Machinest Engineering square

[Bod]

How can these squares be adjusted?
I've just cleaned up a carboot purchase, to find its not square.
Its out by almost 3mm over 230mm. Checked by flipping over against a straight edge.
It's a Rabone Chesterman No. 9/9"/20cm BSS 939, so should be better than this, there is no sign of abuse, or damage. Joint is perfect.
Do I just take a file to it?

Bod

 

[Beau]

Out by 3mm :shock:

Seems a massive amount and not show at the joint. You certain the straight edge was good?

 

[transatlantic]

https://www.youtube.com/watch?v=tyIgII7QMdw

Although if it is as bad as you say - is it worth it?

 

[RogerP]

If the joint isn't riveted (probably not) a few judicious taps will put it right.

 

[Rorschach]

Bin it if that's bad, a machinist square should be accurate to within hundredths of a millimetre over that distance.

 

[sunnybob]

Tighten the handle up real tight in a good vice and whack the blade with a solid club hammer onto a piece of wood laid on the blade.
You have nothing to lose.

 

[ED65]

https://www.youtube.com/watch?v=tyIgII7QMdw

The very one I was about to link to! It's such a small world sometimes, I only watched this yesterday or the day before.

Bod, is the measured error between the two drawn lines fully 6mm??? Even if the discrepancy between two squared lines is 3mm, making the square 1.5mm off, that's still amazingly bad for an engineer's square. Hard to imagine how it got that far away from dead-on 90, although this sort of error is regularly found on old wooden-stocked squares... as well as some new ones

If it is actually 3mm out and bashing with a hammer does nothing to reduce this I would consider it scrap and just put it aside for the steel. The blade will make superb raw material for a scratch stock, or you could turn it into one or more smaller card scrapers.

 

[Bod]

Seeing I paid less than a pound, it's scrap! Made on a friday afternoon, I wonder what trouble it's caused in it's life.
There is no damage, wear, or major rust. Just made wrong.
Thanks all.

Bod

 

[Dovetaildave]

If you're going to bin it,............... could the steel be used in here ;
can-anyone-identify-this-tool-t101676.html
as a scraper (hammer)

Dave