This photo was found on my HD, I can't give any credit, sorry.
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@n_dimension @GustavinoBevilacqua Some of them do look usable.
The tapered screw is just an NPT thread with a more aggressive angle for example
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@GustavinoBevilacqua Brilliant! I have a paper diagram that contains all these gems, but have never seen a physical version before.
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@Nel @GustavinoBevilacqua
i use to order them from etel tuning.
https://etel-tuning.eu/kategorie/heimwerkerbedarf/sonderschrauben/ -
@GustavinoBevilacqua this feels very https://etel-tuning.eu/ (sadly only german)
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@GustavinoBevilacqua Also have a scan of a really old spoof British Standard for Garden Gnomes. There is still gold out there to be found!!
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@GustavinoBevilacqua this is the real life equivalent of self sealing stem bolts!
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@GustavinoBevilacqua this thing implies that there is a "screw or butt-plug" questionary somewhere.
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@GustavinoBevilacqua I could use a couple of those
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Yeah, some of them are smarter than they look.
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@GustavinoBevilacqua They get better and better!
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@GustavinoBevilacqua I have an unreasonable and frankly unfortunate desire to replicate this.
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@GustavinoBevilacqua I believe we use a few of these at work. :-)
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@GustavinoBevilacqua Tahnks to #3Dprinting it's now so much easier to make these :)
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@GustavinoBevilacqua my brother and his fellow apprentices once found a phillips screw with no thread which they promptly deposited in the material room, just so they could send first-years to fetch a phillips nail.
This inspired them to spend several days on the attempt of bending a screw into a 90° angle, just for pranking first-years with an "angle screw" :-D
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@GustavinoBevilacqua but of course! :-D
Apparently their teachers didn't object to their screw extravagazas because it was quite obvious that they were learning a lot in the process :-D
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After all, experience is just the sum of a long line of errors (the trick is to remember them, to make new ones).
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@GustavinoBevilacqua Also notice that it has not been counter sunk "too deep" but only "to deep".
So it is just right
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@n_dimension @GustavinoBevilacqua I thought, well I could have needed one of them in the past.
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@isocat @catsalad @GustavinoBevilacqua Almost! I was thinking that several of the photographed ones were very hard to cut but there's even more challenge in a couple of the diagrammed ones. The 20th century lathes that I learnt on weren't made for things like the "holes not square" thread nor the "all size tapers". But a 19th century or earlier lathe is more open to those sorts of turning, and so were the lathes of the 16th century when people did things like elliptical cross-sections for fun.
