[OpenSCAD] Mayan calendar

Mark Peeters peetersmarkg at gmail.com
Fri Jan 5 11:51:40 EST 2018


That large gear is so big, I wonder if making the clock into "chains" would be easier to hang on the wall with a bin below to hold the long 365 link chain. The tiles for each day could be printed in two colors to help visibility too. 

I hope this image helps 


> On Jan 5, 2018, at 10:40 AM, Dan Shriver <tabbydan at gmail.com> wrote:
> 
> The third big gear (365) basically does what two gears should do.  It generates a month day (number), and a month name.  The problem is 18 months are 20 days long and the last one is only 5.  I have a concept for advancing month 19 to month 1 after day 5 passes.  Unfortunately,  my idea does not reset the month day wheel back to 1.
> 
> I was completely wrong when I earlier said the secular/ solar year was not subdivided.   If you look at the 3 gear animation you see that the 365 gear has a number (dot/ bars, base 20) then a month name.
> 
>> On Jan 5, 2018 10:30 AM, "Mark Peeters" <peetersmarkg at gmail.com> wrote:
>> I'm confused by the idea of 4 gears.
>> Looks like the dates are always just 3 characters. I think a 4 gear solution would be hard to read.
>> 
>> The huge gear is an issue to print, maybe something like the flip clock could take up less space to display the characters?
>> 
>>> On Wed, Jan 3, 2018 at 4:39 PM, Dan Shriver <tabbydan at gmail.com> wrote:
>>> That's a decent representation.  But they simplified the "secular year" (365 day part) to be one BIG ring/gear (to get around the problem of the odd month at the end).
>>> 
>>> I'm wondering if there is some way to do it as four gears.
>>> 
>>> If it was just a 260 day cycle (20 months of 13 days each) and a 360 day cycle (18 months of 20 days each) it would be relatively easy.
>>> 
>>> Something would simultaneously turn the 13 day ("sacred month") wheel 1/13 revolution and the 20 day ("secular month") wheel 1/20th revolution.  Each month day wheel would have one tooth between the first and last days of the month that tooth would cause the outer ring to rotate one spot (advancing the "month").  The two outer rings would not need teeth between them (this would reduce wear caused by things not being perfect in the real world and thus having the months maybe not being perfectly in synch).
>>> 
>>> The big problem is that the "secular year" has 365 days and thus 19 months with the last one being only 5 days.  If I call the last month Dec and the first one Jan... I have an imperfect workaround.  The 20 day month ring has 2 teeth.  One between 1 & 20 (big tooth) and one between 5 & 6 (small tooth).  The month name ring has a smaller inner radius for the last month so it catches at 5... The problem is that instead of starting over on Jan 1, the first day of the new year will read Jan 6, not sure how to correct that.
>>> 
>>> 	Virus-free. www.avast.com
>>> 
>>>> On Wed, Jan 3, 2018 at 3:10 PM, Mark Peeters <peetersmarkg at gmail.com> wrote:
>>>> I think this shows and describes the calendar cycles and how they go together.
>>>> https://youtu.be/BeE-3BBqG58
>>>> 
>>>>> On Jan 3, 2018, at 12:25 PM, Dan Shriver <tabbydan at gmail.com> wrote:
>>>>> 
>>>>> Looking at it again I guess it would be at least four gears because the "secular" 365 calendar is subdivided in an odd way.  18 months of 20 days each,  plus one special month at the end of just five days.
>>>>> 
>>>>> The Aztec sun stone is odd because it mixes various info together.  It has calendric info but is not a calendar, it has some royal history, and in the center a prediction about how the 5th" sun/ world"  would end.  The Aztecs believed they were living in the 5th world or sun, of a sequence of such worlds/ suns.
>>>>> 
>>>>> I am curious how that was generated since it could help me with the glyphs.
>>>>> 
>>>>>> On Jan 3, 2018 8:28 AM, "cbernhardt" <charlie at carols62.com> wrote:
>>>>>> I am not certain that this is the calendar you are referring to, but attached
>>>>>> is a picture of an Aztec calendar produced in OpenSCAD from an AutoCAD DXF
>>>>>> file.  I can send you the DXF file if it would help.
>>>>>> <http://forum.openscad.org/file/t1309/aztec.jpg>
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> --
>>>>>> Sent from: http://forum.openscad.org/
>>>>>> 
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