Clamping device

A clamping device for clamping a work piece, comprising:

• a chuck;
• a collet positioned inside the chuck;
• and
• a bayonet fastener operatively arranged so that the collet is fastenable in the chuck and is removable from the chuck solely by manual operation of the bayonet fastener without the use of auxiliary tools, wherein the bayonet fastener includes a manually operated activation ring and a bayonet ring operatively connected to the activation ring for securing the collet to the chuck, wherein the activation ring is rotatable and is operatively arranged so that rotation of the activation ring moves the bayonet ring between a closed position in which the bayonet ring secures the collet on the chuck and an opened position in which the bayonet ring releases the collet on the chuck, and wherein the bayonet ring has spaced apart radial grooves and the clamping device further includes pins projecting in a radially inward direction from inside the activation ring to engage in the radial grooves of the bayonet ring to transmit a rotational movement of the activation ring to the bayonet ring.