Community Design Crit - April 10, Inclusive Combination Locks

Antranig Basman antranig.basman at
Tue Apr 10 09:35:20 UTC 2018

I wondered how it worked, and appears to be a form of "mechanical hash 
function" -

"The number of combinations is unlimited, but the number of 
mechanically-possible states is markedly finite: 7,501 to be exact. mh 
likens this to the mechanical version of a hash function. I can't think 
of a more concise allegory for it."

On 09/04/2018 16:51, Tony Atkins wrote:
> Hi, All:
> Very interesting topic.  I chatted with Jonathan about this, but wanted 
> to share with the group, I bought one of these a few years ago just 
> because I was so excited that something like it was available for a few 
> dollars at a non-specialty store:
> You enter a combination of motions along the cardinal points to unlock 
> it.  It's indexed so that you can only push along the cardinal 
> directions and there's a good "click" when you have pushed the stick far 
> enough.  All you need to feel is which way is up, which is pretty 
> obvious as the metal of the lock is always "up" and feels different than 
> the body.  I've unlocked it in the dark and one handed, it's a good design.
> Anyway,  sadly the timing never works out for me to attend the design 
> crits, but I hope to see the slides at least as I am really interested 
> in the topic.
> Cheers,
> Tony

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