In article , Don Foreman says...

That's the point: shim it so it's level and not twisted, rather than
shimming it to deliberately twist it to correct another
misalignment.

In this case often the shimming is done to counteract the
effects of wear, so the machine turns and bores straight.

To put this in perspective, the shims involved in getting
a small floor mounted lathe dialed in for the last thou
of accuracy over, say, a six inch long part, might be
0.015 inch at the legs. So the shift in the bed is going
to be a couple of thousanths or so. Not much.

Jim


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