| 摘要 |
Damaged threads in a blind tapped hole are repaired with a tap having an elongated shaft with a plurality of outer faces, and a plurality of flutes corresponding to the number of shaft outer faces, each flute has an outer face with a lower segment with cutting threads corresponding to the hole threads, and is moveable radially between a closed position toward the longitudinal axis and a radially expanded position in which the threads of the flute outer face mesh with the threads of the hole. The tap is inserted into the hole while the flutes are in the closed position so that the cutting threads are below the damaged threads. The shaft is then inserted between the flutes to move the flutes to their expanded positions meshing the cutting threads with undamaged threads below the damaged threads. The tap is then rotated to repair the damaged threads. |
