On Wednesday 06 January 2021 11:36:36 Lester Caine wrote: > 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.
I would be very surprised if there weren't some of that too. But it would take better measuring tools than I have to fine tune leg heights. I did measure and try to get matching leg heights at the time but that was 2 years ago and memory fades. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
