Here is a plan for a torsion box for a Shapeoko XXL. You could modify the dimensions for any machine you want. In the plan I give you several alternatives for making jigs to make the torsion box. Additional to the torsion box I have an XXL and it sags in the middle if you do not put a block or something. So I removed my leveling feet and put a piece of 3/4" rigid foam board down underneath the machine so the entire base rests on the foam. This foam gives support to the frame and helps dampen vibration and noise. Now there is not much noise reduction but every little bit helps.
torsion_box.pdf (2.0 MB)
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