| Project by Junji | posted 193 days ago | 1512 views | 21 times favorited | 54 comments | ![]() |
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Here is an “easy to make” wooden puzzle, I made a while ago.
I found the idea from internet, and I thought it was interesting. I made a few and gave the most of them away to friends or son’s friend, but I am keeping this small one in my bag, so I can give a small quiz to anybody when there is not much to talk to the person.
Here is the video as you can see how it works (not solution, only giving you the better idea how it is made)
It takes only 30-60 minutes for one or maybe two. You can make it bigger or smaller like this, but looks good if you use nice looking hard wood, but you only need a small amount of wood anyway.
As for the solution, I think many of you guys can solve it very easily because you guys can think of it three-dimensionally. Once you shake it, it is locked, because the moving pins lock the other piece. So the holes must be a big bigger than the pins.
For those who could solve the quiz, please do not write the answer here. But to make it sure if you really got the right answer, you can make one of these and try what you thought. If you can take these 2 pieces apart 3 times in a row, that is the right answer.
For those who can’t find the answer, make one and try it whatever you think of. But be careful, once it’s locked, you can’t see the inside until it’s solved…
Have fun.
caution
Some people asked me how may pins are there.
There are 4 pins, 2 pins for each pieces. The pins are a bit shorter than the depth of holes where pins are in, and a bit longer than the width of the mortises, so the pins won’t get fall off.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/































54 comments so far
a1Jim
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16684 posts in 470 days
posted 193 days ago
Tricky stuff
-- Jim from Heirloom Woodshop Southern Oregon
DaveR
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1517 posts in 613 days
posted 193 days ago
I love it! I think I know how to get it apart without even making one but I might make one anyway. Thanks for the idea.
-- Until you spread your wings, you'll have no idea how far you can walk.
scott shangraw
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408 posts in 962 days
posted 193 days ago
Pretty cool !!!
-- Scott NM,http://www.shangrilawoodworks.com
Junji
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507 posts in 275 days
posted 193 days ago
Jim,
Tricky but it’s simple, including the solution
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Junji
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507 posts in 275 days
posted 193 days ago
DaveR,
Yes, That’s what I first saw this on the net before, but you will be happy when you actually make it and make them apart anyway. Good luck.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
TopamaxSurvivor
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3014 posts in 569 days
posted 193 days ago
Thanks for posting this puzzle. Looks easy :-)) Now, to make one and try it??
-- Debt is nothing more than the 21st Century's form of slavery.
Junji
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507 posts in 275 days
posted 193 days ago
TopamaxSurvivor,
It is easy if you know how. Even my 6 year son can make them apart in 5 seconds.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
PurpLev
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2733 posts in 541 days
posted 193 days ago
awesome. thanks for the post. great little thing to make
-- When in doubt - There is no doubt - Go the safer route.
Junji
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507 posts in 275 days
posted 193 days ago
PurpLev,
Yes, this can be a small gift if you use a good piece of wood.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
TopamaxSurvivor
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3014 posts in 569 days
posted 193 days ago
I’m old, fat, slow and loosing my mind, so I should have it in 30 or less ;-)) When my 3 year old grandson turned on grandma’s computer and started his game, I figured I’d better learn how to do it too!!
-- Debt is nothing more than the 21st Century's form of slavery.
DAN
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6438 posts in 876 days
posted 193 days ago
Neat !!
-- work from your heart and your spirit will live forever
corncob
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15 posts in 222 days
posted 193 days ago
Great post. Saw this and had to run downstairs and make a couple. Better half is trying to get one apart now. Thanks Junji.
-- If at first you don't succeed it'll make some mighty fine kindling -- corncob --
Skarp
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176 posts in 219 days
posted 193 days ago
Nice puzzle! I also checked your profile and visited your myspace music page after seeing your thumbnail and thinking “He must play acoustic guitar”. Nice compositions, I enjoyed them. What brand of guitar do you play? Japan has some really great luthiers, I hope one day to visit and see true shokunin at work. I’d even like to try my hand at making some instruments of my own. How about you?
-- Ooo, er.
