Although I own and stock dozens of different types of screws, here are three screws ... meaning that its threads will cut into both what you are fastening and that to which you are fastening ...

Screw threads are another simple machine, and can be thought of as a long, gently sloped inclined plane wrapped around a cylinder. Cut a long right triangle out of paper, wrap it around a pencil ...

The guys from the YouTube channel How To Make Everything have been looking at one such sketch, a screw thread-cutting machine. At first glance, it seems a little flawed. Threads are hard to make ...