LumberJocks

Box joints

  • Advertise with us

« back to Joinery forum

Forum topic by lbtrail posted 01-28-2015 02:56 PM 683 views 0 times favorited 5 replies Add to Favorites Watch
View lbtrail's profile

lbtrail

2 posts in 714 days


01-28-2015 02:56 PM

I want to build drawers using box joints. My question is can I cut 1/2 & 3/4 stock at the same time like you would do making dovetails.
Thank you


5 replies so far

View bobro's profile

bobro

308 posts in 774 days


#1 posted 01-28-2015 03:35 PM

If you stand a 3/4 thick board on end and run it over a dado blade or router bit 1/2 up from the table, a 1/2 thick board run over the same blade or bit will fit in to the 3/4 thick board at a right angle as far as the depth of the cut, but it will fall short 1/4 as far as the thickness of the 3/4 board.

So, no. BUT if you cut all your fingers at the depth of the thickest boards, 3/4 in this case, then you can trim the resulting overhanging 1/4 off the thicker board after joining. You just have to make the thicker boards 1/2 (that is, 1/4 + 1/4) longer than the final dimension.

-- Lao Ma: You are so full of anger and hatred. Xena: Everybody's gotta be full of something.

View ADHDan's profile

ADHDan

800 posts in 1572 days


#2 posted 01-28-2015 04:52 PM

Not that bobro has it wrong, but (maybe) to restate it more simply: in a box joint, the fingers need to be at least as long as the thickness of the board they mate with. So, if you cut all of your fingers based on the thickness of your thickest board you will be fine.

-- Dan in Minneapolis, woodworking since 11/11.

View waho6o9's profile

waho6o9

7173 posts in 2041 days


#3 posted 01-28-2015 05:04 PM

View lbtrail's profile

lbtrail

2 posts in 714 days


#4 posted 01-28-2015 05:55 PM

Thank you all for your info. It helped a lot

View bobro's profile

bobro

308 posts in 774 days


#5 posted 01-28-2015 07:30 PM



Not that bobro has it wrong, but (maybe) to restate it more simply: in a box joint, the fingers need to be at least as long as the thickness of the board they mate with. So, if you cut all of your fingers based on the thickness of your thickest board you will be fine.

- ADHDan

Yes- if you gang the boards, which is a good idea for speed and accuracy, you have to go to the depth of thickest board, which means you’re going to have some overhang to trim off, and you have to compensate beforehand for that, when cutting the boards to length.

By the way, I learned this the hard way when I was a teenager 30 years ago. “Face-palm”. My dad taught me all kinds of basics but then let me make my own mistakes, in order to learn how to think ahead and not just work by rote.

Oh- when you are running the ganged boards over the blade or bit, it’s a good idea to back the stack with a sacrificial board, because it’s possible to get blowout on the edges of the fingers of the last board.

Let’s see…yip, on the mass-produced finger-jointed box my wife got there’s a blowout exactly like I did on my first finger joints.

-- Lao Ma: You are so full of anger and hatred. Xena: Everybody's gotta be full of something.

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