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23 Jun 2024 09:35:25 EDT (-0400)
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From: Bald Eagle
Subject: Re: screws.png
Date: 24 Apr 2023 14:35:00
Message: <web.6446cb6ca70a9db41f9dae3025979125@news.povray.org>
Alain Martel <kua### [at] videotronca> wrote:

> > Rendering of screws. Just posted the scene and macro's for generating a few
> > screw/bolt types. Working in a distressed steel material. Like flies, theses
> > will start showing up in my renderings. :)
> > Mike.
>
> You forgot the Robertson head.
> It's square, slightly wider at the top by about 2% to 3%.

Clearly he didn't have one on hand when he took that photograph that he's trying
to pass off as a render....


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From: Bald Eagle
Subject: Re: screws.png
Date: 24 Apr 2023 15:40:00
Message: <web.6446dab9a70a9db41f9dae3025979125@news.povray.org>
"Mike Miller" <mil### [at] gmailcom> wrote:
> Rendering of screws. Just posted the scene and macro's for generating a few
> screw/bolt types. Working in a distressed steel material. Like flies, theses
> will start showing up in my renderings. :)
> Mike.

I'm sure the threads must be a real challenge to get right.

We had a guy work out a bunch of the math for getting the right thread profile,
a while back.
I'm sure there are other macros for generating screw threads - It's something
I'm certain could be expanded into a field of its own.  Just paging through
Machinery's Handbook, it's an extensive topic.

https://news.povray.org/povray.general/thread/%3C875zph8073.fsf%40munyer.com%3E/?ttop=437822&toff=200

- BW


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From: Kenneth
Subject: Re: screws.png
Date: 24 Apr 2023 17:40:00
Message: <web.6446f62ca70a9db49b4924336e066e29@news.povray.org>
Beautiful! Gorgeous! Photo-real!

I'm running out of superlatives. Wow!

Thanks for posting the code too; I can't wait to dig into it.


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From: Mike Miller
Subject: Re: screws.png
Date: 24 Apr 2023 17:45:00
Message: <web.6446f7d7a70a9db459197626dabc9342@news.povray.org>
"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Mike Miller" <mil### [at] gmailcom> wrote:
> > Rendering of screws. Just posted the scene and macro's for generating a few
> > screw/bolt types. Working in a distressed steel material. Like flies, theses
> > will start showing up in my renderings. :)
> > Mike.
>
> I'm sure the threads must be a real challenge to get right.
>
> We had a guy work out a bunch of the math for getting the right thread profile,
> a while back.
> I'm sure there are other macros for generating screw threads - It's something
> I'm certain could be expanded into a field of its own.  Just paging through
> Machinery's Handbook, it's an extensive topic.
>
>
https://news.povray.org/povray.general/thread/%3C875zph8073.fsf%40munyer.com%3E/?ttop=437822&toff=200
>
> - BW

I kinda cheated with the treads. I use a macro for a cubic spine coil that's
driven by bolt length and radius - I use it to boolean cut the bolt. There's
probably a better way. Thanks for the info.
Mike.

 .


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From: Kenneth
Subject: Re: screws.png
Date: 24 Apr 2023 18:10:00
Message: <web.6446fdd1a70a9db49b4924336e066e29@news.povray.org>
"Kenneth" <kdw### [at] gmailcom> wrote:
>
> Thanks for posting the code too; I can't wait to dig into it.
>

...and the image and code appropriately show up in the newsgroups'
      "Thread Digest (100 newest threads in all groups)"

:-D

Hey, wait a minute...I count only six screw threads!! Where are the other 94??
What the...??

[My little April Fools joke. Late by 3 weeks.]


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From: Cousin Ricky
Subject: Re: screws.png
Date: 24 Apr 2023 19:56:15
Message: <6447171f$1@news.povray.org>
On 2023-04-24 15:38 (-4), Bald Eagle wrote:
> 
> We had a guy work out a bunch of the math for getting the right thread profile,
> a while back.
> I'm sure there are other macros for generating screw threads - It's something
> I'm certain could be expanded into a field of its own.  Just paging through
> Machinery's Handbook, it's an extensive topic.
> 
>
https://news.povray.org/povray.general/thread/%3C875zph8073.fsf%40munyer.com%3E/?ttop=437822&toff=200

I created isosurface functions for machine screw threads that take the
major diameter and thread count as parameters.  The functions are more
turnkey than Robert Munyer's code, and give the same results.

https://news.povray.org/5eec257c%241%40news.povray.org

Beware, there is an illegitimate apostrophe in my post.  I didn't notice
it until too late.


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From: Bald Eagle
Subject: Re: screws.png
Date: 24 Apr 2023 21:30:00
Message: <web.64472d10a70a9db41f9dae3025979125@news.povray.org>
Cousin Ricky <ric### [at] yahoocom> wrote:

> I created isosurface functions for machine screw threads that take the
> major diameter and thread count as parameters.

That first function works very nicely.  The rest will have to wait until later.

With jr's tabulated macro, these would make very nice standard thread charts.

POV-Machinery, Inc.

> Beware, there is an illegitimate apostrophe in my post.  I didn't notice
> it until too late.

Neither did the question mark and the exclamation point...   :D



Well done, as usual.

- BW


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Attachments:
Download 'screwthreads.png' (256 KB)

Preview of image 'screwthreads.png'
screwthreads.png


 

From: Alain Martel
Subject: Re: screws.png
Date: 25 Apr 2023 12:46:47
Message: <644803f7$1@news.povray.org>
Le 2023-04-24 à 14:33, Bald Eagle a écrit :
> Alain Martel <kua### [at] videotronca> wrote:
>> Le 2023-04-23 à 18:15, Mike Miller a écrit :
>>> Rendering of screws. Just posted the scene and macro's for generating a few
>>> screw/bolt types. Working in a distressed steel material. Like flies, theses
>>> will start showing up in my renderings. :)
>>> Mike.
>>
>> You forgot the Robertson head.
>> It's square, slightly wider at the top by about 2% to 3%.
> 
> Clearly he didn't have one on hand when he took that photograph that he's trying
> to pass off as a render....
> 
> 
> 
🤣


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From: Bald Eagle
Subject: Re: screws.png
Date: 25 Apr 2023 16:45:00
Message: <web.64483b7da70a9db41f9dae3025979125@news.povray.org>
Second "square" function.

Added a bit of normal.
Thought maybe since it was an isosurface, and so somewhat like a signed distance
fucntion, that maybe changing the threshold value would round them a bit, but it
just made the threads fatter.

Of course, that could possibly lend itself to a thread-cutting animation...


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Attachments:
Download 'squarethreads.png' (95 KB)

Preview of image 'squarethreads.png'
squarethreads.png


 

From: Mike Miller
Subject: Re: screws.png
Date: 26 Apr 2023 00:05:00
Message: <web.6448a1fba70a9db459197626dabc9342@news.povray.org>
"Bald Eagle" <cre### [at] netscapenet> wrote:
> Second "square" function.
>
> Added a bit of normal.
> Thought maybe since it was an isosurface, and so somewhat like a signed distance
> fucntion, that maybe changing the threshold value would round them a bit, but it
> just made the threads fatter.
>
> Of course, that could possibly lend itself to a thread-cutting animation...

Wow... that looks amazing. Very nice....mine looks stupid in comparison. :>0
Mike
note to self...look at iso surfaces. :)


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