Which command is used for incremental positioning?

The command for incremental positioning is G91. This command is essential in CNC programming as it allows the machine to interpret movement commands in relation to the current position rather than a fixed coordinate system. In incremental positioning, each movement command is a distance away from the last position of the tool, rather than to an absolute location. This can be particularly useful for making small adjustments and ensuring precise movements in a complex operation.

When G91 is used, each subsequent move is understood as an offset from the current location, simplifying the programming for specific machining scenarios, such as offsetting cuts or making corrections. Understanding how to utilize this command allows operators to create more efficient and responsive machining operations, enhancing overall production capabilities.

The other commands serve different purposes; G90 is for absolute positioning, G92 is used for setting a temporary coordinate system, and G93 is for inverse time feed rate, each of which does not support the incremental movement function that G91 provides.