FIELD: mechanical engineering; manufacture of multiple-start worm abrasive tools. SUBSTANCE: helical surface of main worm of multiple-start worm abrasive tool for machining toothed articles whose profile is engageable with profile of flat tool rack is made in form of helical rack. Starting line of helical rack is joined with starting cylinder of main worm over entire its length due to rolling of starting straight initial flat rack without sliding over helical line of starting cylinder. Generatrix of rack is combined with radial axis. EFFECT: approximation of convolute worm to involute worm at simplified fitting of working tools. 1 dwg
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