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PostPosted: Wed Dec 12, 2018 12:19 pm 
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This has come up here and elsewhere a few times, and as I came across this diagram a few days ago (in a book published in 1939) I thought I'd scan it and reproduce it:

Attachment:
How to Check a Square 001_02.jpg
How to Check a Square 001_02.jpg [ 37.39 KiB | Viewed 823 times ]

This works equally well for try squares and combination squares, but note that you should always do the check using the same edge of the blade because cheaper squares in particular often have out of parallel blades. You'd be surprised at how inaccurate cheap squares can be. Also worth re-checking periodically as squares can go out if dropped, thrown around in the tool box/back of the van, etc

Also handy is this diagram (from the same book) highlights why a lot of site carpenters use a combi square over using a try square:
Attachment:
Uses for a Combination Square 001_02.jpg
Uses for a Combination Square 001_02.jpg [ 58.16 KiB | Viewed 814 times ]

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Last edited by Job and Knock on Wed Dec 12, 2018 12:32 pm, edited 2 times in total.

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PostPosted: Wed Dec 12, 2018 12:29 pm 
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........and with a combination square, always tighten the screw before checking, (and using).

Another tip for a simple try square: if you have repeated length marks to make when using a try square, (e.g. lock spindle centres), a bit of masking tape on the square will allow an easily seen pencil mark/s to be added and transferred.

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PostPosted: Wed Dec 12, 2018 12:32 pm 
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best checked on a machine strait edge as any curve on the edge used will transfer to the marked lines :lol:

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PostPosted: Wed Dec 12, 2018 12:33 pm 
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big-all wrote:
best checked on a machine strait edge as any curve on the edge used will transfer to the marked lines :lol:

Normally the edge of a sheet of MDF or plywood is pretty good. And as that's often what is to hand, not a problem

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PostPosted: Wed Dec 12, 2018 12:45 pm 
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They're handy, but I don't like them. I always feel I have to check them before using them.
Friend of mine bought a very expensive set about 20 years ago now, and the accuracy was sort of "ish"
The most accurate one I've got is a horrible die cast thing with galvanised blade and a screw clip that doesn't even pull the blade onto it's bed.


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PostPosted: Wed Dec 12, 2018 12:56 pm 
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I have to say that when they start to get a little sloppy in action (or more often they've been dropped once too often) I just replace them. The alloy stock ones don't last forever and are certainly not as durable as cast iron ones although they won't potentially shatter when dropped off a scaffolding tower onto concrete. About the only cast-iron stock model left at affordable price is a Stanley one (basically the old Rabone-Chesterman design) - but for years the mitre face on those was belt linished (why?) and therefore so-so for accuracy. Recently they've moved production of that item from Sheffield to China and gone back to a fully machined stock, but I haven't had one yet to check how good or bad it is. Maybe when I cream cracker one of my Bahcos

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PostPosted: Wed Dec 12, 2018 1:25 pm 
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I bought a NOS combination square a few months ago, the blade was out of square by about 3mm over about 10", worst I have ever seen. Was able to fix it though as other than that it was very nice, heavy and smooth to use. I have also corrected rafter squares and framing squares.


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PostPosted: Wed Dec 12, 2018 1:33 pm 
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The old Rabone one we had at work was accurate enough. It was in a case with the centre and angle stocks. It was only brought out for special jobs though. (In other words it never really got used!)
I can't remember which make the one my friend bought.
Axminster do a Starrett one
https://www.axminster.co.uk/starrett-43 ... are-119457
Which I now want!


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PostPosted: Wed Dec 12, 2018 9:33 pm 
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I still use a couple of old Rabone which must be pre-cira 1963 as that's when they merged with Chesterman
and they're still accurate checked on a surface plate and graded engineers square, a new Bahco I tried
was out from new and needed some work to get it right, considering Bahco are now in the Snap-on stable
not good.


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PostPosted: Thu Dec 13, 2018 12:24 pm 
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Very useful, that's the weekend sorted checking the squareness of my tools :help:
ah


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PostPosted: Thu Dec 13, 2018 1:04 pm 
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I used to have a combination square with the aluminium body but over time it wore and became sloppy so ended up in the scrap bin. Still got a couple of rabone squares that are going fine as well as a couple of solid steel engineers squares which are great iff a tad on the heavy side although I also have another couple of rabones that have lost their accuracy . They get used to sweep shavings and chippings off the bench. I also have a fairly cheap plastic handled square , no name on it , that has stayed true far longer than I thought it ever would. Like ayjay's square the blade has masking tape on it .


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