(Pete Logghe) wrote in message om...
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.

Take a look at:
http://home.earthlink.net/~bottlbob/

Scroll down to the tramming tool.
Slick idea....
I saw a divice that was a rotating disc that you put in your collet
on your bridgeport quil. As one side of the 8 inch disc got closer to
the table it would shine a blue light about 120 dagrees on the edge of
the disc perimiter. If it was two far away form the table , .020" then
is would shine red. When you got the head tramed in it would glow
yellow 360 . It was about $250 but it was fast.
Just a differnt way. My table has so many holes and mistakes in it I
need to use a round disc to make up for all the milling disasters.
Don Huseman