Combination tool and tool holder for a combination tool

A tool holder for a combination tool, the tool holder extending along a rotational axis of the combination tool, the rotational axis defining an axial extension, the tool holder comprising:

• a tool mounting end section axially located at a distal end of the tool holder, the tool mounting end section configured to mount an inner cutting tool and an outer cutting tool and extend radially between the inner cutting tool and the outer cutting tool, the tool mounting end section comprising:
• a central tool mounting opening configured for mounting the inner cutting tool;
• a distal axial end section of the tool mounting end section;
• a section of the tool mounting end section located axially adjacent to the distal axial end section;
• a hydraulic chamber formed in the tool mounting end section, the hydraulic chamber configured to contain a hydraulic fluid, the hydraulic chamber comprising:
• a first hydraulic chamber section formed in the distal axial end section, the first hydraulic chamber section formed ring-shaped and encircling the rotational axis;
• a second outer hydraulic chamber section formed in the section, the second outer hydraulic chamber section formed ring-shaped and encircling the rotational axis;
• and
• a second inner hydraulic chamber section formed in the section, the second inner hydraulic chamber section formed ring-shaped and encircling the rotational axis;
• an outer clamp wall configured to elastically deflect radially outwards, the outer clamp wall comprising:
• a first outer peripheral clamp wall section defining the first hydraulic chamber section radially outwards;
• and
• a second outer peripheral clamp wall section defining the second outer hydraulic chamber section radially outwards;
• an inner clamp wall configured to elastically deflect radially inwards, the inner clamp wall comprising:
• a first inner peripheral clamp wall section defining the first hydraulic chamber section radially inwards;
• and
• a second inner peripheral clamp wall section defining the second inner hydraulic chamber section radially inwards;
• an annular wall extending radially between the second outer hydraulic chamber section and the second inner hydraulic chamber section;
• and
• a tool mounting peripheral surface surrounding the central tool mounting opening configured for mounting the outer cutting tool;
• wherein
• the hydraulic chamber is configured to variably set the hydraulic fluid under a hydraulic pressure;
• the outer clamp wall and the inner clamp wall define sections of the hydraulic chamber and are configured so that when hydraulic pressure in the hydraulic chamber is increased:
• the outer clamp wall elastically deflects outwards, which is configured to exert a clamping force on the outer cutting tool to clamp the outer cutting tool to the tool holder;
• and
• the inner clamp wall elastically deflects inwards, which is configured to exert a clamping force on the inner cutting tool to clamp the inner cutting tool to the tool holder;
• the first hydraulic chamber section is configured to exert:
• a clamping force by the first outer peripheral clamp wall section and a clamping force by the first inner peripheral clamp wall section,
• both of which, due to hydraulic fluid in the first hydraulic chamber section, are transferred radially between the first outer peripheral clamp wall section and the first inner peripheral clamp wall section;
• and
• the annular wall is configured to counteract the clamping force exerted by the second outer peripheral clamp wall section on the outer cutting tool and the clamping force exerted by the second inner peripheral clamp wall section on the inner cutting tool.