I know its obvious but double check the level of the machine and make sure all feet (depending on manufacturers spec) are supporting the appropriate amount of weight.
Was the machine out of level from the initial installation, or because the floor moved afterwards?They did re-level the machine. It was out by a lot and the surface finish did improve when they did that.
They keep getting it a little better, but it's still not 100%.
Was the machine out of level from the initial installation, or because the floor moved afterwards?
If you are still having trouble maybe there is a way to rule out the floor once and for all.
If you core drill a hole in the floor near the machine you can inspect the sub grade and detect if you have a void. Maybe drive a post in and put a DTI on it. Epoxy a little target to the floor and zero the indicator. Run the part and watch the indicator. You can check vertical and horizontal movement.
If there is a void I'll bet one of those driveway guys can foam it.
also I would check ALL the electrical connections, drives, contactors, plc ect... My factory tech (although lathes with Siemens) on install goes around and tightens everything after an install in the cabinet. He's had issues on new machine where something strange was happening and after re-tightening everything cleared up the problem. and does the machine have scales?
I couldn't do this next test very scientifically but I decided to try and lift up on the head of the machine while the indicator was on the table. I could move the head almost .001" with one hand. With two hands I could move it multiple thou. I did the one hand test on my Fryer and it only moved 0.0003". One hand on a Haas and it only moved 0.0004". Got the head to move about a thou on both the Haas and the Fryer with two hands.
In the pocketing op it's interesting that the effect from Y motion "sticks" when switching back to X motion. Is it possible the Y way covers have a lot of drag and are pulling and pushing on the column?A little update.
I put an indicator in the spindle and jogged the machine in the x axis. The indicator barely moved. Very smooth.
I did the same thing on the Y axis and...well, not so good. The needle was jumping all over the place and vibrating like crazy on the initial moves, and then would smooth out after it was in motion for a little while.
This machine has linear roller bearings, btw.
X-axis smooth motion:
running a 2d pocket operation with the indicator zero'ed. Please excuse the poor camera work:
So maybe something loose in the Y axis? I didn't think to try and push on one side of the table to see if I could "skew" the table. I will try that next. Doesn't really explain the z axis head movement I can measure but who knows...
MTB is spending the day with me tomorrow. They're trying, but I need this machine making money!