i've got my gantry assembled, including the x and z axes assemblies. before installing the screws on both axes I aligned the pipes so that the assemblies glided smoothly. once adding the screws, coupling them to the motors, and nutting them to the bearings on the other end, i'm finding that the z axis screw requires noticably more force to turn than the x axis. this seems strange to me. i probably would have presumed the opposite to be true if I had guessed.
i pulled a pipe out of the z axis so that it hung freely and it didn't seem to change things much. could it be simply that the z axis hangs down and puts force on the nut and thus requires more force to turn?
i'm using dumpstercnc nuts, in case it matters. maybe I need to reverse the nuts? I have it installed on the underside, with the flange up and spring side down.
even if i can't figure this out does it matter? i'm using keiling 387 oz motors.
thanks!