Hi. I have a home made cnc machine built out of heavy duty 80x160 aluminium extrusions. I had them milled flat by a local shop, but for some reason they werent as flat as I wanted them to be. I resorted to shimming and in the worst location I had to put 0.3mm shims. This works fine, but the shims are not perfect, as they create "hills" due to the bow/warp of course. Also I suspect there may be some twisting going on, but it is difficult to tell because the HGR 20 linear rail carriages are flimsy as hell in my opinion (easy to force 0.1-0.2mm indicator movement by pushing the right/left edge. Anyway, I now have access to a 1500x50mm assembly straight edge DIN874/00. I was thinking if I could somehow try to lap the linear rail surfaces by moving that back and forth over thr surface, using some abbrasive or something.. Any ideas folks, did you ever try something similar?
Oh and I migth switch to 25mm linear rails, the 20s are just mehh. My machine is 1500x1200mm in Y/X so I could use the added stiffness.
Thanks!
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