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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...
--
Thomas
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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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On 2018-12-18 3:05 a.m., Thomas de Groot wrote:
...
> This is the sort of construction which I mean:
>
> https://www.youtube.com/watch?v=BPbZNUd3Vy4
> https://www.youtube.com/watch?v=qhWItvjk9Yg
>
I like the first one. I would need to make the pictures for it to have
meaning, not my best area for modeling.
Stephen S
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On 18/12/2018 11:02, StephenS wrote:
> On 2018-12-18 3:05 a.m., Thomas de Groot wrote:
> ....
>> This is the sort of construction which I mean:
>>
>> https://www.youtube.com/watch?v=BPbZNUd3Vy4
>> https://www.youtube.com/watch?v=qhWItvjk9Yg
>>
>
> I like the first one.
It looks perfect for what you have done.
> I would need to make the pictures for it to have meaning, not my best area for
modeling.
>
Plagiarize, let no one's work evade your eyes
https://maya.nmai.si.edu/calendar/reading-calendar-glyphs
https://maya.nmai.si.edu/sites/all/themes/mayatime/img/glyph-interactive/glyphs/overlay/b5.jpg
--
Regards
Stephen
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Le 18/12/2018 à 03:08, StephenS a écrit :
> On 2018-12-17 7:40 p.m., StephenS wrote:
> ...
>> I think I should start with something easier, planetary gears
>> (epicyclic gears). Then work my way up to something with more parts.
> ...30 tooth inside
> 4 x 10 tooth outside
>
> Comments Welcome:
>
> Stephen S
Margins are missing.
The head of tooth should not touch the foot of the opposite gear.
The part of teeth which get in contact should follow Euler's work, the
remaining part is irrelevant as long as it does not block the movement.
For less noise, consider a slanted rolling profil along depth (missing
the english word for that), and possibly a mirrored construction like
Citroën.
contact between any two gears should be limited to one pair of teeths,
one tooth per gear. (make teeth smaller).
Spur gear NEED a holding axis artefact.
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Le 18-12-18 à 12:03, Le_Forgeron a écrit :
> Le 18/12/2018 à 03:08, StephenS a écrit :
>> On 2018-12-17 7:40 p.m., StephenS wrote:
>> ...
>>> I think I should start with something easier, planetary gears
>>> (epicyclic gears). Then work my way up to something with more parts.
>> ...30 tooth inside
>> 4 x 10 tooth outside
>>
>> Comments Welcome:
>>
>> Stephen S
>
> Margins are missing.
>
> The head of tooth should not touch the foot of the opposite gear.
>
> The part of teeth which get in contact should follow Euler's work, the
> remaining part is irrelevant as long as it does not block the movement.
>
> For less noise, consider a slanted rolling profil along depth (missing
> the english word for that), and possibly a mirrored construction like
> Citroën.
>
> contact between any two gears should be limited to one pair of teeths,
> one tooth per gear. (make teeth smaller).
>
> Spur gear NEED a holding axis artefact.
>
Slanted in one direction : Helical
Double slant à la Citroën : Chevron
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On 18/12/2018 17:03, Le_Forgeron wrote:
> Le 18/12/2018 à 03:08, StephenS a écrit :
>> On 2018-12-17 7:40 p.m., StephenS wrote:
>> ...
>>> I think I should start with something easier, planetary gears
>>> (epicyclic gears). Then work my way up to something with more parts.
>> ...30 tooth inside
>> 4 x 10 tooth outside
>>
>> Comments Welcome:
>>
>> Stephen S
>
> Margins are missing.
>
> The head of tooth should not touch the foot of the opposite gear.
>
> The part of teeth which get in contact should follow Euler's work, the
> remaining part is irrelevant as long as it does not block the movement.
>
> For less noise, consider a slanted rolling profil along depth (missing
> the english word for that), and possibly a mirrored construction like
> Citroën.
>
> contact between any two gears should be limited to one pair of teeths,
> one tooth per gear. (make teeth smaller).
>
> Spur gear NEED a holding axis artefact.
>
You are right in what you say and the Blacksmith should know. :)
A couple of years ago I was building gear drives in Blender. There is a
lot of theory behind designing the gears. Also the default values on the
page Stephen posted. Gave a result that fitted where they touched. :)
Thinking of the Tri_top Stephen cut and that he has access to a CNC
plasma cutter. I assume the ring gear was a test cut and the gears just
fit together for display.
I think that the sheet metal is too thin to put a slant on it.
But what do I know. I once had a plater pull a hacksaw from my hands. As
he could not stand to watch the way I used it. Yip! I cut on the backstroke.
--
Regards
Stephen
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On 2018-12-19 12:34 p.m., Stephen wrote:
> ... There is a
> lot of theory behind designing the gears.
...More coal, full steam ahead, blast the "theory". We'll make it fit
with a bigger hammer :-)
Stephen S
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On 19/12/2018 23:39, StephenS wrote:
> On 2018-12-19 12:34 p.m., Stephen wrote:
>
>> ... There is a lot of theory behind designing the gears.
> ....More coal, full steam ahead, blast the "theory". We'll make it fit
> with a bigger hammer :-)
>
If it works for you. It works for me.
I’m quite envious of your access to any CNC Machine. I reckon that if
you chrome plated your Triceratops. You could sell it for thousands.
I’ll only take 5% for the idea. ;)
Okay you talked me down to 2.5%. Hand crafted by an artisan, must surely
sell. :)
If I had any money I would ask you to build me one.
--
Regards
Stephen
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hi,
Stephen <mca### [at] aol com> wrote:
> ...
> I’m quite envious of your access to any CNC Machine. I reckon that if
> you chrome plated your Triceratops. You could sell it for thousands.
> ...
> If I had any money I would ask you to build me one.
so agree, it'd be natty.
StephenS:
looking at "gear_pic_.png" (18 Dec 2018 00:40:38), if you'd bend the rails to
half-circles, I can see a bear trap in the making. :-)
regards, jr.
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