Today I put a jig together to align the primary THK rail along the X axis. Holes were drilled and then tapped with using lots of cutting oil and the slowest speed on my cordless drill. I set the clutch on my drill near it's lowest setting and got all the holes done without breaking a single tap
Later the rail was placed on the frame and each socket head cap screw was installed so that they are all still loose but the heads are beneath the surface. This allows me to move the gantry back and forth to get at all the screws.
Late in the day I started positioning the X axis ball screw assembly, more on that in the next few days...