Quote Originally Posted by Jonathan View Post
How can you be sure that after the frame has been machined when you fix it to the floor it does not distort.
I too did think about this and came to the conclusion that as the machine is to be made from pretty substantial material it will not be able to distort. Do the large professional cnc machines get aligned up on site when they are delivered ?

Quote Originally Posted by Jonathan View Post
Another way to get them parallel in the vertical plane is to mount them on (the right type of) epoxy. Pour the epoxy on the rail mounting surfaces with a channel (or several channels) in between and gravity will level it 'automatically' with very high accuracy.
I have read about this, but never did find out where the "right type of epoxy" can be sourced.

I don't want the machine bolted to the floor, I just want it to sit on the levelled feet.

Do you think that once a frame is constructed from 80mm * 80mm * 6mm box section and then machined it will still be able to distort ?