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 Post subject: What is a...
PostPosted: Mon Apr 19, 2010 5:05 pm 
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...Joiners pin, how and what is it used for?

Ralph :wink:

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PostPosted: Mon Apr 19, 2010 5:08 pm 
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Similar to bench dogs?

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PostPosted: Mon Apr 19, 2010 5:31 pm 
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I had 4 of them screwed into my hip as a kid.

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PostPosted: Mon Apr 19, 2010 7:04 pm 
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Hey Ralph,

Is that the same as what we would call a, drawbore pin, in american english?

Tom

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PostPosted: Tue Apr 20, 2010 4:31 am 
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It's a pin used to keep the tenon in the mortise.

They were called "treenails" around these parts, used in
timber frame construction until the mid 1880"s.

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PostPosted: Tue Apr 20, 2010 5:11 am 
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I think it is similar to a warrington pattern hammer.

but hey who knows?

eric


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PostPosted: Tue Apr 20, 2010 9:37 am 
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Steel pins use for marking the dowel centers before drilling.


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PostPosted: Wed Apr 21, 2010 3:46 am 
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Yes Tom it is a drawbore pin so you get a point for that answer but I should have asked for a description of it... For those who don't know what it is:

Image

Without the benefit of scale you could be forgiven for thinking this is just another awl. But at a shade over 420mm (16 in) long and a shaft diameter of 12.7mm (1/2 inch) at its thickest this is no lightweight marking tool. Used mainly in joinery (in the English sense) and outdoor carpentry this monster of a hand tool is intended for the heaver side of wood jointing.

It is used for ‘drawing’ the shoulders of a tenon tight up against the mortised piece of a mortise and tenon joint. This is usually a through joint where the tongue of the tenon is cut deliberately long. The joint is fitted together and the point at where the tenon emerges from the mortise a line is marked. The joint is then disassembled and a 12.7mm (1/2 in) hole is bored through it. The further back over the line the hole is bored the tighter the Drawbore pin will pull the joint closed. The joint is reassembled and the pin forced through the hole as far as hand pressure will allow.

The joint is now being held together by the drawbore pin. A hole is now made through the walls of the mortise and the tongue of the tenon, into which a securing dowel is driven The drawbore pin is removed and the protruding length of tenon sawn off. This sort of joinery is useful where shrinkage of the wood is to be expected.

Ralph :wink:

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