LumberJocks

how should I size tenons?

  • Advertise with us

« back to Designing Woodworking Projects forum

Forum topic by JesseTutt posted 11-03-2012 03:43 AM 1209 views 0 times favorited 4 replies Add to Favorites Watch
View JesseTutt's profile

JesseTutt

853 posts in 1572 days


11-03-2012 03:43 AM

Topic tags/keywords: question mortise and tenon sizing a tenon

I am going to build a new workbench this weekend. I plan to use existing 2×4s that I have on my wood rack. I need to get rid of them and make space for “real” wood. I was going to mortise and tenon joinery. My plan calls for through tenons on the horizontal rails connecting the front left leg to the rear left leg. The top joint will actually be a bridal joint and the lower a through tenon.

Assuming that the 2×4 is actually 1.5×3.5 I am planning on making a 1×3 tenon.

My question is “Are there any rules on how to size a tenon?”

-- Jesse, Saint Louis, Missouri


4 replies so far

View pintodeluxe's profile

pintodeluxe

4853 posts in 2275 days


#1 posted 11-03-2012 03:46 AM

Tenons are usually 1/3 the thickness of its stock. IE 1/2 tenon for a 1-1/2” board, although a little fatter is also acceptable. I usually plan for mortise sizes that correspond to my hollow chisel sizes 1/4”, 5/16”, 3/8”, or 1/2”.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View John's profile

John

47 posts in 1535 days


#2 posted 11-03-2012 05:53 AM

The 1/3 rule applies more to the piece that gets the mortise. ie, if you’re joining two pieces of 3/4” stock, you’d make the joint parts 1/4” thick so you leave enough meat around the mortise that it doesn’t split or blow out. If you don’t have to worry about the mortised piece, then the bigger the tenon, the better, as long as you leave enough shoulder to firmly register the joint.

So for a 2×4 going into a mortised 4×4, a 1×3 tenon is fine. Same if it’s going into the wide side of a 2×4.

View Rick M's profile

Rick M

7910 posts in 1841 days


#3 posted 11-03-2012 06:15 AM

Hmm, I’ve always made my mortises 1/2 the stock (or closest chisel size), so a 3/8 mortise in 3/4 stock. Maybe I’ve been making them too big?

-- http://thewoodknack.blogspot.com/

View cutworm's profile

cutworm

1075 posts in 2255 days


#4 posted 11-03-2012 10:56 AM

I’m told that the tenon length should be twice the tenon thickness.

-- Steve - "Never Give Up"

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com