works according to the electro-pneumatic method. In it, the axial movement of the working body occurs due to the application of direct piston blows to the end face of the head. It uses one of two technologies:
In both designs, the piston moves inside the air space limited by the cylinder between the pusher hammer striking it and the end of the working body. In this case, the air is compressed by the piston and transfers energy with a sharp blow.
After that, the piston bounces off, and the pusher, returning back, quickly creates an additional vacuum in front of it.
Depending on the design of the mechanisms, the piston makes progressive and reciprocal movements with different frequencies and transfers the energy of the pusher to the working body without a rigid mechanical connection between the electric drive and the actuator (through the intermediate air medium).
Due to this technique, the impact of the working body requires less power application than that of an electric drill. Therefore, rock drills work more efficiently, consuming less energy in chiseling mode.
For safety reasons, pneumatic impact mechanisms are usually equipped with an idle cut-off function when the working body is not pressed against the work surface.
Rotary hammer drills
These designs use the transmission of motion to the piston pusher due to the swinging “drunken” bearing mechanism, which receives rotational energy from the electric motor and converts it into axial impacts.
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For this, a support bearing of the working shaft is installed on the drive sleeve, which is put on the lever. A protective cover is installed inside the outer and inner rings of the cage, which covers the steel balls. the swing body.
There is a groove on the shaft that acts as the inner ring of the bearing. Due to this technique, the lever oscillates only in the axial direction, making the piston pushes.
The number of reciprocating vibrations of the nozzle is directly proportional to the speed of rotation of the rotor of the engine, and the amplitude of movement is influenced by:
design of the maximum angle of inclination of the bearing to the shaft axis;
Rotary hammers with crank
The location of the engine in a perpendicular plane to the axis of movement of the working body allows you to use a simple crank mechanism for reliable operation of the rock drill.
Due to the crank, the rotational movement of the engine is converted into a reciprocating oscillation of the pusher, and the latter makes periodic blows to the piston.
How the tip is rotated
In order for the working body in the chuck to perform, in addition to blows, a rotational movement in the structure of the perforator, mechanisms are used that transmit the rotation of the nozzle from the engine. One of the ways to implement this method is shown in the picture.
Chain drive and bevel gears work in vertical engine models.
What to consider when choosing a rock drill
All models, according to their technical capabilities, are classified into three main groups:
household appliances that allow you to perform various repair work from time to time at home;
professional designs designed for continuous daily use within eight hours of a working day;
industrial devices capable of continuous long-term operation, taking into account the shift use by various workers.
BEST ROTARY HAMMERS!
The quality of the mechanisms, the perfection of the operational algorithms and the complex optimal ratio of the tool parameters, providing long-term MTBF without interruption in work, distinguish manufacturers who create a reliable and high-quality tool.
By the type of energy used, perforators are divided into:
Electrical appliances are the most popular and in demand. We will consider them further, specifying that they can receive power from:
Cordless rock drills are battery operated:
Main technical characteristics of rotary hammers
When choosing any model, you need to pay attention to four factors:
the power of a single mechanical shock along the axis of the nozzle;
The impact energy with a perforator is considered to be its main characteristic. It depends on many factors, including the mass of the striker, its stroke length, vibration frequency and other parameters.
The ultimate ability of any model to create enlarged holes in solid materials depends on the impact energy generated. When it is not enough, the productivity of the tool decreases sharply, and the mechanisms work for wear. For this reason, the manufacturer’s recommended loads must not be exceeded.
The impact energy developed by the hammer drill does not depend on the pressing force on it, like a drill. Therefore, you cannot put excessive pressure on it, otherwise you can break the tool.
The impact energy during work must be combined with the capabilities of the working attachments. Even carbide inserts can be damaged by overpowered tools.
The frequency of blows characterizes the number of vibrations of the striker per minute and affects the drilling speed.
By the location of the electric motor, perforators are divided into devices:
Models with a horizontal engine have less power and belong to the light class, and with a vertical engine they are able to withstand increased loads, but have larger dimensions and weight.
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Horizontal rotary hammers
These designs are designed to operate in one of three modes:
single blows without rotating the working body.
