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 Post subject: The old cliche'
PostPosted: Fri Sep 09, 2016 7:17 pm 
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Joined: Sun Feb 21, 1999 1:01 am
Posts: 2425
Location: Rochester MN USA
The square peg in a round hole. Why on earth would you want to do that to a beautifully crafted piece of furniture?


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 Post subject: Re: The old cliche'
PostPosted: Sun Sep 11, 2016 3:17 pm 
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Joined: Mon Apr 11, 2005 12:01 am
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Location: Seattle, WA, USA
Hey Newtooth,

Presumably, to pull together a draw bored mortise and tenon.

Cheers,
Tom

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 Post subject: Re: The old cliche'
PostPosted: Fri Sep 16, 2016 5:40 pm 
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Indeed TMS is knee deep in carefully pared shavings.
A square peg in a round hole is used to fix a draw bored or a regular tenon in its mortise. The optimum choice for the peg material would be a wood specie that is harder than the pieces it will fix in the joint. The reason for that is so that the edges of the pin will cut into the bore it is going into and then the grain fibers will grab even harder than the long grain of a dowel. If the pegs are drier than the m&t material they will swell and become even tighter. A peg slightly tapered at the end by a pencil sharpener will facilitate the fit and a drop of glue at the entry point of the bore will help also as well as hasten the swelling of the dried peg. If the joint is a draw bore then things get even more permanent. A backer board should be used when placing pegs when possible to prevent the possible tear out.

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