According to the manufacturers, the time reduction is possible because the taps feature a special frontal cutting-edge geometry that allows tapping directly, skipping the calibration phase and at the same time eliminating the risk of tool breakage. As is explained, this breakage is usually very frequent because of the reduced or irregular dimensions of the cored holes. Further performance-enhancing design features include the through coolant, the combination of an ultrafine grain carbide substrate with a film of special coating to minimize both tool wear and chipping, and a reinforced shank to improve tap rigidity.
Direct tapping with no tool breakage
Yamawa will be introducing the new family of ACHSP taps that reportedly enables a significant reduction of production time in the manufacturing of aluminum workpieces requiring the threading of cored holes.