Junji
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507 posts in 275 days
posted 193 days ago
TopamaxSurvivor,
Yeah, little kids can learn anything so fast! My son knows much more how to use the TV controller.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Junji
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507 posts in 275 days
posted 193 days ago
corncob,
So you already made??? You better solve it soon or somebody else will show you how with what you made. I think that really makes you sad…
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Junji
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507 posts in 275 days
posted 193 days ago
Skarp,
Yes, I have 2 taylor’s guitar. One larrivee. So far I think guitar from US or Europe sounds better to be than Japanese ones. But I have not tried much individual luthiers, so when I have chances, I should try some. But once you try it, and if you like it… I have to pay for it, that’s what happens all the time…
Me making guitar? No right now I don’t think about it. I know what I want to play with, and I also know that I can’t make it myself. But if you ever try, I really wanna see how it goes, so please keep posted in your blog.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Gary
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576 posts in 326 days
posted 193 days ago
I gotta try this. If I can’t get it, I have 6 grandchildren who can help
-- Gary, DeKalb Texas
Skarp
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176 posts in 219 days
posted 193 days ago
Ah Taylor, good company. I have a Dean electric and a Manuel Rodriguez e Hijos classical. I have gone through so many guitars though. I like them for a while and then I wind up getting tired of the sound. Building one is a pretty big challenge and I don’t expect I could make a guitar first time better than what I have already. Still it would teach a lot of good woodworking lessons! Probably drive me crazy too :) I just have so many things to do before that. Oh yeah, how is that chair coming along? Looked almost done. Anyhow off to clean up the shop. Keep up the good work.
-- Ooo, er.
theRIAA
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6 posts in 193 days
posted 193 days ago
haha. I know how to solve it. I had something like this as a kid, except it was “get the balls in the holes” type.
I’m gonna go make one now.
Junji
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507 posts in 275 days
posted 193 days ago
Gary,
That’s one good way to solve the question. But better to know it first, because in that way, you can be little respected from your grandchildren…
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Junji
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507 posts in 275 days
posted 193 days ago
Skarp,
Yes, I know. If I can have just one GREAT sound guitar, that would be enough, but we never be satisfied…
And I agree with you about making guitar. It should teach me a lot of things, but also agree that it would make me crazy.
I am working on the chair and looks like I can finish it soon. Will write a blog soon.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Junji
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507 posts in 275 days
posted 193 days ago
theRIAA,
You knew it! “get the balls in the holes” type? Sounds good too, but I just can’t imagine how it looks like. Do you have a photo of it?
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
theRIAA
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6 posts in 193 days
posted 193 days ago
junji,
the puzzle i had didn’t “unlock” it just had a goal of getting a couple BBs in certain spots. The puzzle was round, i can imagine you know where those certain spots were…
mine is pretty shoddy, i couldn’t find the drill press, so the holes are ugly and everything is super loose… /:

I sanded the dowels in a drill with a Random orbit sander… way faster than w/o the drill and a lot better looking.
i want to put a box around this thing, so you have to oh crap I almost gave away the secret!
Mark Gipson
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63 posts in 273 days
posted 192 days ago
I just finished putting mine together from some parawood (rubber wood) scraps. I’m not sure I would have solved it yet without seeing it in pieces. I think if you buy this puzzle it comes already assembled and would be pretty tricky to solve. Thanks for posting this, I couldn’t do any of main current project today because of rain but I was able to make this inside the shop instead.
Junji
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507 posts in 275 days
posted 192 days ago
theRIAA,
Ah, maybe I know what you are talking about now. It’s round, so I think the way to solve is the same way, yes.
Hey, you already made one too! Looks good. Hey, don’t give them the secret!
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Junji
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507 posts in 275 days
posted 192 days ago
Mark,
You have made it too!!!
Now all you have to is think… The only way you can make them apart is to move all the 4 pins to place where they were when you put them together. Oh did I give you too much hint?
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
corncob
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15 posts in 222 days
posted 192 days ago
I too only realized the solution during construction. Like Luke, I needed to use ‘the force’.
-- If at first you don't succeed it'll make some mighty fine kindling -- corncob --
Junji
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507 posts in 275 days
posted 192 days ago
corncob
Ha ha! Yes, maybe that’s ‘the force’! Glad you solved it.
Congrats.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Gary
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576 posts in 326 days
posted 192 days ago
Junji, in the video it looks like there are 3 pins but you mentioned 4 pins. Does each part have 2 pins?
-- Gary, DeKalb Texas
TopamaxSurvivor
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3014 posts in 569 days
posted 192 days ago
No wonder I thought it was so easy :-)) I didn’t watch the video very close. I thought there were only 2 pins!!
-- Debt is nothing more than the 21st Century's form of slavery.
Junji
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507 posts in 275 days
posted 192 days ago
Gary,
Yes, there are 4 pins not 3. They are all same length, and little bit shorter than the depth of the holes. Sorry, my photos are bit confusing.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Gary
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576 posts in 326 days
posted 192 days ago
OK Top….30 minutes in the outhouse for you for cheating
-- Gary, DeKalb Texas
Junji
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507 posts in 275 days
posted 192 days ago
TopamaxSurvivor,
Same above, 4 pins. Not 2. So they can be pushed away in the holes, but once you shake it, they will touch each other at 2 points. Now gets more complicated?
