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These devices with imaginary prism eliminate friction between the part generators and prism flanks, to rotate for control the work piece. This is especially beneficial to control large parts and / or high mass. Moreover, the new concept, we have proposed eliminating sources of error caused by the elements that shall enter into relations of calculation of errors characteristic of this means of control. This becomes possible by using an adjustable system to which it is associated the safe assembly principle, AS (principle patented) and by final processing method of the active surfaces of the device, in assembled. By this method it fully satisfy requirements imposed by a robust design, in that the device analyzed retains its initial parameters precision, even after some adjustments, fitting and removing repeated, giving thus evidence of an exceptional reliability, translated by robustness and insensitivity to the external "noise factors".