Shelf supports with double tenon jointsI needed to build another shelf for the basement. Rather than use the same design as my other shelves, I decided to make some shelf supports using double tenons joints. I figured this application was also a good one to put the strength of double tenon joints to the test.
Usually I round off my tenons to fit in the mortises from my
slot mortiser, but for a change, I decided to square
out the mortises. These are 3/16" tenons, so 3/16" chisel is perfect for squaring out the
ends. The force required was just a bit more than I could easily push by hand, so I ended up
using a mallet.
I cut the double tenon using my delta tenon jig. The space between the tenons I cut out by making
a series of cuts to remove all the material. I ended up doing the same for the shoulders of
the tenon, seeing that these were narrow enough that two passes with the saw blade was enough to remove
all that was needed.
Checking the fit of the double tenon. Double tenon joints are a bit more finicky than regular tenon joints, because both tenons, and the distance between them needs to align precisely, rather than just ensuring that the tenon has the right width.
And here's one of the shelf support brackets mounted on the wall. I just screwed them into the sides
of the studs on the unfinished side of a wall.
For the shelves themselves, I used some old bi-fold closet doors. These are just strong enough for the job. Not ideal, but I had some lying around, so there was no need to buy anything.
Here you can see the shelves already partially loaded with junk.
See also:Woodworking website