The spindle journals must, to produce truly cylindrical work, be Cylindrically true, or otherwise the axis of its revolution will change as it revolves, and this change will be communicated through the live centre to the work, or through the chuck plate to the work, as the case may be.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
Its journals are hardened and ground Cylindrically true after the hardening.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
In place of a steel tool, a tool holder turned Cylindrically true and parallel may be used to carry a short boring tool, as shown in Fig.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose