Quote Originally Posted by mocha View Post
Z axis question... I've read that minimising the distance from the spindle to the Y axis is a good thing to prevent flexing. Is that it or are there other reasons to do this??
Increasing that distance clearly increases the turning moment which results in the magnitude of the forces on the Y-axis bearings being greater. Also, for the same reason, if the Y axis ballnut is not directly between the Y-axis linear bearings then, for forces parallel to Y, you will get a lot of deflection as the parts in between don't have to flex much at all - it just 'rotates' about the ballnut since the ballnut is essentially the only support in that direction.