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From: Stephen
Subject: Re: Involute spur gear
Date: 18 Dec 2018 07:40:56
Message: <5c18ead8$1@news.povray.org>
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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From: Le Forgeron
Subject: Re: Involute spur gear
Date: 18 Dec 2018 12:03:04
Message: <5c192848$1@news.povray.org>
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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From: Alain
Subject: Re: Involute spur gear
Date: 19 Dec 2018 11:30:22
Message: <5c1a721e@news.povray.org>
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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From: Stephen
Subject: Re: Involute spur gear
Date: 19 Dec 2018 12:34:47
Message: <5c1a8137$1@news.povray.org>
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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From: StephenS
Subject: Re: Involute spur gear
Date: 19 Dec 2018 18:39:25
Message: <5c1ad6ad$1@news.povray.org>
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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From: Stephen
Subject: Re: Involute spur gear
Date: 20 Dec 2018 03:43:25
Message: <5c1b562d@news.povray.org>
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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From: jr
Subject: Re: Involute spur gear
Date: 20 Dec 2018 16:45:01
Message: <web.5c1c0c56540b848f48892b50@news.povray.org>
hi,

Stephen <mca### [at] aolcom> 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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From: StephenS
Subject: Re: Involute spur gear
Date: 24 Dec 2018 10:25:25
Message: <5c20fa65@news.povray.org>
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.
> 
...


I have about 30 pieces now, half modeled. The gears came out rough and 
often catch, more filing needed.

Comments welcome:

Stephen S


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Attachments:
Download 'gear_test0000.png' (56 KB) Download 'gear_test0001.png' (55 KB) Download 'gear_test0002.png' (56 KB) Download 'gear_test0003.png' (56 KB) Download 'planetary_test.png' (521 KB)

Preview of image 'gear_test0000.png'
gear_test0000.png

Preview of image 'gear_test0001.png'
gear_test0001.png

Preview of image 'gear_test0002.png'
gear_test0002.png

Preview of image 'gear_test0003.png'
gear_test0003.png

Preview of image 'planetary_test.png'
planetary_test.png


 

From: Bald Eagle
Subject: Re: Involute spur gear
Date: 24 Dec 2018 13:55:00
Message: <web.5c212b1b540b848f765e06870@news.povray.org>
StephenS <nom### [at] nomailcom> wrote:

> I have about 30 pieces now, half modeled. The gears came out rough and
> often catch, more filing needed.
>
> Comments welcome:

Nice!  :)

Have you thought about motor-driving them and lapping them with abrasive to
automate the smoothing?

They also use a grease with particulate copper in it for Glocks and other such
items - perhaps a quick electroplating or just dumping the iron parts into a
copper sulfate solution (bluestone) to do a non-galvanic plating via a surface
redox reaction would give you slightly copper-plated gears which might run more
smoothly...   or not.  ;)


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From: Stephen
Subject: Re: Involute spur gear
Date: 24 Dec 2018 14:33:19
Message: <5c21347f$1@news.povray.org>
On 24/12/2018 18:53, Bald Eagle wrote:
> StephenS <nom### [at] nomailcom> wrote:
> 
>> I have about 30 pieces now, half modeled. The gears came out rough and
>> often catch, more filing needed.
>>
>> Comments welcome:
> 
> Nice!  :)
> 
> Have you thought about motor-driving them and lapping them with abrasive to
> automate the smoothing?
> 

I was going to say that as a joke.

> 
> Just put some grinding paste on it and run it until it stops squeeling. ;)
> 
> 



> They also use a grease with particulate copper in it for Glocks and other such
> items - perhaps a quick electroplating or just dumping the iron parts into a
> copper sulfate solution (bluestone)

Copper sulfate crystals. Ah!

> to do a non-galvanic plating via a surface
> redox reaction would give you slightly copper-plated gears which might run more
> smoothly...   or not.  ;)
> 

Or you could varnish areas beforehand and have an image as an effect.




-- 

Regards
     Stephen


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