In this video I will show how I made this impossible dovetail joint.
It cannot be dismantled neither this way nor this way.
But it cannot neither be dismantled if I move both parts diagonally.
This is a curved impossible dovetail joint.
Like when we make any other dovetail joint, I have to route the tails in one side of the joint.
And then I have to route the sockets between the pins in the other side.
In this case I didn't get a perfect joint, but I think it is a very nice joint and I can't stop watching how the parts fit in.
To root this joint I make this box.
That nail will be the pivot pin.
I insert the nail in a hole I made previously in that board I have on the router table.
And I put the first workpiece in the box.
I turn the router on, and I use a dovetail router bit to route the first socket.
Previously I made some tests to make sure I will route the holes in the right place.
And this is the first socket.
I have just route this. Now I have moved the board on the table to the next position. And I will root here.
Like this I have routed the two sockets I need.
I don't have anything else to route in this workpiece.
Now, this is the second workpiece. And I will route the tails in this piece.
I've been estimating where to route, and I decided I will route the tails wider than needed.
I move the board to the next position. And I route.
Like this I get the socket between the tails.
But I already know that later I'll have to enlarge that socket.
For the moment I move the board, and I route the other side of one tail.
And now I route the other side of the other tail.
Now I have this unrouted corner, but if I route it I would also route this corner of the plywood box.
So it would have a lack of support when I put it on the board on the router table.
So I cut it with the marquetry saw and the chisel.
And I retouch it with a file.
Like this I get the two curved tails.
But they are too wide, so I have to retouch them in the router table.
Here I can see how much I have to route to each side of the tails.
So, gradually I move the board and I retouch the tails to adjust the width.
It is a laborious task, but finally the tails fit in the sockets.
I use two different dyes so it is easier to see the joint.
I sand the routed surfaces so they fit in gently and they don't jam.
And I apply some soap so both parts slide even better and they are easier to fit in and to disassemble.
And here we have this impossible dovetail joint.
As I mentioned before, I can't stop to assemble and disassemble it.
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