Clamping system for a press brake comprising two internally interconnected cavities, press brake comprising such a clamping system, and method of manufacturing an elongate beam for such a clamping system

A method of manufacturing an elongate beam for a clamping system for a press brake, the elongate beam comprising a receiving space for receiving a part of a bending tool, the method comprising the steps of:

• a) providing an elongate beam;
• b) forming at least two cavities in said elongate beam, each of the two cavities having an opening to the exterior of the elongate beam;
• and
• c) providing a fluid connection to each of the at least two cavities;
• the method further comprising arranging a piston either directly in each of the at least two cavities, or in a cylinder in each of the at least two cavities,
• wherein said providing the fluid connection is performed by interconnecting the at least two cavities by inserting a tool into at least one of the at least two cavities through its opening, and machining towards another one of the at least two cavities.