Which code is used for an O.D. finish turning cycle in CNC?

The code used for an O.D. (Outside Diameter) finish turning cycle in CNC is B, which is G70. This code specifically instructs the CNC machine to carry out a finish turning operation on the external surface of a cylindrical workpiece.

In the context of CNC programming, G70 is part of the structured set of commands known as G-codes that control the motion of the machine during various operations. When G70 is executed, the machine applies the appropriate cutting parameters set in prior commands to achieve a fine finish on the part, promoting smoothness, precision, and the desired tolerances on the O.D.

The other codes mentioned serve different functions: G20 selects the unit of measurement to inches, G50 sets spindle speed limits or the maximum speed for the spindle, and G00 is a rapid positioning command used for moving the tool to a specified coordinate quickly without cutting. Understanding the specific purpose of each G-code is essential for accurate CNC programming and efficient machine operation.