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 Post subject: Shift Happens by OSKAR & BRAM
PostPosted: Sat Jul 12, 2014 4:39 am 
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Hi Twisty Puzzles fans,

Shift Happens is a meshing-gear puzzle in the same vein as Pentafold and Gear Fold. Bram Cohen wanted a set of six gears with an unequal number of teeth. After some discussion, he proposed the numbers 10-20-16-12-18-15. The initial idea was to have the gears in a triangle, but the gear set would not mesh that way. The alternative was a hexagonal pattern. As Pentafold and Gear Fold are rather floppy due to their hinges, Shift Happens uses a shifting mechanism similar to Gear Shift, but flat instead of spatial.

Watch the YouTube video.
Buy the puzzle at my Shapeways Shop.
Read more at the Shapeways Forum.
Check out the photos below.

Enjoy!

Oskar
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Oskar's home page, YouTube, Shapeways Shop, Puzzlemaster, and fan club
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 Post subject: Re: Shift Happens by OSKAR & BRAM
PostPosted: Sat Jul 12, 2014 10:01 am 
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Joined: Sun Jan 02, 2011 6:48 pm
Location: Canada
Oh shift! Haha :D ,wonderfull Oskar great job!

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 Post subject: Re: Shift Happens by OSKAR & BRAM
PostPosted: Sat Jul 12, 2014 7:40 pm 
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Joined: Thu Dec 21, 2006 5:32 pm
Location: Bay Area, CA
Very nice sliding mechanism.

Dave

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LitwinPuzzles.com has info on my puzzles.


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 Post subject: Re: Shift Happens by OSKAR & BRAM
PostPosted: Sun Jul 13, 2014 2:07 am 
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Joined: Mon Aug 02, 2004 7:03 am
Location: Koblenz, Germany
Hi,
I just made up a new category of mechanisms: Separable Gears.
I wonder: Would solving this puzzle be any different if one could shift the gears in six different directions not just three.

BTW: The museum allows only for twenty images per entry. This time it was narrow. :roll:

Andreas


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 Post subject: Re: Shift Happens by OSKAR & BRAM
PostPosted: Sun Jul 13, 2014 6:00 am 
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Andreas Nortmann wrote:
I wonder: Would solving this puzzle be any different if one could shift the gears in six different directions not just three.
It would make the puzzle much easier, defying Bram's original purpose of this puzzle.

Oskar

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 Post subject: Re: Shift Happens by OSKAR & BRAM
PostPosted: Sun Jul 13, 2014 7:05 pm 
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Joined: Sat Mar 22, 2003 9:11 am
Location: Marin, CA
It's surprisingly hard to design interesting examples of puzzles like this. They tend to be either underconstrained, where they let you solve them, or overconstrained, where they tell you how to solve them. (Underconstrained generally means too few gears for the amount of motion, overconstrained too much.) Gear Shift just happens to be reasonably difficult. Skewb Shift happens to have one little trick to it. Rubik's Clock doesn't quite manage to be interesting.

The basic trick to this mechanism was designed for a different puzzle which hasn't been posted about yet.


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 Post subject: Re: Shift Happens by OSKAR & BRAM
PostPosted: Sun Jul 13, 2014 7:08 pm 
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Joined: Sat Mar 22, 2003 9:11 am
Location: Marin, CA
How many teeth does the incomplete non-functional gear in the middle have?


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 Post subject: Re: Shift Happens by OSKAR & BRAM
PostPosted: Mon Jul 14, 2014 1:31 am 
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Bram wrote:
How many teeth does the incomplete non-functional gear in the middle have?
15.68 teeth. Indeed, that is a non-integer number. Also that middle gear has been slightly fudged. Finally, the centers of the six yellow gears are almost but not exactly on a circle. Again some fudging was needed to make the teeth mesh.

Oskar

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 Post subject: Re: Shift Happens by OSKAR & BRAM
PostPosted: Tue Jul 15, 2014 5:09 am 
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Joined: Tue Dec 28, 2010 10:26 am
Very Nice!
I'd love to have a chance to play with some of this series of puzzles, they look like a lot of fun!

Also, Wow! Lots of mechanism pictures! I hope this is the start of a new trend!

And I love the name! :lol:


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