Comments by "Tony Wilson" (@tonywilson4713) on "Where DO screws come from?" video.

  1.  @johnasbury9915  That's the original Watt micrometer. Its scattered across several videos starting with the one on the "Origins of Precision" https://www.youtube.com/watch?v=gNRnrn5DE58 He actually made one here's part of the build -> https://www.youtube.com/watch?v=zVROA6UZxNg And did a whole video on it -> https://www.youtube.com/watch?v=1K_NQlmOwqM
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  2. Here's an argument what's more important to human history the screw or Vaucanson's metal lathe? Yeah I saw your video on Jacques de Vaucanson's incredible lathe, which is one of the most important engineering videos I have ever seen (I'm an aerospace engineer with a background in automation, robotics and control systems). It also completely refutes the ideology of Milton Freidman - the father of "greed is good." He famously claimed that greed alone drove innovation and that we needed to free up regulations to support greed and drive innovation. It was the justification and basis for his entire economic theory which became Reaganomics and Thatcherism, which has lead the world to its current financial catastrophe. As to your question on bolts & screws. You are essentially right, if its forms its own thread then its a screw, but then you have things like "set screws" which don't form their own threads and are essential to holding many things in place, like pulleys on shafts. But consider that the 2 words bolt and screw can both be used as verbs. You can "bolt things together" or "screw something down." Notably when you bolt things together you use nuts. So it might be possible to define things by purpose and if you use a nut its a bolt and if you don't its a screw. But then there are tings like shoulder bolts and if you use one in a fixture without a nut its still a shoulder bolt. After writing the above I checked Wikipedia starting with "bolt" (which include the word nut) and then got to this -> https://en.wikipedia.org/wiki/Screw#Differentiation_between_bolt_and_screw Note what it says about the naming of lag bolts and coach bolts which are clearly screws but been named bolts. 🤷‍♂️🤷‍♀️ As anyone can see going down that page the word bolt and nut keep being interchanged, so the definition is anything but clear. But in the most simplest case if it uses a nut to be tightened then its a bolt.
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