Programming the G71 Roughing Cycle on a CNC Lathe

September 6, 2019 10:39 am

The G71 roughing cycle is used for rough-material removal from a CNC lathe component.

It enables CNC machinists to remove material quickly on a CNC Lathe while also writing the cutter path as a subroutine that can be reused during the finishing cycle (G70).

In this video tutorial provided by Marc Cronin, senior CNC machine tools engineer and founder of, we take a look at the G71 line of G-Code and explain each part of the cycle in detail.



To learn more about the G71 roughing cycle, or to improve your G-code programming skills, visit

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