Seat & Leg Joinery
Once the seat is roughed out, and while the sides are still square, the next step is the joinery between the seat and the legs. This is extremely important not only for strength, but also for aesthetics. The design of this chair really showcases the joinery, so any imperfections or gaps will be very visible.
This involved using a dado set on the table saw, and a rabbetting bit on the hand-held router. In order to achieve a perfect fit, the roundover on the insides of the legs (a 5/8″ radius roundover) must exactly match the radius of the rabbetting bit (ie, you need to use a 1¼” diameter rabbetting bit) .
This shows the joinery detail for the front legs. If the width of the leg is perfect, the bits match perfectly, and the dado depth was perfect, you can achieve a nice flush fit all around:
Here is the joinery detail for the back legs. Here, a precise fit requires a perfectly square notch in the back of the seat, and precise dado depth and matching bit profiles:
Once the joinery is all complete, the chair can be assembled for the first time:
It finally starts to take shape!
6 responses so far ↓
1 sean de queiroz // Jan 6, 2008 at 2:15 am
i noticed that while the back legs on your rocker are pretty much straight up and down, maloof’s rocker has legs that are substantially splayed at the top crest. do you know how he does this. is the joinery at the seat done at an angle? i’m baffled.
2 Monty // Jan 6, 2008 at 6:47 am
Maloof uses custom router bits to achieve that splayed look on the back legs. I used a simple rabbeting bit to join the back legs to the seat, resulting in a 90˚ angle. The bits like Maloof uses can be found at Woodline. Read more about these bits here.
3 sean de queiroz // Apr 22, 2008 at 9:10 am
i’m wondering what kind of joint you used to join the rockers to the legs. if i’m not mistaken maloof dowels the arms to the leg posts–at least i can’t see a plug on the arm where he would use a screw like on some of his other joints. did you use a dowel to attach the rockers. i was thinking one way to use a screw would be to cover the screw with a final lamination after the rocker is already attached to the chair.
oh, thanks for the info on the maloof router bits. i went ahead and bought them because i really like the splay. it took me quite a while to figure out just how to make that joint with the other tools i have however. the people at woodline couldn’t help–strange to sell a product you don’t know how to use–i even wrote to sam maloof but got no response. i now think that maloof must have a specially ground stacked dado set for making the leg part of the joint. he can’t use hand tools to make the joint like i had to..
thanks
sean de queiroz
4 Monty // Apr 22, 2008 at 8:08 pm
I am using dowels (5/8″) to join the rockers to the legs. I would not want to attempt to plug a screw hole, since any slight irregularity in the finished surface would be detected as a “bumpy” rocking motion. Dowels should be strong enough – much better than a screw threaded into end grain.
5 Essen // Sep 30, 2008 at 7:58 pm
Could you not just cut the mortise in the front face of the back leg on a crossslide tablesaw jig with spacers on one side of the back fence to keep it from moving during the cut. Then for the inside face prop the leg up on a spacer on one side to make the proper 5 degree cut in? I would imagine that everything could be done with power tools, but the spot that mates with the roundover would be very close, but not exact in the seat-side of the joint. epoxy mixed with sawdust could hide this one little flaw. I have actually made this joint before in a different way… without any $75 special bits… but this seems easier than what I did. I made a right and left jig that held a router at an angle to the cutting surface. This is not how maloof does it , because his chairs don’t have that slightly narrower spot and “shelf” under the chair that mine did. The next time I do it, I’ll be adding a 5 degree wedge that terminates it’s point at the bottom of the joint to get rid of that shelf and allow some material for a nice contour on the inside edge of the joint on the topside. This is hard to describe without pictures, but I hope this makes sense and helps someone.
6 Graeme Smith // Feb 14, 2010 at 7:20 pm
Charles Brock glues additional thickness to the inside of the back legs, rips it at 6 degrees to a taper and then can dado the resulting surface with normal square dadoes to achieve an angled splay. The additional material is almost invisible once the job is done as it is nearly all carved away.
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