Quote Originally Posted by Mcgyver View Post
My point was some posters seemed to be thinking the EG was going to have a big effect on stiffness and I can't see that. Whatever the size, each cross section is going to deflect, and if the engineering goal is to minimize that deflection (make it stiff) EG is poor choice of material.
1. The objective here is to build a solid, 1- 12ft CNC frame (or table, or gantry). Leveled, precision surface for linear rails (up to 12ft long).

2. You can use ANY material, but...

3. You can't use a metal saw, milling machine, welding machine or drill press.

What would you do..?