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timber framing with pegs question - peg sizes

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Forum topic by metroplexchl posted 01-31-2018 03:44 AM 425 views 0 times favorited 7 replies Add to Favorites Watch
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metroplexchl

85 posts in 510 days


01-31-2018 03:44 AM

I am building a workshop with joinery and pegs. I’ve been collecting the posts and beams and am about to get the foundation started. I am curious about pegs though.

I’ve got 6” and 8” white oak beams that will be pegged. but what size pegs should I use? So say I use a 1” diameter peg, should I make the hole a hair smaller in diameter than the peg or will the slight offset of the wholes between the mortise and tenon be sufficient?

thanks again!

-- What ever you do, be good at it. -Abe Lincoln


7 replies so far

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metroplexchl

85 posts in 510 days


#1 posted 01-31-2018 01:36 PM

I saw Wranglerstar on youtube say that he made the peg smaller than the hole? That doesn’t seem right, but I can’t find any info on it. Just a lot of videos and explanations of people putting the peg in the hole…..but never mentioning the peg vs hole size relationship.

-- What ever you do, be good at it. -Abe Lincoln

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tomsteve

880 posts in 1425 days


#2 posted 01-31-2018 01:45 PM

id saw get some scraps and test. seems that if the beams werent thoroughly dried to a low MC, the beams would shrink around the pegs locking them in pretty good.

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rwe2156

3174 posts in 1687 days


#3 posted 01-31-2018 03:34 PM

If you’re doing draw bores you’ll use tapered pegs so it doesn’t matter that much.

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

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Harryn

74 posts in 2794 days


#4 posted 01-31-2018 04:29 PM

1” pegs seem to be the norm on our old Wisconsin barns. Many were made with an octagon shape and then Slightly tapered with an axe.

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metroplexchl

85 posts in 510 days


#5 posted 01-31-2018 06:53 PM

Great info. I will use tapered pegs as I’m draw boring the beams. Sorry I should’ve been more clear.

If I have a 1” hole, what diameter peg should I use? Some say 1” peg goes in 1” hole. Some say 1 1/16” peg for 1” hole. Others say 15/16” peg for 1” hole.

Im using already dried white oak beams, so there will be no shrinkage on the beams.

-- What ever you do, be good at it. -Abe Lincoln

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HerbC

1790 posts in 3065 days


#6 posted 01-31-2018 09:44 PM

From the Timber Framing forum at the Forestry Forum:

“Pegs should be one half the tenon thickness. So a 2” tenon should have a 1” peg, and a 1 1/2” tenon should have a 3/4” peg.
Now sometimes a 1” peg will take away too much wood and therefore a smaller peg may need to be used as long as it’s strength is high enough as to not fail during it’s load carrying capacity.”

If you haven’t been there before, the Forestry Forum is a great place with lots of good information.

Herb

-- Herb, Florida - Here's why I close most messages with "Be Careful!" http://lumberjocks.com/HerbC/blog/17090

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metroplexchl

85 posts in 510 days


#7 posted 01-31-2018 11:59 PM



From the Timber Framing forum at the Forestry Forum:

“Pegs should be one half the tenon thickness. So a 2” tenon should have a 1” peg, and a 1 1/2” tenon should have a 3/4” peg.
Now sometimes a 1” peg will take away too much wood and therefore a smaller peg may need to be used as long as it s strength is high enough as to not fail during it s load carrying capacity.”

If you haven t been there before, the Forestry Forum is a great place with lots of good information.

Herb

- HerbC

Great info! Thank you, sir. I have already tried to register with the Forestry Forum, but they really scrutinize the requests and haven’t gotten back yet. I hope I make it!

However, my question is about the relationship between the diameter of the peg and the diameter of the hole it goes in. So, if I have a 3/4” peg, what size hole should I drill in the mortise and tenon?

-- What ever you do, be good at it. -Abe Lincoln

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