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Karson
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25793 posts in 1293 days
posted 192 days ago
I believe I have the solution mastered. I guess I’ll need to make a few.
-- What happens in the workshop stays in the workshop. No wait that doesn't sound right. Karson Southern Delaware karson_morrison@bigfoot.com †
TopamaxSurvivor
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3014 posts in 569 days
posted 192 days ago
I can see where this could get to be a real pain to get them to separate again :-(( Two would be sooooo easy :-))
Well Gary, it’s my darned conscience, at least I fessed up :-))
-- Debt is nothing more than the 21st Century's form of slavery.
Junji
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507 posts in 275 days
posted 192 days ago
Gary,
Ha ha ha! Forgive him, he wasn’t cheating! Just make it 20.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Junji
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507 posts in 275 days
posted 192 days ago
Master Karson!
You mastered it, good. Now I let you to show it around, make others think you are smarter then them!
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Gary
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576 posts in 326 days
posted 192 days ago
Hey top, I’m trying to slide one over on you. I haven’t even made one yet. Power was out here all day due to a storm. I’ll try tomorrow. We may be in the outhouse together!!
-- Gary, DeKalb Texas
TopamaxSurvivor
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3014 posts in 569 days
posted 192 days ago
Toronado?? Gary. i had to work today. Maybe I’ll get one done tomorrow too ;-)
Wouldn’t a double puzzle be a kick in teh butt for those who think they can get it every time :-)) 8 dowels in 2 borings in both blocks !!!
-- Debt is nothing more than the 21st Century's form of slavery.
Gary
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576 posts in 326 days
posted 192 days ago
There was a tornado but, not here. It was 14 miles east. But, it cut my power. All I had was rain and wind. Since all this weather has started, I’ve had 10.3” of rain. I’ve ordered some marine ply and plans
-- Gary, DeKalb Texas
TopamaxSurvivor
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3014 posts in 569 days
posted 192 days ago
My sister at Marion, IL was out for 2 1/2 days. Lots of folks up there out for a week or more I think.
-- Debt is nothing more than the 21st Century's form of slavery.
Gary
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576 posts in 326 days
posted 192 days ago
WOW. They should have had a couple of Junji’s puzzles to kill the time!
-- Gary, DeKalb Texas
degoose
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1981 posts in 247 days
posted 192 days ago
Spin!
-- Drink once, cut twice. New website up.... lazylarrywoodworks.com.au
degoose
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1981 posts in 247 days
posted 192 days ago
?
-- Drink once, cut twice. New website up.... lazylarrywoodworks.com.au
degoose
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1981 posts in 247 days
posted 192 days ago
!
-- Drink once, cut twice. New website up.... lazylarrywoodworks.com.au
Junji
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507 posts in 275 days
posted 191 days ago
degoose,
Right.
Maybe you didn’t read what I wrote about the solution. If possible, can you remove the comment, so everybody can enjoy the puzzle?
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
degoose
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1981 posts in 247 days
posted 191 days ago
Sorry didn’t mean to spoil it and no can’t edit or remove my comment no time left.. only just read you request
-- Drink once, cut twice. New website up.... lazylarrywoodworks.com.au
Alan
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212 posts in 297 days
posted 191 days ago
Great puzzle. My kids will love it. Thanks
-- Alan, Prince George
Junji
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507 posts in 275 days
posted 191 days ago
degoose,
It’s OK, I knew that only 10 minutes left to edit your comment when I wrote my comment, but I wanted to try anyway.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
Junji
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507 posts in 275 days
posted 191 days ago
Alan,
Yes, my kids love it too.
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
abie
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112 posts in 664 days
posted 152 days ago
Thanks;
Just made mine and now will have to refine it so the holes don’t show.
My dowels need to be a little longer but it works and has impressed the folks at the wood shop here.
Bruce
-- Bruce
Junji
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507 posts in 275 days
posted 152 days ago
Bruce,
It’s so great hear that! Tell them it came all the way across the pacific ocean!
Junji
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/
rance
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4 posts in 53 days
posted 41 days ago
Junji,
I like projects like this Thanks for sharing this. I built one, then used it as a project for some scouts to build. They loved theirs.
Rance
Junji
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507 posts in 275 days
posted 41 days ago
rance,
It’s so nice to know that your scouts made ones of thier own and tried to solve the question.
Thanks for using this idea.
Junji
-- Junji Sugita from Japan, http://tetra.blog12.fc2.com/