noun
Engineering term for aligning a workpiece or tool to the center of a machine, such as a lathe or milling machine.
旋盤で加工する前に、ワークの芯出しをしっかり行う。
Before machining on the lathe, carefully center the workpiece.
芯出しが不十分だと、加工精度が落ちる。
If centering is insufficient, machining accuracy will decrease.
Compound of 芯 (しん, 'core, center') and 出し (だし, nominalized form of 出す 'to bring out'), literally 'bringing out the center'. The spelling 心出し uses a different kanji for 'center'.