The picture looks familiar but I can't recall the details. I think
there was a "wood puzzles" book which included this novelty joint. (Was
it a book sold by Woodcraft?) Anyway, it's a curiosity. Check it out
and tell all.
I've seen it as well. Both pieces are cut on a diagonal but when put
together they look like a dovetail - though they really aren't (if memory
serves...). I'd have to find the web page that breaks it all down too. I
couldn't explain it any better right now than what I've just said.
I have seen it too, just as you describe.
The end result is an illusion, so to speak. Our minds are trained to think a
typical dovetail, but the wood is cut in a way to simulate a dovetail, when
it is really a form of slip joint.
OK - I'm going to give this a shot from memory. What you see is a box with
apparently two dovetails - on adjacent sides. What's really there is a
sliding joint. Imagine that the dovetail end you are seeing on one side
runs to the other one you see. What makes the illusion work is that the
ends of the dovetails are cut on an angle - even with the plane of the side
of the box. If you looked at the box straight on, but looking into the
corner instead of at one of the sides, you'd see the dovetail profile with
the ends cut off-square. The top has the dovetail slot to match. It slides
Damn - I don't know if that made one bit of sense.
It does. But it falls into the category of "if you don't know the
answer to the question that was asked, give an answer you do know to a
question that was not asked" <g>. I like the puzzle you are referring
to, and its deceptively simple solution. But I'm pretty sure that is
not what the OP is asking about. Look again at the cited ebay page,
and see if there is any way you can see the puzzle you are talking
about morphed into this one.
Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently.
Another possible way to make this joint is to make the strip of wood across the
top of the joint between A and B thin enough to be easily bent. Then the piece
which is labelled A B would be flexed open and the moved pass the tails in the
other piece and then first piece would then be bent back closing the joint
around the second piece.
But where's the fun in that? I mean it doesn't even use
- a lathe
- a block plane
- a shoulder plane
- block rabbet plane
- skew chisels
- bench chisels
- paring chisels
- micro belt sander
- drill press
- 20 special router bits
- a precision router lift
- precision router table fence
- oscillating spindle sander
Where's the fun?
Guess there really is more than one way
to skin a shop cat push stick. Who'd've
Yeah, there was an episode that talked about this joint. If you look a
the end grain of the piece with the tail cut in it, it's a square cut
which creates the illusion that it's a square cut all the way back to
shoulders like a normal dovetail would be. That's impossible though.
What's really going on is that the sides of both dovetails are beveled
so that where the dovetail attached to the rest of the board, the sides
of the tail are at a 45 degree angle. The board simply pushes straight
in from the back. Between the two dovetails is sort of a V-shaped
valley with a matching one on the other piece. It's difficult to
describe, but easy to understand once you see it.
One possible way to make this joint would be for the hidden
cuts to be circular arcs. The sort of thing that would result from
a rotated (turned) piece which then has been cut with flat sides
The axis of rotation would be along a line on the surface between
the labels A and B.
If so then there would be arc shaped cut inside (under) the
arms of the T. This view is not given in the pictures.
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