I was having issues with a wavy bed. I got around it by using a sacrificial waste board that I would flatten before each project. I changed my garage layout and had to disassemble the old table and since I had it apart I took the time to design a torsion table integrating the Longmill into the design and overall rigidity.
I decided to use 4 each 48 inch/1200mm aluminum construction levels sandwiched between plywood and MDF.
I predrilled and countersunk every hole through the levels on each side so that I would get a solid and flat connection between the levels and the wood sheathing.
I made sure to use screws that had an unthreaded portion to get strong forces pulling the pieces together instead of pulling on the wood itself.
Then I constructed the waste board out of replaceable MDF slats and aluminum T-slots running perpendicular to the levels within the table.
I then adjusted the feet on the Longmill so that they lined up with the levels within the table, but waited to drill those holes until I squared the CNC.
Then I loosely screwed down one leg of the CNC with just one screw on each end and went through the calibration procedure in G-sender to square the legs. Once squared, I drilled the holes and mounted them.
The end result is dead flat. The levels had internal holes that allowed me to route the wiring internally. I will do the finish work next, but wanted ti share the open table pictures before I go any further.
