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Discussion Starter · #1 · (Edited)
A general questions regarding how square a square is

normally a squares squareness is given something like .005 or .006 (when you're buying it)
which I have always taken as the deviation from square over the length of the blade
Hence if you have two squares, one with a 4 inch beam & one with an 8 inch beam and they both have a number supplied by the manufacturer as ".005" then the 8 inch one should be more accurate or closer to square when measuring a 6 inch board.

now the question

Somewhere-- I remember reading that the number (.005) is actually measuring the PARALLELISM of the beams edges not the degree of deviation from 90 degrees. I know I read it on a manufactures web site while searching for an affordable square

Anyone with expertise in this care to weigh in & enlighten me??

thks

smitty
 
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