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Radial giving of a cutter is carried out by additional mechanisms or manually. Wider circulation was gained by mandrels of the first look, because of their bigger universality, possibility of application on any machine and simpler readjustment.

At modular or mnogoshpindelny processing spiral drills which are characterized by big profitability as a result of the possibility of a large number of repoints raised by accuracy found broad application.

Accuracy can be increased, reducing a gap between the plug and a drill, increasing height of the plug and reducing giving size. But the increase in height of the konduktorny plug not always structurally perhaps, but gives smaller effect, than reduction of a gap. Giving needs to be chosen at the rate on a longitudinal bend of a drill.

Broad application was found by the combined tool. Combination of draft and fair processing, processing shaped, step or several coaxially located openings, combination of various operations, is carried out by such tool for one pass

The forward direction on the processed opening is applied at coaxial processing by the long, nonrigid tool of the opening which is earlier processed on the other hand in cases when other view of the direction is unacceptable.

For elimination of breakages of drills and increase of their firmness it is important to choose length of working part of a drill. The long drill during the work caves in,  decreases rigidity on twisting, the number of breakages increases.

Electroerosive processing is based on destruction of metal under the influence of the electric discharge passing through the dielectric environment. As a working environment the liquid filling interelectrode space is used. After accumulation of a necessary charge between the anode and the cathode there is an electric breakdown of liquid therefore there is a plasma channel of the category where processes of heating of disintegration and ionization of substance of a working environment proceed.

When boring small openings on modular machines cutters with integral hard-alloy heads are widespread. Such cutter has the increased rigidity owing to higher module of elasticity of a firm alloy in comparison with steel. As a result of sharp reduction of flexural and tortional deformations, the increased ability of firm alloys to extinguish vibrations, their high cutting properties and wear resistance service life of cutters increases, thus high precision and quality of the processed surfaces is provided.

Dimensional wear of boring cutters as a result of which there is a reduction of the size of the processed opening has essential impact on the accuracy of processing of openings. The design of a boring mandrel in this case has to provide possibility of half-adjustment of a cutter within 1-2 microns.

The direction on back and forward directing the tool in konduktorny plugs is applied at serial processing by several tools of deep or several coaxial openings at long distances between them, and high requirements to their coaxiality.

When processing on modular and boring machines it is necessary to sustain with an admissible accuracy the diametrical sizes of the processed openings, and when undercutting end faces – and the linear sizes defining the provision of the processed end face.

When processing openings are widely applied boring by cutters. Wide use of boring is explained by high precision of processing of openings by the sizes and a geometrical form, exact ensuring situation concerning bases.

Exact openings on these machines process for two and more transitions. Therefore the accuracy of fixing of mnogoshpindelny delitelny tables has impact on unevenness of an allowance at final operation. From the normalized knots the greatest accuracy of fixing provide delitelny tables of the CK 160-8M model.

When designing the tool sent to one of the listed ways it is necessary to coordinate correctly lengths of its separate sites with the corresponding sizes of the conductor, watching that the tool during the whole time of interaction with a detail had the sufficient direction according to the chosen scheme.