One is a very highly embarrassing confession. Along the lines of Gunner's own trailer tire passing him by at the red light.
The mill, as I mentioned, was chattering under what I considered to be moderate cuts. I wondered how come it was chattering.
Now I know why: The head is attached to the rigid ram by means of four socket head cap screws. And when installing the head, in general excitement, I forgot to tighten them. So the head moved somewhat under loads in X direction. Very embarrassing and humbling.
With that fixed, the mill is no longer chattering.
I have one more weirdness: under heavier cuts, the mill triggers a limit switch error for a reason that I cannot understand. But if I do not push it quite as hard, it does not do so. I tend to think that it is something related to the hardware of limit switches and maybe some vibrations.
i