Thomas de Groot <tho### [at] degrootorg> wrote:
> Op 16/03/2024 om 02:35 schreef Ton:
> > And another one:
> >
> Musing: It must be great fun to drive such an engine! Especially
> compared to modern cars...
>
> --
> Thomas

It will be hard work. You have to keep the fire going, the brake is a leather
belt! Steering is with a chain around the front axle, no springs, and it is
slow.
Have you ever seen Fred Dibnah on his traction engine?

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Op 16-3-2024 om 08:36 schreef Ton:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> Op 16/03/2024 om 02:35 schreef Ton:
>>> And another one:
>>>
>> Musing: It must be great fun to drive such an engine! Especially
>> compared to modern cars...
>>
>> --
>> Thomas
> 
> It will be hard work. You have to keep the fire going, the brake is a leather
> belt! Steering is with a chain around the front axle, no springs, and it is
> slow.
> Have you ever seen Fred Dibnah on his traction engine?
> 
Oh yes! I am aware of the difficulties and I remember Fred Dibnah 
indeed. However, that is all the (boy scout) fun, and you get an idea 
about how things work and are controlled (or not). Modern cars are 
convenient and comfortable, but they have become too complex to be 
understood by us, simple mortals. My 2CV was the last car I thought I 
understood and could repair myself (to a certain degree); but that is 
something from far back in the 20th century already and is a completely 
different story...

-- 
Thomas

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"Ton" <ton### [at] gmailcom> wrote:
> I couldn't find a Povray equivalent, so I
> want to create a Bolt macro, and a Nut macro. I found already that f_helix2()
> creates a good looking thread. Then throw a selectable head on top and done!


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

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"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Ton" <ton### [at] gmailcom> wrote:
> > I couldn't find a Povray equivalent, so I
> > want to create a Bolt macro, and a Nut macro. I found already that f_helix2()
> > creates a good looking thread. Then throw a selectable head on top and done!
>
>
>
https://news.povray.org/povray.general/thread/%3C875zph8073.fsf%40munyer.com%3E/?ttop=437822&toff=200

That looks a lot like what I have already. I use f_helix2(). Being a former
software engineers I take your comments seriously about "magic", hard-coded
numbers, so I'll avoid them. Make the code as clear as possible!
Here is a sneak preview:

Cheers
Ton.

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Attachments:
Download 'nutsboltstest.png' (182 KB)

Preview of image 'nutsboltstest.png'

"Ton" <ton### [at] gmailcom> wrote:

> That looks a lot like what I have already.

Likely.  I just remembered that short thread and figured I'd mention it, if it
would help any.

> I use f_helix2(). Being a former
> software engineers I take your comments seriously about "magic", hard-coded
> numbers, so I'll avoid them. Make the code as clear as possible!

Yeah, I've suffered from not being able to easily understand my own code due to
doing that sort of thing all to often.

> Here is a sneak preview:

That looks great.  :)
If you watch machining channels like Inheritence Machining, Clickspring, or This
Old Tony, most shop-made threads are cut with dies or single-point threading
tools on a lathe.

Mass-produced threads are rolled, which interestingly enough yields better
threads since they are work-hardened.

I guess where I was going with that, is that all of those operations leave tool
marks and patterns on the surface of the metal, and you could probably make some
really nice renders of just a pile of screws if you added a radial normal
perturbation or something like that to the threads.

What you have now would probably make a good threading on nylon or Delrin type
material.

- BW

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"Ton" <ton### [at] gmailcom> wrote:
> Hello again,
>
> after ten months I've finished my Allchin traction engine model. The used
> drawings are by Julius de Waal
> (https://www.modelengineeringwebsite.com/Allchin_1_4_scale.html). The details of
> these drawings are quite good (it's 27 sheets after all!). It was fun doing
> this, figuring out how to SDL all the parts.
>
> Cheers
> Ton.

Wow, that is attention to detail. Amazing modelling, do you have plans to put
this into a scene or just the challenge of creating the model is enough?

Sean

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hi,

"Ton" <ton### [at] gmailcom> wrote:
> "Bald Eagle" <cre### [at] netscapenet> wrote:
> > "Ton" <ton### [at] gmailcom> wrote:
> > > I couldn't find a Povray equivalent, so I ...

Mike Miller posted code last year.

<https://news.povray.org/povray.binaries.images/thread/%3Cweb.6446dab9a70a9db41f9dae3025979125%40news.povray.org%3E/>


regards, jr.

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> Wow, that is attention to detail. Amazing modelling, do you have plans to put
> this into a scene or just the challenge of creating the model is enough?
>
> Sean

I'll leave it as it is, Ten months is long enough.
The model is inside a museum, so people can admire it.

About my nuts and bolts, it is not my intention to make a close-up render of
them. I want to use them in machines and other stuff that's bolted together. I
probably don't need too much detail.

Cheers
Ton.

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Hi(gh)!

On 16.03.24 09:11, Thomas de Groot wrote:

> Oh yes! I am aware of the difficulties and I remember Fred Dibnah 
> indeed. However, that is all the (boy scout) fun, and you get an idea 
> about how things work and are controlled (or not). Modern cars are 
> convenient and comfortable, but they have become too complex to be 
> understood by us, simple mortals. 

The same goes for computers: just compare a Commodore 64 to any 
desktop/laptop/tablet/smartphone of 2024...

> My 2CV was the last car I thought I 
> understood

The perfect choice for travelling the Hippie Trail! The only 
Afghanistan-worthy compact car ever built!

See you in Khyberspace!

Yadgar

-- 
VBI BENE, IBI BACTRIA!

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