TAILIEUCHUNG - Common Mechanical Engineering Terms

The Department of Energy Fundamentals Handbook entitled Mechanical Science was prepared as an information resource for personnel who are responsible for the operation of the Department's nuclear facilities. Almost all processes that take place in the nuclear facilities involve the use of mechanical equipment and components. A basic understanding of mechanical science is necessary for DOE nuclear facility operators, maintenance personnel, and the technical staff to safely operate and maintain the facility and facility support systems. The information in the handbook is presented to provide a foundation for applying engineering concepts to the job. This knowledge will help personnel more fully understand the impact that their actions. | Common Mechanical Engineering Terms Ball and Detent n A simple mechanical arrangement used to hold a moving part in a temporarily fixed position relative to another part. The ball slides within a bored cylinder against the pressure of a spring which pushes the ball against the detent a hole of smaller diameter than the ball. When the hole is in line with the cylinder the ball falls partially into the hole under spring pressure holding the parts at that position. Additional force will push the ball back into its cylinder compressing the spring and allowing the parts to move. also shown detent pins Bearing ball roller and spherical shown n The part of a machine within which a rotating or sliding shaft is held. In some bearing types balls or rollers are used between the bearing surfaces to reduce rolling friction. Bell crank n A pivoting double lever used to change the direction of applied motion. Boss n A cylindrical projection as on a casting or a forging. Usually provides a contact surface around a hole. Broach v To finish the inside of a hole to a shape other than round as in a keyway n The tool for the process which has serrated edges and is pushed or pulled through the hole to produce the required shape. Burnish v To smooth or polish by a rolling or sliding tool under pressure. Bushing n A smooth walled bearing AKA a plain bearing . Also a tool guide in a jig or fixture. Cam n A mechanical device consisting of an eccentric or multiply curved wheel mounted on a rotating shaft used to produce variable or reciprocating motion in another engaged or contacted part cam follower . Also .

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