.002 English or .002 mm? Very big difference. .002 mm is only about 80 millionths of an inch. Autocollimators are measurement devices used to measure flatness on a surface plate. It is called "shooting the plate". Autocolliminators are electronic now, and very accurate. They aren't hard to use, but pretty fussy - and the surface is going to have to be pretty smooth. I believe that the machinist handbook will give instructions, and a description of a grid pattern to use. A plate that large is going to flex, gravity wil affect it. So will heat. And after moving, it will probably change some more. I would shoot it after it has been installed, if it is a critical use item. A couple of items come to mind:
1) the plate should locate on 3 points. More is not better.
2) the plate clamping should be limited to the area within a triangle formed by the locating points.
3) A Michigan outfit, Mitchell surface plate, can check it for you, and they have certs. I guess that $500 or so would cover it? They used to do our plates when I worked for GM. I don't know where you are at, so I don't know if that is practical. There are other folks out there, but they are the guys we used to use.
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