the clamping system 1 features a fail safe functionality in the conducting state the electro magnetically operable control valve 6 is in the position shown in fig1 and 2 in this position the pressure chamber 3 is pressurized with fluid and the pressure piece 5 is pushed radially inwardly against the force of the energy storage 2 such that it cannot be operatively connected to the drive sprocket 8 and clamp it in case of an unexpected energy breakdown the electro magnetically operable control valve 6 is no longer supplied with current and then assumes the position shown in fig3 u2014 e g due to a spring load u2014 in which the pressure chamber 3 is no longer pressurized with fluid since the pressure chamber 3 is now depressurised the energy storage 2 pushes the pressure piece 5 radially inwardly such that it acts on the drive sprocket 8 and clamps it fig4 shows a further embodiment in which the clamping system 1 does not act on the drive sprocket 8 from the inside as is shown in fig1 to 3 but from the outside apart from that the structure and the function are identical to those explained in connection with fig1 to 3 fig5 shows a comparison between a machining center according to the state of the art left side and.