A machine... in a month

[kingcreaky]

how are the top members of the frame fastened on ? the ones where the linear rails fasten to, I can't see any weld on the inside joints.

they are welded, just not on the inside

If they are welded on then how do you level the linear rails on top of them ? because there would be no means of adjustment with shims etc.

In actual fact the top members were sat on top of the frame, which was in-turn sat on my relatively uneven garage floor. I then measured best I could with a spirit level before tacking them inplace.
I then made the gantry, double checked, before welding them solid. Maybe not the best method IMO, sometimes, you just need to get on with it, and not worry to much about the obvious. Otherwise you wont get anything done. Both times its been accurate enough, especially as there is some adjustment in the bed. The dti guage showed (once the bed was on) there was negligible twist. when tracking the gantry around dragging the dti on the bed.

"A little less conversation, a little more action"