Set squares ?

[Blister]

Hi

Can anyone give any advice on checking to see if a set square is square ?

I have about 7 all different sizes and would like to know they are square before relying them

Cheers

Allen

 

[Vann]

Draw a line using the square in the normal way. Then flip the square over and see if the 'blade' is parallel with the line you've just drawn. If the line is parallel then the square is 'square'. If not then the angle shown is double the error.

Clear as mud?

Cheers, Vann.

 

[woodbloke]

Vann's description is the generally accepted way to check a standard woodworking square - Rob

 

[bugbear]

The surface you're referencing from (putting the stock on) to draw the check lines needs to be at least as straight as the acccuracy you're trying to check to.

BugBear

 

[newt]

B.B's point is often over looked when carrying out these checks.