| 摘要 |
FIELD: technological processes. ^ SUBSTANCE: instrument contains a working part with symmetric, against an instrument, axis shaped cross-section having the sides with small curvature, including conic, having peaked aligning element, both prismatic sections and a shaft. The working part is supplied with additional conic and prismatic sections, shaped cross-sections corresponding to sections of the conic and prismatic sections, sequentially located between a prismatic section and a shaft. Thus four cutting cogs are rigidly fixed on an additional prismatic section on the sides with small curvature, uniformly located against each other. ^ EFFECT: productivity increase. ^ 8 dwg
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