Some simplified devices can be supplied with only the first two functions. Recently, some of the professional models of manufacturers began to be produced without the implementation of the drill mode. They are not used for drilling, because most professionals have a drill or screwdriver in their arsenal.
Such lightweight rock drills have the following technical characteristics:
inflict from 500 to 1000 beats per minute with a force of up to 3 joules;
have an adjustable speed of rotation of the drill up to 1100 rpm.
comfortable front handle with adjustable setting for a secure hold of the tool with two hands;
stop for adjusting the depth of the hole;
a trigger switch with a button for fixing the operating mode of the engine and a speed controller;
a reverse switch for changing the direction of rotation of the rotor;
The speed of rotation of the working body can be adjusted by means of different pressing forces on the power button.
Vertical Rotary Hammers
They even look different from their previous counterparts, immediately standing out for their power, have all modes of operation and full-fledged controls, capable of delivering a working body from 1000 to 2000 beats per minute.
These models are often equipped with anti-vibration protection for the user’s hands and are designed with ergonomic handles for increased comfort in difficult conditions.
Advanced rock drills have built-in kinematic protection against damage to the mechanism and injury to the working person. It is performed by a clutch that limits the torque when the drill gets jammed.
The electronic immobilizer on these models and service indicators, such as the quality of the condition of the brushes, are a sign of the brand’s characteristics.
Certain types of rock drills are equipped with a two-speed gearbox.
Industrial designs may contain a vacuum dust removal system built into the housing and the kinematic diagram, or made as a separate removable unit. Inside it can be mounted an integrated drive or use the energy of the air flow from the cooling fan impeller.
Features of hammer cartridges
The working tool is inserted into a special holder due to axial pressing of the chuck head towards the body.
In this case, the cartridge works in two positions:
In the closed version, the spring system presses the fastening tabs inside the grooves of the accessory shank. To remove the working body, it is enough to press or turn the retaining ring located on the chuck body. In this case, the petals diverge, and the nozzle is freely removed from the nest.
The fastening of the working bodies is carried out with cartridges of various designs:
The abbreviation SDS stands for the special design of the insert-and-turn-drill chuck guide system, which was developed by Bosch.
The SDS shank has a 10mm diameter, two grooves, and goes 40mm into the chuck. It is fully compatible with SDS plus chuck and works great in it.
Construction SDS-plus is installed on all household and professional rotary hammer drills. They differ from the previous brand not by two, but by four diametrically located grooves. Guide wedges go into two open ones, and lock balls go into two closed ones.
Shanks of this brand are installed on drills with a diameter of 4 ÷ 26 mm and a length of 110 ÷ 10000 mm.
The SDS-top standard is designed for medium rock drills with a 14 mm shank and 70 chuck. It is an additional development for medium sized rock drills with larger holes from 16 mm in diameter, as it solves the problem of breakage of SDS-plus shanks. But, for them on the hammer drill it is necessary to change the cartridge. Because of this, they are not in great demand.
The SDS max chuck is used for high power rock drills. Working bodies with a diameter of 18 mm are fixed in them. Two closed and three open grooves work in a shank recessed by 90 mm into the chuck.
SDS-quick does not use shank slots, but lugs. This prototype is only used on special Bosch Uneo rotary hammers.
SDS-hex is specially formulated for reliable bit hold and peak retention in demolition hammers, although it works well with drills too.
Spline is analogous to the SDS-max shank. It is widely used on rock drills manufactured for North America.
Most hammer kits are factory supplied with a jaw chuck, which can be inserted as an add-on or completely replaces the SDS design. This allows the drilling mode to be used with conventional drills with round cylindrical shanks, designed to work in conventional drills. The same cartridges are commercially available.
An advanced dust cartridge is found on the elite models of rock drills.
Types of equipment for a hammer drill
drills of various lengths with all kinds of tips for creating punch holes;
peaks for knocking out horizontal deep grooves;
shovels for chipping tiles or other facing materials that are firmly attached to the foundations of building surfaces;
special nozzles for making round holes.
