CR4® - The Engineer's Place for News and Discussion®

 Previous in Forum: Technology for the Rich and Famous: Anti-Paparazzi Shield Next in Forum: Calculating Cooling Water Velocity
Guru

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2760

# How to Make Double Dovetail Joints

09/22/2009 10:16 PM
__________________
Nothing worthwhile can ever be taught, it can only be learnt.
Interested in this topic? By joining CR4 you can "subscribe" to

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
4
Power-User

Join Date: Aug 2009
Posts: 206
#1

### Re: Double dovetail joint ? How is it done?

09/22/2009 10:32 PM

this is an old time carpenters trick. The dovetails are cut at 45 degree angles! they appear to be cut at 90 degree angles I will not look down my nose at this , because it takes a great degree of skill to cut the dovetails at 45 degrees This puzzle is similar to the 8x8 square that is cut 3 ways to produce a 5x13 rectangle which yields a 65 sq. in. from a 64 sq.in starting point The carpenters ,who build what the engineers design, are not as stupid as they pretend to be!! Best Regards, K

__________________
To Be Is To Do...Kant , To Do Is To Be... Sarte, Do Be Do Be Do... Sinatra
Guru

Join Date: Aug 2009
Location: Glen Mills, PA.
Posts: 2395
#2

### Re: Double dovetail joint ? How is it done?

09/22/2009 10:57 PM

I called this answer a GA. That's reasonable considering it is perfect.

I wish I had figured it out for myself though, I'm supposed to be good with puzzles.

__________________
In a time of universal deceit, telling the truth is a revolutionary act. George Orwell
Guru

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2760
#3

### Re: Double dovetail joint ? How is it done?

09/22/2009 11:17 PM

on the nose of course

__________________
Nothing worthwhile can ever be taught, it can only be learnt.
Power-User

Join Date: Aug 2009
Posts: 206
#4

### Re: Double dovetail joint ? How is it done?

09/22/2009 11:26 PM

Sorry my friend but I don,t understand "on the nose" All my Best, K

__________________
To Be Is To Do...Kant , To Do Is To Be... Sarte, Do Be Do Be Do... Sinatra
Off Topic (Score 5)
Guru

Join Date: Jun 2008
Location: USA/Europe
Posts: 4633
#11

### Re: Double dovetail joint ? How is it done?

09/24/2009 12:54 PM

Hi kay williams,

GA to you for a very complete answer.

Take care.

__________________
Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=\$=|O|=\$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
Guru

Join Date: May 2007
Location: Geelong, Australia
Posts: 1089
#5

### Re: How to Make Double Dovetail Joints

09/24/2009 3:08 AM

With a router, of course.

__________________
If there's something you don't understand...Then a wizard did it. As heard on "The Simpsons".
Guru

Join Date: Jul 2008
Location: Mallorca, Spain
Posts: 564
#6

### Re: How to Make Double Dovetail Joints

09/24/2009 4:14 AM

GA to Kay for such a prompt response.

I have seen this before as a Japanese carpenter's puzzle. It would be easier with Japanese saws as they are pull saws, thinner and have no set to the teeth making the cut much finer than a western saw.

This is how it is done...

__________________
En la casa del herrero, cuchillos de palo!
Guru

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2760
#7

### Re: How to Make Double Dovetail Joints

09/24/2009 4:25 AM

A cute puzzle isn't it .. i use it as an example of 'paradigm shift' in addition to the superb old lady/young lady example of Stephen Covey (always giving credit to the great man!) when i am training young design engineers. Thank you all who have responded to this one.. though i don't quite get the router remark?

__________________
Nothing worthwhile can ever be taught, it can only be learnt.
Member

Join Date: Oct 2008
Posts: 9
#9

### Re: How to Make Double Dovetail Joints

09/24/2009 9:22 AM

Hello there, kvsridhar,

The "router" remark refers to the tool that is often used to cut dovetails. The responder was just having a little fun with your question.

Best regards,

Guru

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2760
#10

### Re: How to Make Double Dovetail Joints

09/24/2009 9:30 AM

ah hah good one.. thanks .. pardon my ignorance .. like "can you lift an elephant with one hand? sure, as soon as i find one which has one hand "

__________________
Nothing worthwhile can ever be taught, it can only be learnt.
Guru

Join Date: Aug 2005
Posts: 4144
#8

### Re: How to Make Double Dovetail Joints

09/24/2009 6:56 AM

To turn this into a real puzzle you need to fit four sliding dowels:-

Drill smaller holes all the way through the centre of the dovetails initially, then drill bigger holes to required depth top and bottom.

