Switching between Relative (gcode G91) and Absolute Coordinates (gcode G90) It’s just another way of saying the same thing. Note that what we might call “relative coordinates” are often called “incremental mode” coordinates in the CNC Controller Programming manuals. We’re used to both kinds in everyday life and both are useful depending on the situation. If instead he responds, “It’s three aisles down that way,” that’s an incremental coordinate. If he responds, “Go to Aisle 14 for the cookies,” that’s an absolute coordinate that is relative to the first aisle–the grocery store’s “part zero”. Suppose you’re in a grocery store and you ask the clerk which aisle the cookies are on.
The coordinates of the arc center as expressed by I and J are relative coordinates. We just looked at Circular Arc moves using G02 and G03. Relative moves are measured from the current position.
Absolute coordinates are measured from program zero, the program’s origin. What’s the Difference Between Absolute and Incremental Coordinate System?
Here’s the scoop: gcode G90 and gcode G91 tell your CNC machine whether to use absolute or incremental coordinates. Gcode G91 & Gcode G90: CNC Absolute and Incremental Programming
0 kommentar(er)
