thereby lightening it as much as possible without compromising its rigidity furthermore in designing a particular vibration fixture 10 the use of finite element structural analysis is extremely beneficial in ensuring that the vibration fixture 10 is rigid and in also assuring high resonant frequency for the vibration fixture 10 and maximizing vibration amplitude at any resonant frequencies one detail of each vibration fixture 10 obtained by using finite element structural analysis is a specification for the precise location cross sectional shape and thickness for the wedge shaped ribs 32 which in general vary among different vibration fixtures constructed in accordance with the present invention the use of ribs 32 having a wedge shape determined by finite element structural analysis increases the resonant frequency of the vibration fixture 10 while concurrently making the fixture more rigid and reducing the amplitude of fixture flexing fig2 is a diagram which represents three mutually orthogonal axes x y and z of the device 42 respectively by arrows 52 54 and 56 a vibration vector 58 identified by the letter 34 v 34 which is parallel to the vibration axis 26 projects from an origin 62 of the mutually orthogonal axes 52 54 and 56.