Is it near one of the ends or in the middle of the table. Either way it's worth contacting the vender about.
It would sefinately mess with the straightness of that axis. For most projects it probably would not matter, but where both ends of a longer piece are required to be in the exact same plane it could cause an error. If it were me and I had shelled out my hard earned cash I would opt fot the replacement. The only question I would have is whether or not this is a common occurrence and if it is why is the factory allowing it to continue to happen. Have you tried to measure any difference it might have in following the same plane? You should be able to chuck up a DTI and get a measurement by just running the table full length of that axis. If you can live with the variance and it is a big hassle I would at least ask for a reduction in the price just to make it more palatable. Just my thoughts, maybe one of the old timers can chime in and tell us what the consequences might be or not.
Bob
Bob not quite sure I follow. The groves are cut vertically in the table ,but your asking me to check the table horizontally? I did put a vise on the table, and indicate it, across the face, and the top of the non moving jaw. The best I could get it was .0015, but that was only a length of 6.3"
What I see are two mill cuts that begin to lead off on the side of the T slots. While I often use the T Slots to align work, I never depend on them, indicate anything that needs precision. An assumption that this is the only error, however, could be dangerous.