Totally frivolous and nothing to do with NBTV

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Re: Totally frivolous and nothing to do with NBTV

Postby Steve Anderson » Tue Oct 26, 2021 11:44 am

Yes, generally that's true. However you have to take into account our weather here. We're now coming to the end of our 'wet season', the humidity here has not been below 90% for six months except for the odd day, often it's 97% or more with the dew point and temperature separated by less than one degree. Stainless steel corrodes here, though slowly, but corrode it does. Add in the effects of temperature, rarely below 30C, and they all conspire to produce ideal conditions for corrosion.

I also have a reed switch on my bicycle for logging speed/distance etc., never a problem at similar voltages/currents. The version I used is filled with Nitrogen which presumably helps. But I thought all were filled with some gas or another, nitrogen, carbon dioxide, etc., or perhaps even a vacuum.

Steve A.
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Re: Totally frivolous and nothing to do with NBTV

Postby Klaas Robers » Tue Oct 26, 2021 7:10 pm

Steve, there are two kinds of stainless steel. One corrodes, the other (more expensive) does not corrode. My neighbour worked as a commercial man at a company that sells metal sheet, tubes, profiles and so on. He knows everything about metals and he told me about the two kinds of stainless steel. The bad one starts to corrode if you get it into contact with Clorine, the better one doesn't. It depends on the amount of chromium and nickel in the alloy.

About the tempertures and humidity, I know, I have been several times in Singapore to give classes. Mean temperature = 30 degrees, if it is 28 degrees it is feeled as cold, if it is 32 deg. it is hot. And the humidity is about 90%. I experienced the afternoon rains there, so severe, that I could not see the other side of the street.
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Re: Totally frivolous and nothing to do with NBTV

Postby Steve Anderson » Wed Oct 27, 2021 2:40 pm

Klaas Robers wrote:Mean temperature = 30 degrees, if it is 28 degrees it is feeled as cold....

Same here mostly. If it cools off to say 25C I start shivering and have to put warmer clothes on. The last time I was in the UK/Europe was 2017. It was about 17C and people were laughing that I was wearing a big wooly sweater...while they were just in T-shirts...it's what you get used to. Having been in S.E. Asia since 1989 I've adapted...

Here's an unused battery holder that's been sat on a shelf for 2-3 years (hence the dust), that's corrosion simply from the atmosphere...though I suspect that's cheap spring steel, not stainless...

Steve A.

Corroded Battery Holder 1.jpg
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Re: Totally frivolous and nothing to do with NBTV

Postby Steve Anderson » Thu Nov 11, 2021 4:29 pm

I'm still occasionally working on this useless exercise, I'll start on the hardware build early next week, it's quite simple. I've been mainly concentrating on the coding which determines how fast this will process numbers, especially as they get large...

...I guess I should really be working on something more useful, now let me see...

Steve A.

As a postscript, for quite some time I've been looking into doing some reasonably useful (I hope) YouTube videos. all based on what I have done and will do on this forum. I'll need to get a reasonable video camera, though many use their phones, audio isn't a problem, then there's piecing it all together (editing). That's quite a challenge...updates as and when as it might help or inspire others to do the same...
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Re: Totally frivolous and nothing to do with NBTV

Postby Steve Anderson » Sat Nov 13, 2021 2:47 pm

Well, I've decided to put this Collatz Conjecture 'thing' to bed, as novel as it may be, along with others, it's all been done before...and I'm most unlikely to be the one who finds any resolution to it...but if anyone else wants to have a go...

So I've decided to resume work on a more useful NBTV/SSTV project I started not that long ago.

However, to some degree there are constraints imposed by the current chip-shortage situation, but I guess there are work-arounds for those.

Steve A.
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