ok....I did some more measurement on the vertical column yesterday, it's really flex, especially much more easy to lean forword/backward then the left/right, that's why the much more chatter when milling in Y direction rather then the X direction I have experienced before, however still don't know the root cause, most of the possibility is the column's base plate since it's only locked down by 4 bolts, it may twist or life up on the edge while the force applied on the column. |