On Fri, 22 Dec 2017 17:18:28 -0700, Bob La Londe
wrote:

On 12/22/2017 1:48 PM, Bob La Londe wrote:
On 12/22/2017 12:21 PM, Bob La Londe wrote:
I'm starting to get some chatter on the KMB1 when profile cutting
along the Y-axis, but not when cutting along the X-axis.* It doesn't
matter whether its climb milling or conventional milling, and it
doesn't matter what direction.* My first guess is X-Axis ball screw
assembly and or bearings.

Does not look like a pleasant job to get it out.

I wonder. Hope more likely that maybe I just need to adjust the gibs. I
have never adjusted them, and to be honest I never considered whether or
not the previous owner ever did since I bought the machine from a third
party on behalf of his widow.

Now how to adjust the gibs. Hmmm... The X axis seems pretty straight
forward. There is a visible screw at each end of the gib. Not sure how
to get the feel for it though. On my little machines I can disconnect
the lead screw and push the table around by hand, but the table on this
thing is significantly heavier than that. Then there is the Y axis. It
looks like the gib and adjustment screws must be hidden under the wipers.



Nope. Didn't fix the chatter at all. Back to examining the lead screw
setup I think.
Check the backlash. It may be that a thrust bearing has become loose.
I had this happen on a big Index mill. The nut that loaded up the X
axis thrust bearing had backed off.
Eric