How to Reverse a Hammer
The hammer drill was invented in 1851 as a tool for the mining industry. In 1932, Bosch presented in Germany the first electromechanical hammer drill designed for construction work. Since then, Bosch Hammers have been mass-produced; other firms have acquired production licenses. The main functions of the punch: drilling, drilling and impact. How to use a punch, performing various types of work?
The principle of operation of the punch
The innovative essence of the invention of the hammer drill is that the impact force is generated by the tool itself. This happens due to the conversion of the rotational energy of the electric motor into the translational motion of the piston. The piston drives the striker (drummer), which is already directly doing the work.
Depending on which tool is used, which mode is activated, the punch can drill, drill or work in the jackhammer mode.
The rated power of the punch ranges from 1.5 kJ to 20 kJ. If you imagine that a weight of 1 kg was dropped from a height of 1 m onto the floor, then it will hit the surface of the floor with a force of 1 kJ. Accordingly, a 20-kilogram weight will strike with a force of 20 kJ.
Instructions for use
Hammers are widely used in modern construction industry, they replaced the monotonous and ineffective manual labor. But its use is fraught with certain risks that you need to know about before you get started.
First of all, you need to work with a working tool in the normal mode authorized by the manufacturer. Power supply must be provided through a cable, the cross section of which corresponds to the power consumption.
After transporting the rotary hammer in the cold season, it is necessary to wait at least half an hour to soften the lubricating fluids inside the mechanism.
The operator performing the work must be healthy. Before work, it is necessary to study the instructions for the device and safety rules.
The main operating modes of the punch
Hammers operate in several basic modes, switched by the operator depending on the work being carried out.
It is carried out after switching the regulator to the corresponding mode (drill icon). The vast majority of models of rotary hammers are equipped with a function of gradual set of revolutions of the working shaft. The speed is controlled using the start button. With a slight pressure, the rpm from zero gradually rises above. When the button is pressed all the way, the speed becomes maximum.
Depending on what material needs to be drilled, it is recommended to adjust the speed of the drill or drill. So, wooden products are best drilled at high speeds, metal at low, and concrete or stone. at medium.
Most often, a hammer drill is used for drilling stone or concrete. This is due to the fact that the cartridge device for attaching the drill has a backlash in the longitudinal axis, designed for shock-drill function. Therefore, when drilling holes in wood or metal, it is not always possible to achieve the desired accuracy. The tip of the drill may slightly “wag”.
For precision hole drilling, a cam chuck with an SDS shank is recommended. The drill without play is fixed in a cam chuck, which is inserted into the hammer drill. Cam chuck is included or sold separately. Using a replaceable chuck, you can drill any holes and materials.
In the drilling mode, you can use a punch as a mixer for mixing various building mixtures. from paint to light plaster and gypsum compositions. Great convenience lies in the fact that the speed and direction of rotation are conveniently adjustable.
Drilling mode is activated by moving the switch register to the middle position (you need to select the icon of the drill and hammer). Usually indicated by the sign of the drill and hammer drawn on the body at the same time. Drilling is used for mortising concrete and stone materials. You can not only make holes, but also lay channels for wiring electric and other cables in plaster or brick walls.
Since drilling has many different forms, engineers have developed numerous nozzles for work in various conditions. All of them are united by the presence of a special shank, which is combined with the SDS cartridge.
Shock mode is used for installation and dismantling. On the mode switch is indicated by a hammer icon. When working in this mode, there is no rotation of the working shaft. Only the translational movement of the tool occurs.
The reverse function allows you to switch the direction of rotation of the cartridge in different directions.
Often when drilling reinforced concrete structures, the drill rests against the reinforcement and enters the clinch with it. In order to release it, a reverse switch is provided, which makes it possible to turn the drill in the opposite direction and continue drilling, bypassing the fittings. Usually the reverse button is located directly next to the start button of the unit.
Video: How to Reverse a Hammer
The reverse mode turns the puncher into a screwdriver, with which you can screw and unscrew the bolts, nuts and screws of any size and configuration.
Additional tool features
In addition to the above, a standard set of options in a modern punch include:
- ruler to determine the depth of the hole;
- lever for fixing the working position of the start button;
- safety coupling. stops the motor when the drill is jammed.
And also in the design of each device are systems:
- dust extraction. an impeller on an engine with a system of dust-removing ducts;
- vibration damping. special springs between the housing and the power unit;
- electronic regulation of the work and condition monitoring of the brushes on the collector of the electric motor.
