Spotting drills belong to a number of professional tools, as they are used in most cases in the industrial field. The main difference between these devices and conventional ones is their accuracy of the drilled hole. Find out how center drills work and where they are used right now.
Design Features
Outwardly, this tool is a small drill of short dimensions with a very thick base. Moreover, its diameter can be 2-3 times the width of the working tip of the mechanism. Thanks to this design, the center drill (GOST confirms this) has a very high rigidity, therefore, when drilling a hole, it is almost impossible to bend it or deform it in any other way.
How does this tool work?
First, the small tip drills a small diameter hole. It, as a rule, is formed after several rotations of the instrument (no more than 2-3 seconds). After that the samethe small hole is widened by the cutting edge of the thick conical part of the drill. It should be noted that the operation of this mechanism ensures the exact perpendicularity of the recess relative to the material being processed and its surface.
Application
The center drill is used for drilling both metal and wood surfaces. However, "according to the passport", that is, for its intended purpose, this tool should only be used for processing steel materials. However, this did not prevent our builders from using it as a countersink for wood, for example, when it is necessary to deepen the hole for the incoming screw head. Due to their heat-resistant and high-strength construction, they will not fail at all after processing such objects and materials.
As for their direct purpose, these tools are widely used for drilling holes on milling, drilling and turning machines. In addition, center drills can also be used in the household. Radio amateurs also like to use such devices. Such drills are more than ever necessary for making holes in printed circuit boards. And since the devices used have high rigidity (this is due not only to their composition, but also to the special geometry that we talked about a little earlier), working with them is very easy and convenient.
Material
The composition of these devices most often includes tool steel of the R6M5 series. In addition, center drills canMade from HSS high speed metal. But tools made of steel of the P9 series, which has a high content of tungsten, are especially valued in the production. Due to this, the product becomes even more durable and reliable.
Price
The cost of centering drills directly depends on their dimensions. So, for example, the smallest 1-millimeter devices cost about 15 rubles per unit. The largest drills with a diameter of 6.3 mm cost about a hundred rubles.
