"Grant Erwin" wrote in message
...
snip---


If you have access to a surface grinder with precision angle plate then
clamp the short leg of the square to the vertical face of the angle plate
so the long leg is horizontal, and take a cleanup grind (very light) on
the long edge.

If your square is out, that is.

GWE

That doesn't address the inside of the square, which is just as important as
the outside. Fixing a machinist's square that isn't isn't as simple as it
may appear.

Harold