Wood joinery for CNC

After making the Steltman chair, I reflected on how to adapt parts for the 1F, particularly the joinery. The more I learn, the more the gaps in my knowledge of the fundamentals of designing for CNC are evident :blush:

As a learning exercice, I decided to manufacture some of 50 digital joints for wood as documented by Jochen Gros. Mr Gros shared DXF files but, as I use Fusion 360, I decided to create parametric models. I also milled the CNC joints from scrap wood.

I’ll share the results in the forum, hoping to help some fellow 1Fers. I started with the Secret Fingertips Tenons which Mr Gros describes as:

The secret version of the Fingertip Tenons Joint leads to a rabbet at the front edge of the assembled joint. From a design-oriented viewpoint, this rabbet is an interesting design detail on furniture. For traditional wood and furniture construction the rule was not to let a joint show, however compli- cated its execution might have been. But today, in the age of industrial furniture construction with its invisible connectors in the form of dowels and la- mellos, times have changed. The demonstratively shown joints are a sign for the quality of furniture made by a craftsman.

Queues invisibles.f3d (446.9 KB)


Hey Benoît,

thanks for the link, there’s inspiration in there.

I think this should be interesting for everyone beginning with wood cnc in the forum, at least those interested in wood construction and furniture making (you know, the things beyond signs and coasters).

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If you leave a little lip across the bottom it’ll fill that corner. Or better yet, leave a lip on both parts and cut them to a 45° so the joint is right on the corner.

@Aiph5u reminded me of these joints.
I have have been busy on a house renovation project of late and had little time for these “learning exercices” between flooring and painting. I had made some more joints last year however. Here’s a fun one, the Double Jigsaw-Hook Corner which Mr Gros describes as:

The Double Jigsaw-Hook Corner is a decorative corner joint with tensile strength. The hook that is fitted to the cross bar needs to be equipped with sufficient projecting wood to enable it to withstand the tensile stress. The hook at the cross bar also secures the joint against shifting sideways. The jigsaw tenon can take on a multitude of shapes, geometric, organic, or floral depending on to where it is applied.
Like for all frame joints, it is important that the width of the framing timbers does not surpass 10 cm.

Tenon Crochet.f3d (400.2 KB)