What G code is used for a finish turning cycle?

The G code used for a finish turning cycle is G70. This code is specifically designed for executing a finish cut in the turning process, which is essential for achieving high-quality surface finishes and precise dimensions on the turned part.

In CNC machining, G70 indicates a command for a finishing operation that follows a roughing cycle, typically performed with G68 or other roughing commands. The finishing operation takes the previously shaped workpiece and refines it to meet tighter tolerances and a smoother surface. Using G70 is crucial for processes where final detail and quality are vital, as it optimizes feed rates and cutting parameters for improved surface finish.

The other G codes mentioned serve different purposes: G01, for example, is used for linear interpolation, allowing the machine to move in a straight line at a specified feed rate; G96 is for constant surface speed control, which adjusts the spindle speed based on the diameter of the workpiece to maintain a consistent cutting speed; and G90 sets the machine to absolute positioning mode, determining how coordinates are interpreted but not specifically for finishing operations.

Understanding the specific application of G codes like G70 is vital for anyone involved in CNC machining, as it directly impacts the efficiency and quality of the machining process.