I have made an animation of tank treads animating along the x axis. Once I try to animate from the 51st frame to rotate into the Y axis, the whole mesh turns into chaos. What am I doing incorrect? I have tried merging the modifiers, but the animation of the treads then all become one mesh. I also saw this post but it doesn't show how to rotate the treads along rotating axis.
If you parent the object to the curve, or if you parent both the object and the curve to an empty, it will work fine, as the axis will remain relative to the parent. If you don't, the object will go wild as you'll change the deform axis. Note that I also had to animate the tank treads on the right axis so that it moves along the curve, but it is the empty that makes it rotate.