I purchased half of a machine that someone started building. after finishing the build (about %75 of it), i can cut and run G-code great. however my Y axis is out of square by about 1/8"/ft. the previous builder welded the gantry and the rails to the table, so i believe he did so out of square. I have read that it is possible to correct an out of square axis via mach 3. is this advisable? If so, can anyone point me in the direction of a tutorial perhaps? lots of searching with nothing that works for my machine. or is it better to try to correct the axis mechanically? the problem is tweaking the machine mechanically will be nearly impossible with how the gantry mounts are set-up. see attached pictures of the gantry mounts and the motors. i have a rack and pinion in the long x direction, and lead screws for z and y. all powered my NEMA34s. any help is greatly appreciated, thanks.