Lecture 5 | Program for Turning Operation by Using G90 Code | Box Turning |CNC Machining Programming
Dear all,
In this video lecture you will get the knowledge about the CNC Program for Turning Operation by Using G90 Code and the difference between code G01 and G90 in CNC Turning Machines.
About G90 Code: G90 turning cycle is used for simple turning however multiple passes are possible by specifying the X-axis location of additional passes.
G90 turning cycle can be used for
1. Straight turning.
2. Boring operation.
3. Taper cutting.
In CNC lathe machines, G90 cycle is used to perform rough cutting (straight cutting) operations in the Z axis direction. As with other cycles, the cycle continues automatically until it reaches the measurements determined by the parameters used with the command. Unlike similar turning cycles, the G90 cycle is used for single pass roughing, linear profiles and turning of simple shapes. It is not used for complex profiles and surfaces.
Do not confuse G90 for lathes with G90 for machining centers. In turning, G90 is a lathe cycle, G90 is the absolute mode in milling:
(a) G90 is absolute mode for milling, X and Z axes are absolute mode for turning
(b) G91 is incremental mode for milling, U and W axes are incremental mode for turning
A cycle identified by G90 preparatory command is called the Straight Cutting Cycle (Box cycle). Its purpose is to remove excessive stock between the cutter start position and the coordinates specified by the X and the Z axes. Resulting cut is a straight turning or boring cut, normally parallel to the spindle centerline, and the Z-axis is the main cutting axis. As the cycle name suggests, G90 cycle is used primarily for removing stock in a rectangular fashion (box shape). The G90 cycle can also be used for a taper cutting.
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