I analyzed the structure in ANSYS. Results are better and more hopeful but the question remains: What is the preferred (acceptable) range for frequencies and relevant deformation in CNC machines like the one that i am going to build? Any suggestions? Thanks.
Click image for larger version.  Name: M1-T.jpg  Views: 233  Size: 73.8 KB  ID: 12382Click image for larger version.  Name: M1-X.jpg  Views: 228  Size: 82.6 KB  ID: 12383Click image for larger version.  Name: M1-Y.jpg  Views: 239  Size: 77.9 KB  ID: 12384Click image for larger version.  Name: M1-Z.jpg  Views: 232  Size: 78.3 KB  ID: 12385Click image for larger version.  Name: M2-X.jpg  Views: 224  Size: 82.5 KB  ID: 12386Click image for larger version.  Name: M2-Y.jpg  Views: 228  Size: 80.8 KB  ID: 12387Click image for larger version.  Name: M2-Z.jpg  Views: 251  Size: 75.4 KB  ID: 12388