An important rule, non-observance of which can lead to the failure of the hammer. Switching modes should only be performed when the tool stops completely.
Video: punch mode switching
Instrument Safe Use Guidelines
Use a hammer drill only with personal protective equipment. These include safety glasses, earphones, gloves, and a respirator. Clothing should be without fluttering long-sex elements. Hair is collected under the headpiece. Shoes should be dry, comfortable and non-slip, preferably with socks reinforced with metal plates.
Attention. It is forbidden to work with a puncher in poses with an unstable fulcrum. Kickback while drilling can put a person out of balance, resulting in injury.
The noise level of a working tool fluctuates around 100-110 dB. If the surface being treated resonates (for example, a concrete wall), then the noise can reach 140–150 dB. Such a sound load can lead to somatic diseases or mental disorders. Headphones or ear plugs must be used.
How to insert / pull out a drill or drill
To work with a hammer drill was safe, you need to master a few simple skills. Mandatory skills include installing and removing a drill, drill or any other attachment.
Work Tool Installation
All drills have an SDS cartridge that does not require keys. Unlike cam chucks, installing a drill takes seconds:
- Pull the base of the cartridge down.
- Insert the shank of the drill into the hole.
- Release the base of the cartridge, the spring will return the cartridge to its place, the mechanism of locking balls will reliably clamp the drill in its metal arms.
- Check that the drill is mounted securely by pulling it towards you. The cutting tool must not be pulled out.
A properly installed drill should not come out of the socket more than 1 cm when trying to pull it out by hand.
If a cam chuck is installed in the perforator, the drill can be fixed in the traditional way. by rotating the chuck body around its own axis until the thread is tightened.
To remove the drill or nozzle after work or for replacement:
- Wait until the cartridge stops turning completely.
- Pull the base of the cartridge down until it stops.
- Remove drill from chuck.
- Release the base of the cartridge.
Attention! From friction, the drill gets very hot. Use gloves to prevent burns.
To get a more complete picture of the wide possibilities of a rotary hammer, we will take a brief excursion into the world of nozzles that are used in the operation of this power tool. The main types of nozzles:
- Boers. "Drills" designed for drilling on stone and concrete. At the end are reinforced with carbide head. The main purpose. installation work, fixtures, wiring communications.
- Crowns (tsifenbori). Device for cutting holes of large diameter. If you need to make a hole of great depth, special adapters are used with crowns, which allow you to extend the equipment to the desired length. Successfully used for processing ceramic tiles, in the installation of electrical equipment.
- Chisel. The most diverse category of drill bits. They differ in size, shape, length and width of the working surface. There are chisels in the form of peaks, in the form of a flat blade, as well as channel chisels (strobers), designed to hollow out channels in concrete or brick walls. An indispensable assistant in the dismantling work (removing old tiles, dismantling the screed, adjusting and leveling the brickwork before plastering).
Photo gallery: drills, crowns and chisels
All types of nozzles are installed in the SDS cartridge the same way, the principle of movable clamping balls is used in fixing. With proper installation, the tool can move freely along the longitudinal axis without falling out of the socket.
If the red LED on the control panel of the rotary hammer lights up, this means that the unit is operating with excess of the standard load on the engine. A technical inspection should be carried out and the cause of the overload removed.
Where else can we use a hammer drill
The scope of the punch is not limited to working with concrete or stone. Wherever percussion technique is required, this versatile apparatus can be used.
Drive a pipe into the ground
Heavy punchers. weighing over 8 kg and impact up to 20 kJ, are used when driving an Abyssinian well. A galvanized pipe with a sharp tip is placed vertically and, using the hammer mode, is driven into the ground. Of course, the diameter of such a pipe cannot be large (up to 1 inch). But this is enough to provide water for the average family. This method is used when the device is withdrawn in places inaccessible to heavy drilling equipment.
We ram the ground in the greenhouse
The use of a nozzle on a perforator for tamping the soil proved to be quite good. It is a flat metal plate, which “trample” the ground. It is used on a local scale in the construction of greenhouses, the arrangement of beds.
Mix cement mixes
The main part of the punch is a rotating cartridge. This is enough to instruct the puncher to knead the cement screed or tile adhesive. All that is needed is to purchase a mixer nozzle with an SDS shank.
Summing up, I would like to note that this article is for guidance only. Complete information is provided in the instruction manual that each manufacturer attaches to their products.
The tools produced by various companies vary in performance and characteristics, there are features of operation. This must be taken into account when using the equipment during operation.