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Drawbore in Yellow Pine?

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Forum topic by Lsmith3023 posted 07-14-2018 12:37 AM 849 views 0 times favorited 4 replies Add to Favorites Watch
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Lsmith3023

17 posts in 420 days


07-14-2018 12:37 AM

I am trying something new. I’m building a farmhouse table for my Daughter-in-law. I have glued up the top and I am going to breadboard the ends.
I would like to drawbore the Mortise joints but I have been seeing conflicting information on whether it would be a good idea or not. I know i’m working in softwood but will the drawbore add any strength to the joint or should I just rely on the M&T and glue? I am using a Tongue and groove the length of the end and cutting tenons beyond that


4 replies so far

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bondogaposis

5452 posts in 2770 days


#1 posted 07-14-2018 01:24 AM

Draw boring in pine is likely to split the breadboard. If you do it, make the offset very slight. Don’t glue the whole length of the breadboard, just the center.

-- Bondo Gaposis

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JADobson

1443 posts in 2530 days


#2 posted 07-14-2018 03:49 AM

I’ve done plenty of drawbores in pine. They work fine. This one is in a leg but I’ve done them in breadboards too. The farmhouse table in my projects has drawbored breadboards.

-- No craft is very far from the line beyond which is magic. -- Lord Dunsany — Instagram @grailwoodworks

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Pat3

114 posts in 2298 days


#3 posted 07-14-2018 04:47 AM

I am also in the middle of making a farm table for my daughter, using Port Orford Cedar, which is a very soft wood. I drawbored and wedged M&T the feet to the legs, end braces to the legs and the stretcher to the legs.

There were no issues with the drawboring.

I will also be drawboring the bread board ends for my top as well, and I do not expect any problems with those joints.

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Robert

3436 posts in 1899 days


#4 posted 07-14-2018 01:29 PM

Draw boring is a timber frame technique that has applications in ww’ing, especially joinery where glue cannot be used.

For that reason, they are necessary in a breadboards. Simply pinning a bb end will risk loosening as shrinkage or movement occurs. Keeping the pins with 3/4” or so of the edge minimizes gaps from shrinkage.

You can certainly drawbore soft wood you just have to be very careful not to over do the offset (no more than 1/32’).

If you’re mortises are well fitted, drawboring has no advantage over gluing and pinning. Pinning a tenon adds trememdous strength.

While I’m thinking about it, be sure that yellow pine is dry and well acclimated!!

-- Everything is a prototype thats why its one of a kind!!

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