Fit sleeves to dowels (or turn down larger dowels) to stop them falling out; put them in the holes, and, glue the top and bottom in place.

Push all four dowels into the holes, and, slide the two halves together.

Place the whole thing either way up, and the dowels will lock the two halves together.

The only way to get it apart is to jiggle the two halves until the dowels are loose, then, then spin the whole thing on the top right or bottom left (as seen above) edge so that the dowels each fly out fully into their own halves.

The shoulders, sleeves, top and bottom are just niceties to avoid loosing the dowels when the "box" is opened. You could just drill the smaller holes to the required depth from the "inside" then fit four cylindrical dowels.

__________________
We are alone in the universe, or, we are not. Either way it's incredible... Adapted from R. Buckminster Fuller/Arthur C. Clarke
Guru

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2760
#18

### Re: How to Make Double Dovetail Joints

09/25/2009 6:48 AM

Thank you. Excellent idea and great engineering drawings.

__________________
Nothing worthwhile can ever be taught, it can only be learnt.
Guru

Join Date: Jun 2008
Location: USA/Europe
Posts: 4633
#12

### Re: How to Make Double Dovetail Joints

09/24/2009 1:05 PM

Hi kvsridhar,

You have hade a good answer already but here is a detail of "how to" make the Dovetail.

--------------------------------------------------------------------------------------

# Image:Doubledovetailpuzzle3.png

No higher resolution available.
Doubledovetailpuzzle3.png‎ (179 × 318 pixel, file size: 31 KB, MIME type: image/png)

##  Summary

Woodwork Joints, public domain resource.

##  Licensing

 This file has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. This applies worldwide.

To add this image to your article, simply copy and paste the following line into the ideal spot in your article:

[[Image:Doubledovetailpuzzle3.png|thumb|description]]

## File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeUserDimensionsFile sizeComment
current

19:34, 3 December 2007

179×31831 KB[http://www.gutenberg.org/files/21531/21531-h/21531-h.htm ''Woodwork Joints''], public domain resource.

The following pages link to this file:

__________________
Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=\$=|O|=\$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
Guru

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2760
#13

### Re: How to Make Double Dovetail Joints

09/24/2009 10:06 PM

this is syperb..thank you very much...lovely links....i will get one made for my training classes.

__________________
Nothing worthwhile can ever be taught, it can only be learnt.
Guru

Join Date: Jun 2006
Location: Magnetic Island, Queensland, Australia
Posts: 3746
#14

### Re: How to Make Double Dovetail Joints

09/25/2009 12:10 AM

kvsridhar

i will get one made for my training classes.

Wouldn't it be better to make it your self and become a real trainer? I would, Ky.

__________________
The Twain Has Met
Guru

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2760
#15

### Re: How to Make Double Dovetail Joints

09/25/2009 12:20 AM

i agree 100%..but...alas .. at age 65, my carpentry skills, never very good, would not run to this level. However, this is India, an iges file to a CNC vendor would be easier and cheaper than even a skilled carpenter .. nowadays an endangered species here

__________________
Nothing worthwhile can ever be taught, it can only be learnt.
Guru

Join Date: Jun 2006
Location: Magnetic Island, Queensland, Australia
Posts: 3746
#16

### Re: How to Make Double Dovetail Joints

09/25/2009 12:43 AM

You have my respect kysrihar, no worries. I would have problems handling it never mind teaching others how to do it my self. I presumed your were a hands on guy. It would be a nice exercise with hand tools and a lot of time to do it though.

All the best, Ky.

__________________
The Twain Has Met
Guru

Join Date: Jun 2008
Location: USA/Europe
Posts: 4633
#17

### Re: How to Make Double Dovetail Joints

09/25/2009 6:36 AM

Hello kvsridhar,

I am pleased you found it useful. I pasted the whole page as the links looked good.

Take care.

__________________
Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=\$=|O|=\$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
Interested in this topic? By joining CR4 you can "subscribe" to