| 摘要 |
Worked into the surface of a head (1), uniformly distributed over the circumference, are helical grooves (2) of dovetail-shaped cross-section. Wedging devices (6) and knives (5) resting thereon are insertable sideways into the grooves (2). Disposed in each wedging device (6) is a securing means (7), through actuation of which the associated wedging device with the adjoining knife (5) is pressed against the sidewalls (17, 18), tapering outwardly of the head (1), of the respective groove (2) and held fast. Each of the knives (5) has two opposite cutting edges (19, 20), each of which can be brought into operating position by reversing the knife (5). A second groove (16) runs parallel to each first groove (2). The grooves (16) serve to receive a guide component of a knife-aligning device. Owing to the helical configuration of the grooves (2) and the precisely aligned cutting edges (20) of the reusable knives (5) disposed in the grooves (2), vibration-free machining of workpieces with planing widths of up to more than two meters is possible. |
