On 06/01/2021 15:47, Gene Heskett wrote:
That probably would not leave enough meat for the clamp bolt heads to pull against in places. These are off a 16th" or more from previous checks. Very poor extrusions IMNSHO.
I have a router table with an A3 working area, using an extruded bed. The table itself is fairly flat, but twists if not clamped down to the bench. I simply shimmed the rails to ensure that the bed is flat using a sprit level, and I'm not seeing any bowing in the bed itself. The gantry rails also needed a little tweaking to ensure the other motions are parallel to the bed. Result, the cutter is within a few thou of level over the whole bed. I could skim the surface and there is 0.05" step on the slots, but jobs I am working on don't need that finer accuracy, and small jobs are certainly a lot flatter.
Had I found the bed was distorted then obviously a new extrusion may be an option, but there is plenty of room to fit a couple of bars to the back of the bed to pull things square. The ends of the bed are already bolted directly to a large cross rail and it's these that get shimmed to level things and remove the twist.
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