Originally Posted by cowcowlee  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. |
have you tightened the Z gib yet? thats really where you need to start. without checking that 100% youll never be able to track down the issue.
the column will have a little flex for sure. so will the head. so will the tool, etc. there might be a little play in the Z ball screw breaing mounts.
you need to go systematically through each one to find out which is the biggest cause of flex, fixing them along the way if possible.
my little kx1 had loose z gibs, and play in the ball screw mount on both the z and y. when i tightened it all up, there was virtually no meaningful flex left without exerting more pressure than the machine sees while running.