Center drills belong to a number of professional tools, since they are used in most cases in the industrial field. The main difference between these devices from ordinary ones is their accuracy of the drilled hole. You will find out how centering drills are arranged and where they are used right now.
Design Features
Externally, this tool is a small drill of short dimensions with a very thick base. Moreover, its diameter may be 2-3 times the width of the working tip of the mechanism. Thanks to this design, the centering drill (GOST confirmation of this) has very high rigidity, therefore, when drilling a hole, it is almost impossible to bend or deform in any other way.
How does this tool work?
First, a small tip drills a hole of small diameter. It, as a rule, is formed after several rotations of the tool (no more than 2-3 seconds). After that, the smallest hole expands with the cutting edge of the thick conical part of the drill. It is worth noting that during the operation of this mechanism, the exact perpendicularity of the recess relative to the material being processed and its surface is ensured.
Application
A centering drill is used for drilling both metal and wooden surfaces. However, "according to the passport", that is, for its intended purpose, this tool should be used only for processing steel materials. However, this did not prevent our builders from using it as a countersink on wood, for example, when it is necessary to deepen the hole for the incoming screw head. Thanks to their heat-resistant and high-strength design, they absolutely do not fail after processing such objects and materials.
As for their direct use, these tools are widely used for drilling holes on milling, drilling and turning machines. In addition, centering drills can also be used in the household. They also like to use such devices and hams. 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 P6M5 series. In addition, center drills can be made of HSS high speed metal. But tools from steel of the P9 series in which there is a high content of tungsten are especially appreciated in production. Due to this, the product becomes even more durable and reliable.
Price
The cost of centering drills directly depends on their dimension. So, for example, the smallest 1-millimeter devices cost about 15 rubles per unit. The largest drills with a diameter of 6.3 millimeters cost about a hundred rubles.