G90 vs G91 - The Difference Between Absolute and Incremental Positioning

October 26, 2020 10:48 am

 

In this G-code tutorial, we go back to basics on a topic that often confuses programmers starting out with G-code programming: absolute vs incremental positioning.

When working in absolute mode, all the dimensions are calculated based on the distance from the datum position (X0;Y0;Z0) and the datum never moves. The G-code used to tell the machine to operate in absolute mode is G90.

When working in incremental mode on the other end, the dimensions are calculated based on the last know position of the tool. The G-code used to tell the machine to operate in incremental mode is G91.

To learn more about absolute and incremental positioning or expand your G-code knowledge visit Gcodetutor.com.

Stay tuned for more machining videos!

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