What is the command for metric positioning?

The command for metric positioning in CNC programming is G21. This command sets the machine to use metric units for all subsequent movements and dimensioning, allowing programmers to work in millimeters instead of inches. This is essential for ensuring precision and consistency when working with metric specifications, as it aligns the machine’s operations with the design requirements that may be based on metric measurements.

Using G21 eliminates the need to convert measurements from inches to millimeters, which can help reduce errors in production and streamline the machining process for parts that are designed using metric standards. This command is widely used in various CNC programming scenarios where parts are manufactured according to international standards or in regions where metric units are predominant.

The other choices do not represent the command for metric positioning, making G21 the essential command for those utilizing metric in their CNC operations.