When I was a child, I naively believed that with an endless supply of gears and screws, I could create everything in the world. This fascination with machinery is not unique to me, many children are drawn to the operation process of various mechanical devices, some even try to make them by themselves. However, making mechanical devices is not an easy task. In our app, we use a simple method to guide children to make some simple and interesting devices, helping them understand the operating principles of mechanical devices. In this app, children can gradually master the skills of making various interesting mechanical devices through imitation, practice, and free creation. We provide a large number of tutorials to help children understand the principles of pistons, connecting rods, cams, and gears. We hope that while children enjoy the fun of mechanical creation, they can also learn to make some basic mechanical devices. This app is suitable for children over 6 years old. Featur...