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 ...

It explains the different types of screw threads, the importance of precision in machining, and outlines the four basic steps involved in thread cutting: setting up the work, making an undercut ...

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 ...