For correct and careful use of the tool, before inserting the working element into the chuck, it is necessary to lubricate this place with a special grease. This technique protects the premature wear of the rock drill and prolongs its technical life.
Every hammer drill requires careful handling. It should be stored in a prepared place, kept clean, replace worn carbon brushes in a timely manner, lubricate the undercarriage.
Periodic inspection and constant maintenance significantly extend the life of any mechanism.
Each of their models can perform a wide range of tasks, have different conveniences, but at the same time, it is best suited to work in some specific conditions.
Therefore, when choosing a punch, you should take into account its capabilities and compare it with the tasks for which it is purchased. Look out for features like:
the capabilities of the electronics to limit inrush currents and protect against overheating at the beginning of drilling and sudden changes in workloads;
blocking from impacts when processing wood or steel;
torque limitation in case of rotor jamming;
regulation of rotation speed, number and force of blows;
reverse, allowing you to release the working body when it gets jammed or use a hammer drill to turn out self-tapping screws.
We hope that you understand. we cannot give the answer to the question which model of rock drill is best suited for your conditions. Make your own choice based on our recommendations.
Which rotary hammer is better: barrel or straight?
Perforator. a tool for drilling holes in various materials, light slotting work. The device can be used for repair and construction tasks and dismantling.
The principle of the tool is simple. A high-energy impact is formed on the pneumatic principle, due to the reciprocating movements of the piston and the striker (striker) in the cylinder of the impact mechanism.
Thus, the hammer drill implements the possibility of using one of three functions: rotation (for drilling operations), impact (chiselling) or rotation with impact (drilling).
Considering the principle of operation and the tasks set, the location of the engine also changes. There are two types: horizontal (pistol) and vertical (barrel).
Therefore, it is important to understand how a barrel rock drill differs from a straight one and how to choose the right option. Let’s try to figure it out.
Why such names are barrel and straight?
The name comes from the look: the engine location makes its own adjustments to the design of the instrument.
Vertical (barrel). In this case, the motor is placed perpendicular to the drill axis in the central part of the body.
Horizontal (pistol). In this type of hammer drill, the engine is located along the axis of the drill, which makes the model similar in design to the pistol configuration.
Pros and cons of a horizontal (pistol) perforator
A straight (horizontal or pistol) perforator has the following advantages and disadvantages.
- Low weight. This makes it convenient to operate, it allows you to perform even ceiling work without any problems.
- Due to the design, it is suitable for use in narrow openings.
- Simple service, repair.
- The cost of such perforators is lower.
This tool model is ideal for installing drywall, wood-based panels, boards and guides, as well as facade work.
Therefore, answering the question of which perforator is better: vertical or horizontal, the range of work should be determined.
The horizontal model is ideal for household use, simple and short-term work.
Features of the vertical (barrel) rock drill
- power, more energy, and therefore higher productivity. You will be able to work with various tools, dismantle walls and foundations.
- intensive cooling system that will allow them to be used in extreme conditions.
- Parts and assemblies with higher wear resistance, due to which the rock drill will have a longer service life.
Thus, the barrel (vertical) rotary hammer is suitable for professional demanding tasks.
This tool can be used, in addition to working with wooden structures, drywall, for drilling and dismantling reinforced concrete, stone structures.
Therefore, if you are wondering which perforator to choose: barrel or straight, you should decide on the range of planned work.
For professional tasks, the recommendation is to give preference to the barrel rock drill. If the tool is purchased for occasional work, for example, simple home repairs, the option of a direct puncher is suitable.
One of the important points to look out for when buying a hammer drill is the manufacturer.
On the site you can choose both barrel and direct (pistol) type perforators. The Mächtz MRH-1250S DFR rotary hammer with a detachable DFR keyless chuck with a power of 1250 W and an impact energy of 3.8 J allows you to easily perform not only dismantling, but also drilling in various materials.
The Mächtz MRH-1920B drum hammer with a power of 1920 W, an impact energy of 7.8 J, with an improved anti-vibration system allows it to be used for longer without interruptions for “changing hands”, and thanks to the speed control, it is easier to work with various materials.