How to choose a punch

How to choose a punch

Among the modern building electric drills for many years occupied a leading position, as has long attracted the attention of buyers for its unique features . Today, classic puncher usually attributed to the professional level tool that is used commonly for the special assembly and installation work .

Indeed, in comparison with a conventional power drill that has incomparably more features and can be used to perform the following operations:

punching any durable medium (brick , concrete, stone , etc.) by the impact of destruction of the latter;
plunge into high-strength materials ( with their simultaneous punching ) ;
breaching in coatings of special working grooves ( Grooves ) used for flush- mounting ;
removal of the upper layers of the old lining coating by its destruction and forced peeling .

Types of drills and their ability to

Consideration of how to select the drill should begin with an introduction to the existing models of the instrument.

All known models of perforating the breakdown mechanisms of action are divided arbitrarily into the following classes:

Impact drills (” shock ” drill) ;
Hammers professional level;
hammers home the class.

First of all , you should learn the difference between a full punch from the so -called impact drill . Drill chuck in vibrations generated by mechanical clutch mechanism built in the gear wheels (” ratchets “) and applied to the body of the tool operator physical effort . The force of impact action is low , resulting in penetrating the effectiveness of such a tool leaves a lot to be desired.

In contrast to the modern professional punch drills  is equipped with special electro-pneumatic hammer mechanism or electromagnetic action. Only a few (not very common ) models drills nodes are used , something similar on the device with the impact drill, conceding to them , however, the reliability of the working mechanism .

The use of a special pneumatic rotary hammers node enables several times faster than spending the same operations with the expenditure of only a third of the effort expended typically when working with mechanical hammer action ( impact drill ) .

Hammers professional level are different from the patterns of household only index MTBF , and a maximum time of continuous operation of the mechanism. Yet their other parameters relating to the design and layout of the devices and their circuitry virtually identical.

According to the number of simultaneous functions, all drills are divided into single-mode devices ( drilling) , dual-mode ( hammer drilling ), and tri-mode ( hammer drilling plus slotting ) .

Below is a brief list of operations that can be performed with different types of drills :

drilling in metal, concrete and wood ;
Screwing in the screws and eversion ;
Grooves gouging ;
chipping tides and ceramic tiles ;
Preparation of openings in concrete walls and floors ;
clogging of the metal workpieces ;
compaction , etc.

Additional operational features

When selecting a suitable punch sure to pay attention to the presence in the model you like the following important features :

electronic control of the start of drilling and power stroke ;
electronic protection , allowing an increase in workloads shift to a soft start ( to limit inrush current limiting and thermal protection ) ;
emergency (safety ) decoupling of the drive coupling release by bit jam ;
the ability to set the desired mode of operation ( speed , frequency and power stroke ) ;
Having the ability to manually change the direction of rotation ( so-called reverse ), allowing , if necessary, to free jammed drill , and use a hammer as a screwdriver .

And finally – a few words about the structure of the drill to be used for punching and drilling .

Because concrete is the easiest way to makes its way through the impact on it – the working part of the drill hole punch should be similar in form to the edge of the chisel. If you rotate a chisel and at the same time to strike at its shank , the result can not get the required us a round hole.

Placed on the base along the guide grooves are helical drill for evacuating drilling and thereby increase the performance of the mechanism as a whole.