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"Preposterous " Puzzle

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Project by KnotCurser posted 12-23-2011 07:04 PM 3307 views 30 times favorited 17 comments Add to Favorites Watch

This was both a challenge and an order from a friend.

The challenge was to see if I could duplicate a picture of this puzzle he found. He would order it if I was able to. ;-)

It did take quite a while to get the exact dimensions of all the pieces correct, but as you can see I think I was successful.

BTW, this IS the same frame and the same pieces.

Pic 1 shows the pieces in one configuration along with a “leftover” piece to the right.

Pic 2 shows the pieces in a different configuration, now allowing the extra piece to fit!

While you math majors figure this one out, I am still kind of amazed that this works – even though I know its “secret”.

Woods used are Walnut, Ash and Cherry for main pieces. Australian Cypress for the “extra” piece & Spanish Cedar for the frame. Finish is a quick soak in lemon oil.

Enjoy!

-bob

-- Robert Rhoades WoodWorks / Email: rrww@rhoadesclan.com / www.rhoadesclan.com





17 comments so far

View Sheila Landry (scrollgirl)'s profile

Sheila Landry (scrollgirl)

7659 posts in 1574 days


#1 posted 12-23-2011 07:31 PM

Hi, Bob! You always put the most interesting challenges here. You sure keep us thinking! Another great piece of work from you. Since the mathematical part of my brain went on holiday, I will be anxiously watching to see what others here say. Thanks again for sharing another challenge.

Sheila :)

-- Designer/Artist/Teacher. Owner of Sheila Landry Designs (http://www.sheilalandrydesigns.com) Scroll saw, wood working and painting patterns and surfaces. "Knowledge is Power"

View BritBoxmaker's profile

BritBoxmaker

4369 posts in 1690 days


#2 posted 12-23-2011 07:44 PM

I’m not sure but I think the secret lies in the exact shape of the triangle. Nice puzzler. I won’t be happy until I’m sure about it.

-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com

View Gerben's profile

Gerben

102 posts in 1010 days


#3 posted 12-23-2011 07:56 PM

Your saw work is a bit sloppy. The sides don’t look very strait :-P

View Tokolosi's profile

Tokolosi

667 posts in 1009 days


#4 posted 12-23-2011 07:57 PM

Ok you will appreciate this Im sure. I work with 2 engineers. I have them all in the office next door trying to figure it out. They even made cut-outs with graph paper. The only thing they have agreed upon so far is that its impossible.

Update:

With the help of a CAD program they solved it. Simple yet elegant. Thanks for the fun your project provided us.

-- “There is nothing like looking, if you want to find something. You certainly usually find something, if you look, but it is not always quite the something you were after.” ~ JRR Tolkien

View redryder's profile

redryder

2158 posts in 1756 days


#5 posted 12-23-2011 09:00 PM

This is a great looking puzzle…...........

-- mike...............

View SPalm's profile (online now)

SPalm

4811 posts in 2536 days


#6 posted 12-23-2011 09:03 PM

Nice.
But I don’t like being fooled. And this is bothering me.
The triangle is curved? Arrrgh.

Steve

-- -- I'm no rocket surgeon

View KnotCurser's profile

KnotCurser

1835 posts in 1723 days


#7 posted 12-23-2011 09:08 PM

Sorry everyone, but all the lines are straight and none of the pieces are curved.

I have a video that explains this, but I think I will wait a few more hours to post it. ;-)

-bob

-- Robert Rhoades WoodWorks / Email: rrww@rhoadesclan.com / www.rhoadesclan.com

View degoose's profile

degoose

7012 posts in 2009 days


#8 posted 12-23-2011 09:37 PM

Top job mate. And although I have see this before it is still puzzling… will wait for the video…

-- Drink twice... and don't bother to cut... @ lazylarrywoodworks.com.au For lovers of all things timber...

View Pimzedd's profile

Pimzedd

450 posts in 2458 days


#9 posted 12-23-2011 10:15 PM

Hope you will post the CAD drawing as well. Very intriguing.

-- Bill - Mesquite, TX --- "Everything with a power cord eventually winds up in the trash.” John Sarge , timber framer and blacksmith instructor at Tillers International school

View KnotCurser's profile

KnotCurser

1835 posts in 1723 days


#10 posted 12-23-2011 11:06 PM

Okay, it’s about time I spill the beans…...........

Like I said, all angles are straight and there is no curved pieces.

What you do NOT see in the first picture, because of the camera angle, is a VERY thin gap across the entire top of the puzzle – it is exactly 1/7 the height of the extra block.

Watch this video for the entire explanation – he explains it much better than I can. :-)

http://www.youtube.com/watch?v=Rzzct1We-38

-bob

-- Robert Rhoades WoodWorks / Email: rrww@rhoadesclan.com / www.rhoadesclan.com

View clieb91's profile

clieb91

3276 posts in 2589 days


#11 posted 12-23-2011 11:38 PM

Great Puzzle, may have to add one of these to my to do list.

CtL

-- Chris L. "Don't Dream it, Be it."- PortablePastimes.com (Purveyors of Portable Fun and Fidgets)

View Gerben's profile

Gerben

102 posts in 1010 days


#12 posted 12-23-2011 11:43 PM

I thought it was an iteration of the triangle puzzle:

I guess you kind of fooled me too.
I like this one better, though.

View mondak's profile

mondak

61 posts in 1055 days


#13 posted 12-24-2011 04:03 PM

Gerben….......I made 1 of these 4pc traingle puzzles from 1/4” ply a few yrs ago. The parts were not “exactly” sized, but it worked. Either way, Bobs puzzle and this one are mind bogglers.

View Sheila Landry (scrollgirl)'s profile

Sheila Landry (scrollgirl)

7659 posts in 1574 days


#14 posted 12-24-2011 04:05 PM

Thanks Bob for the fun project! You always seem to get us thinking! I really enjoyed seeing this and stretching my brain a little bit.

Sheila :)

-- Designer/Artist/Teacher. Owner of Sheila Landry Designs (http://www.sheilalandrydesigns.com) Scroll saw, wood working and painting patterns and surfaces. "Knowledge is Power"

View KnotCurser's profile

KnotCurser

1835 posts in 1723 days


#15 posted 12-24-2011 06:32 PM

Wow – thanks to you all!

The customer liked it and it will make a great holiday gift from him to his son – that’s the reason we do this stuff! :-)

I also have plans to make another puzzle that functions just like this one, but with totally different shapes – that will wait for a month or so since I am in the middle of a rather important project – details to be posted here later, of course.

Happy Holidays!

-bob

-- Robert Rhoades WoodWorks / Email: rrww@rhoadesclan.com / www.rhoadesclan.com

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