I would talk to Tormach. I would not start drilling holes for adjusting screws. Have you tried removing the gib, cleaning and checking, then replacing. Make sure the adjusting screw does not (is not) running down the side of the gib. This happened to me on the Z axis.
I was in the shop today looking at my machine
and was wondering how one would adjust the gibs
if they needing adjusting. On my manual mill I turn the
gib screw until I feel a light drag and back the screw off
about a ľ turn.
But with no hand wheels how would you do this?
Well curiosity was getting the best of me so I grabbed
the X axes motor mount to see of I could feel any slack
in the table.
Well to my surprise there was a ton of slack!
I could pull and push on the X axes motor mount in the Y axes + - direction and see the table move!
The table looked like it was pivoting on the ball screw yoke.
It looked like the Y axes gib need to be adjusted so I made me a handle so I could move the Y axes by hand and adjust the gib.
I adjusted the gib until I felt a light drag it took about three full turns so I said that was easy and grabbed
the X axes mount again to see if the slack was gone.
The slack was no better, so I thought for a moment
and remembered reading the manual about adjusting
the Z axes gib, the manual tells you to tighten the Z
gib until it takes about 40-80 lbs of force to move the
Z with the machine powered down, I said to my self if
there using the Z gib as a ďfriction brakeĒ for the Z maybe itís ok to tighten my Y axes gib until my slack
is gone and ignore my old ďfeelĒ method.
My 14 year old son was in the shop so I give him a screwdriver and told him to apply light pressure
to the Y axes gib screw as I shook the slack, I could
see his hand move the gib screw in steps, it took about
3 full turns to get rid of the slack. I said to my self now I got it!
Now Iím curios to see how much drag is on the table
so I crank on my home made handle and there was a LOT of drag. If itís ok for the Z it shouldnít hurt the Y write!
I put the Y motor back on the machine and jogged the Y
and it sounded ok.
No Iím not finished hold on!
When I got my machine hooked up and running the first thing I done was check the accuracy and noticed that it
would loose a .001 on a direction change on the X an Y.
I would set my jog to .010 and it would hit dead on the mark every time I jogged in that direction. When I changed directions I would loose a .001 only moving the table back .009 but would move the table .010 dead on every time after that. I can live with that Iím not making
Now is where it gets good!
I put my indicator on the machine hopping to find my .001 loose in direction change to be gone but now instead of .001 I have .006 in direction change!
So I put my son back on the screw driver and had him back the gib off as I jogged the machine back and forth .010 wile watching the indicator until I was back down to my .001 in direction change and found the gib adjustment to be back where I started from and all the table slack was back as well.
Is it possible that there is to much taper in the gib
and it is only touching the ways on one end and thatís
a pivot point?
If this is the case I thought about drilling a tapping the casting outside the gib and putting some set screws with jam nuts to apply the gib squarely against the ways.
How would you handle this?
Or is this normal?