I’ve been working through assembling my new machine and I’ve run into a bit of a snag while attempting to install the XZ gantry on the X-axis. After about an hour of adjusting the eccentric nuts, I still wasn’t able to get the fit correct. One end of the rail was always so tight that it is difficult to move the gantry at all, or the other end of the rail would be so loose that there is enough slop where I can rock the gantry back & forth on it.
I started taking some measurements, and it appears that one section of my X-axis rail has a “bulge”. When I took out the calipers, the distance between the rails where the v-wheels should sit varies by as much as ~0.7mm along the length of the rail. Most of the rail seems to be around 170.0mm from edge-to-edge, but in one section near the end it has a minimum distance of 170.6 - 170.7mm.
Is this variance within acceptable tolerances? If so, is there anything I can do to get this gantry to ride smoothly along the entire length of the rail? Or what’s the best compromise if I have to choose between play at one end or the other end being extremely tight?
I was thinking I could possibly clamp the area that is too tight and attempt to bend it in just a bit so that everything is smooth, but the wife told me I need to wait to hear from the community before I attempt something like that, lol!
Thanks for any advice!