Setting up the gantry rails. The top rail has been fitted alongside a straight edge parallel to the front face of the gantry, this is the bottom rail being positioned. I put a bearing block on the top rail and fastened a G-cramp to it, then I attached a DTI with a magnetic base to the G-cramp. Sliding the block along showed that the rails were within 0.002" of parallel. Now to drill, tap, and fit the bottom rail.

Attachment 11621