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T square not square

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LyNx

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I recently bought a 230mm Marples T square but it's not square. It's around 0.7mm out in it's length. What sort of tolerances are there on squares.

I have emailed the supplier and just waiting for a reply.

Andy
 

Greenfield Bob

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Andy, at one time I had 5 squares, not T squares, but 3 of them were not square. I just threw them in the trash. When I buy a square now I take a square that I know is good with me and check the one I want to buy, have found a lot of bad ones.

Bob
 

ProShop

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Andy,
I stopped using woodworking squares some years ago.
I use engineers squares now. The inside and outside faces are machined/milled to very fine tolerances. You can even buy them accuracy certified.
I have 3 Moore & Wright ones even a 12" (a bit heavy) :D
excellent accuracy.
 

Ian Dalziel

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I am with Felderman here,
Woodworking squares are notorious for being out and i only ever use engineers squares.....even when i use an adjustable square i usually check it before i use it.
I once bought a 600mm T square and first time i used it was to cut a worktop...I scribed the line cut the top and low and behold it was 3mm out over 600mm.....put away never to be trusted again


Ian
 

LyNx

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Looks like i'll have to take this as a lesson, and buy the engineering squares next time. Funny thing, it that the 600mm roofing square i also use is actually square and i would have expected that to me a few mill out :?

Still no reply for the suppliers so i think i may have to write this one off

Andy
 
A

Anonymous

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With Felderman all the way

check that they have a BS stamp on them too as this guarantees accuracy
 

LyNx

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the problem being, is that if it ordered of the tintanet then it must be the suppliers duty to check these things.

I know it was only £14 but it shouldn;' be the point. Still no news back from the supplier :evil:

Andy
 

jasonB

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Don't forget that however good your square is, it wont stay that way if abused or dropped, what you need is something like This that can be adjusted.

I am sorry for posting this link as looking around their site may get some of the members overexcited :wink:

Jason
 

Steve Maskery

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LyNx

By T-square I assume you mean a draftsman's T-square? In that case, I would have thought that 0.7mm was acceptable, because the square doesn't do anything except provide a base line for horizontals and a reference for the (very much more accurate) set squares.

Of course I agree that it would be nice if all squares were just that, but horses for courses, I'm not at all surprised by the error you have found. I don't mean to be harsh when I say it's not the right tool for the job.

Having said that, I may have misunderstood you entirely (not for the first time today - just had to do some grovelling), in which case I wish I had kept my big mouth shut.

Cheers
Steve
 

garywayne

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Hi Andy,

I have a roofing square that was out when I bought it. What I did was to cut part way through at the angle, then whacked it into square using the 3,4,5, system,(the greater the numbers the better, eg 9,12,15). I still check it every time that I use it, but I have not had to adjust it for quite a while.

Hope this is of some use.

ATB Gary.
 

devonwoody

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Oddly enough I purchased one of those roofing squares at a kind of bazaar type emporium(high class junk) for 99p and I check my other squares with it .
I check it with those engineer metal squares.
 
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