| 摘要 |
<p>A method of undercutting commutator bars wherein to effect removal of insulating material along the sides of the insulating segments (5) the laser beam is directed parallel to a radius (R) but offset therefrom by a distance (X). By this means the laser beam is caused to impinge on the side wall of the insulator during the undercutting process. To effect undercutting of the other side of the insulator the commutator body (1) is moved not only forward and back along the rotational axis (2) but it is also moved transversely at the end of each stroke whereby the laser beam is caused to impinge on the commutator offset by a distance (Y) to the other side of the radius (R), the offset (Y) being equal to that of the offset (X). <IMAGE></p> |
