The spelling of the word "dead centers" can be explained using IPA phonetic transcription. The first syllable "dead" is pronounced as /dɛd/, with the "e" vowel sound being slightly open and short. The second syllable "cen" is pronounced as /sɛn/, with the "e" vowel sound being again slightly open and short. The final syllable "ters" is pronounced as /tərz/, with a short "e" vowel sound and the "r" being pronounced as a vowel-like sound, also called the schwa. Together, the word "dead centers" is pronounced as /dɛd ˈsɛn.tərz/.
Dead centers refer to the two support points used in the lathe machine. These points are present at either end of the machine's spindle where the workpiece is mounted. They are typically used in pairs, with one center acting as the fixed or stationary support, while the other center revolves with the workpiece being machined.
The first type of dead center is called the "live center" or "revolving center", which rotates along with the workpiece, providing support and reducing friction. It contains a set of bearings that allow the center to spin freely, providing better accuracy and control during machining operations.
The second type is known as the "fixed center" or "dead center". This center remains stationary while the workpiece rotates against it. It is designed to be a secure point of support for the workpiece, ensuring stability during machining. The fixed center often has a tapered point to facilitate easy insertion and alignment with the workpiece.
Both live and fixed centers are typically manufactured using high-quality hardened steel to withstand the pressures and forces exerted during machining. They are an essential tool in lathes and similar machines, as they provide the necessary support and stability required for accurate and precise turning operations.
Overall, dead centers play a crucial role in supporting workpieces during machining, allowing for reliable and efficient lathe operations.
The term "dead centers" originated in the field of machining and refers to specific types of tooling used in the machining process.
The word "center" in this context derives from the Latin word "centrum", which means "point" or "pivot". In machining, a center is a tool that serves as a pivot point for a rotating workpiece.
The adjective "dead" is used to distinguish these specific centers from other types of centers used in machining. A "dead center" refers to a type of center that remains stationary or fixed, as opposed to a "live center" which rotates with the workpiece. The term "dead center" is believed to have originated in the 19th century and has since become widely used in the machining industry.