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Two types of centres are used on the lathe to provide support to the material being machined. If a long piece of work is not supported it will bend away from the tool and not be machined correctly.
A dead centre will support the end of the work but doesn't move (hence 'dead') This is a simple solution but can overhead unless cooled.
A live centre spins with the work as it turns. The moving part is mounted on bearings which means there is very little friction and nothing will overheat.
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