A dedicated V-shaped groove forming machine comprises an X-axis slider dislosed over a plate material so as be movable in an X-axis (groove forming direction); a Z-axis slider supported by the X-axis slider so as to be movable in a Z-axis direction (vertical direction) ; and plural cutting tools mounted...http://www.google.se/patents/US5575598?utm_source=gb-gplus-sharePatent US5575598 - V-shaped groove forming machine and its control method
