Coupling assembly for a machining device

A coupling assembly to be used in a machine tool for mounting a work piece to be machined in a torsionally fixed manner, comprising:

• a pallet adapted to hold said work piece to be machined, said pallet having guide channels;
• a pallet support, said pallet being positioned on said pallet support, said pallet support comprising:
• an alignment surface for aligning said pallet with regard to said pallet support, said alignment surface having a plurality of alignment cams, said plurality of cams having base portions and incisions disposed below said base portions, said incisions providing for a resilient yielding of the related alignment cams, said cams being disposed such that two opposite cams cooperate with said guide channels;
• and
• a plurality of rest heads located substantially in the comers of said alignment surface;
• a swiveling pallet, said pallet support being operationally coupled to said swiveling pallet, said swiveling pallet comprising a support wall perpendicularly mount to said pallet support means and a guide, said guide comprising a sliding surface having a dove-tailed shape and having incisions that provide for a resilient behavior of said guide.