Taking the superfinishing of thin-wall hole machining as an example, the design and application of combined carbide core drill and reamer are introduced.
After many year development, industrial structure's adjustment, the region ground industry begins to take shape, the kleit precision work prospect favors.
A mill has existed on this site since the Middle Ages possibly for grinding grain but by the 15th century it was definitely a fulling mill, a crucial component in the wool industry.