surfaces 30 c and 32 c at an angle with respect to the longitudinal axes of cross members 30 and 32 in a range of 35 u00b0 to 45 u00b0 and most preferably at an angle of approximately 45 u00b0 and at an angle with respect to the z axis in a range of 35 u00b0 to 45 u00b0 and most preferably at approximately 45 u00b0 consequently vibration assemblies 50 a 50 b 50 c and 50 d may produce x y and z vector forces in the same planes as vibration assemblies 48 a 48 b 48 c and 48 d in the present invention the vibrators are mounted on the vertical mounting surfaces of the respective reinforcing members this configuration has multiple advantages over the previous methods referring to fig1 20 vibration assemblies 18 generate the same three force vectors described previously i e a b and c however these force vectors are generated in the reinforcing members which are attached to the lower horizontal surface of the vibration platform the reinforcing members act like large load spreaders distributing the energy across the platform so that the high energy u201c spots u201d are diluted in amplitude and cover a much larger area since the vibration assemblies attachment point is preferably several inches below the platform which will tend to create a small pivoting action the force vectors are made less defined and include some rotational energy as best seen in fig2 an.