TOOL

摘要

A cylindrical support for a cutting tool is provided with a plurality of grooves. A series of alternate sized cylindrical rollers are mounted in each groove and the cylindrical rollers are all in abutting relationship to each other. In addition, a helical cutting blade is mounted in each groove with one surface of the cutting blade bearing against a support wall of the groove and the other surface of the cutting blade facing and abutting the larger cylindrical rollers in each groove. The smaller cylindrical rollers in the grooves bear against the wall of the groove opposite to the wall that the cutting blade bears against. Each groove is provided with a threaded bore extending parallel to a longitudinal dimension of the groove. A set screw is threadedly mounted in each bore. The inner end of the set screw bears against the end cylindrical roller in each of the series of rollers. By screwing the set screw inwardly against the end roller the cylindrical rollers move relative to each other and transverse to the direction of the force exerted by the screw so that they move against the helical blade at spaced distances along the length of the blade forcing the helical blade against the supporting wall of the groove and locking the blade in the groove.