David Chuang

The crankshaft is one of the most important parts in the engine. Its structural parameters and processing technology level not only affect the size and weight of the whole machine. They also greatly influence the reliability and lifespan of the…

The bore line of the gun barrel is a very important component in military firearms. It not only makes the bullet fly farther, but also makes it hit the target more accurately. After inventing it, humans entered a modern era…