Introduction to Machine: Shaft and Keys

The document discusses basic mechanical engineering concepts related to shafts and keys. It defines shafts as rotating members that transmit power or motion and keys as elements used to secure rotating components and prevent relative motion. The document categorizes shafts as transmission or machine shafts and describes common shaft types like line and counter shafts. It also identifies various key types including sunk, square, and feather keys and explains their applications. Materials for shafts and keys are discussed. In summary, the document provides an introduction to shafts, keys, their classification and basic properties important for mechanical engineering.