I first came up with this joint for a student project several years back.  A one-off solution that solved her connection challenge.  Inspire to make a sample to evaluate for an end table project I'm contemplating.  

First try on my CNC for the projecting dovetails failed miserably.  Cut that end off, revised the file and double checked my setup on my CNC before trying again. This time the joint fit tight, and with a push snugged up securely. 

Scrap of cherry into a Mahogany scrap. 

4D 

Now posted on my blog:  https://4dfurniture.blogspot.com/2024/11/blind-double-dovetail-joint.html

4D

Cool !!  Same principal as inlays?  what's the tolorance between female and male cuts?

3 minutes ago, honesttjohn said:

Cool !!  Same principal as inlays?  what's the tolerance between female and male cuts?

As the dovetail slots taper, the tolerance when fully slid over is zero.  Drop in, sloppy clearance.  Slide over and it gets tighter until no play is left.   Not quite the same as inlays as there are open pockets in the joint behind each dovetail section where they dropped in.  Many years back when I cut a similar joint for a student's project the dovetail sections were straight.  No CNC to use back then. Using Aspire to draw up the toolpaths for clearance end mills and the dovetail bit looks considerably more complicated. One of those times when I wished I had an automatic tool changer.  Probotix now offers systems with tool changers.  If I could sell my current meteor I'd likely buy a significantly updated one from them. 

4D