Machining of the deep light apertures is relevant to difficulties engendered by the low stability of the tools and the necessity of led way to the receipt chips often with unsuitable dimensions and shapes. With the increase of the aperture lengths (the correlation L/D of their dimensions), the problems of their skiving are aggravated and most frequently solved by using skiving tools guided along the processed surface. However, such a location of the skiving parts of the tools is aimed at that the radial forces of cutting are balanced within the system of the tool and the round billet so that their resultant is minimum or equal to zero. One of the most popular and reliable solutions is using immovable or movable two-cutter blocks supplied with cutting parts with the same geometry and located at 180°.
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