"Jim Stewart" wrote in message
...
I often tilt the head of my mill and I'm looking for
a cheap and simple way to sweep it back into alignment.
I see that small surface plates are available with
.0001" accuracy. What I'm wondering is whether they
are accurate top to bottom. I don't know what the
technical term is for this tolerance, coplanarity
possibly? In any case, what I'm looking for is
a flat surface which can be put on my mill table
and be used to sweep it into alignment and whether
a small surface plate would do.

"What I'm wondering is whether they
are accurate top to bottom."
Short answer,no.