On 18-12-2018 8:49, Thomas de Groot wrote:
> On 18-12-2018 1:43, StephenS wrote:
>> On 2018-12-17 2:25 a.m., Thomas de Groot wrote:
>> ...
>>> An Aztec Calendar is what I would attempt.
>>>
>>
>> The calendar looks like two rings that slide on each other, or am I 
>> seeing it wrong? Gears in stone?
>>
> 
> I hate it when I am unable to find back what I am looking for :-/
> 
> If I remember well, it consists of three geared wheels, one involute. I 
> must have a picture somewhere as I intended years ago to make an 
> animation from it. I keep looking...
> 
> 

This is the sort of construction which I mean:

https://www.youtube.com/watch?v=BPbZNUd3Vy4
https://www.youtube.com/watch?v=qhWItvjk9Yg

-- 
Thomas

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