外圆

wài yuán mó chuáng yán jiū

外圆磨床研究

research on external grinding machine

xué xí wài yuán chē xiāo

学习外圆车削

learn external cutting

xuán zhuǎn yuán hú gù dìng de wài yuán tóng xīn

旋转圆和固定的外圆同心。

The revolving circle is concentric with the fixed outer circle.